Log in

Relevant bibliographies by topics / Angular momentum (Nuclear physics) – Measurement / Journal articles

To see the other types of publications on this topic, follow the link: Angular momentum (Nuclear physics) – Measurement.

Journal articles on the topic 'Angular momentum (Nuclear physics) – Measurement'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Angular momentum (Nuclear physics) – Measurement.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Leader, Elliot. "A proposed measurement of optical orbital and spin angular momentum and its implications for photon angular momentum." Physics Letters B 779 (April 2018): 385–87. http://dx.doi.org/10.1016/j.physletb.2018.02.029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

STEINBRÜCK, GEORG. "MEASUREMENT OF THE ANGULAR DISTRIBUTION OF ELECTRONS FROM W→eν DECAYS OBSERVED IN $p\bar p$ COLLISIONS AT $\sqrt{s} =1.8\, {\rm TeV}$." International Journal of Modern Physics A 16, supp01a (October 2001): 318–21. http://dx.doi.org/10.1142/s0217751x01006802.

Full text

Abstract:

We present the first measurement of the electron angular distribution parameter α2 in W → e ν events in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ detector during the 1994–1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1 ± α1 cos θ* + α2 cos 2 θ*), where θ* is the polar angle of the electron in the Collins-Soper frame and α1 and α2 are functions of [Formula: see text], the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non-negligible contrbution to the W boson mass measurement.

APA, Harvard, Vancouver, ISO, and other styles

3

Qin, Huawang, and Raylin Tso. "High-capacity quantum secret sharing based on orbital angular momentum." Quantum Information and Computation 18, no. 7&8 (June 2018): 579–91. http://dx.doi.org/10.26421/qic18.7-8-3.

Full text

Abstract:

A high-capacity quantum secret sharing scheme based on orbital angular momentum is proposed. The dealer uses single particles in the orbital angular momentum (OAM) basis to bring the secret and encodes the secret through performing the transformation between the orbital angular momentum (OAM) basis and the angular position (ANG) basis. In the recovery, the participants perform the single-particle measurements to reconstruct the secret. The proposed scheme can use the multi-dimension of OAM to reach higher information capacity and enhanced security.

APA, Harvard, Vancouver, ISO, and other styles

4

Hwang, Dae Sung. "Deeply Virtual Compton Scattering in e- e- and e- γ Collisions." International Journal of Modern Physics A 18, no. 16 (June 30, 2003): 2787–96. http://dx.doi.org/10.1142/s0217751x03016252.

Full text

Abstract:

The matrix elements of the local operators such as electromagnetic current, energy momentum tensor, angular momentum, and generalized parton distributions have exact representations in terms of light-cone Fock state wavefunctions of bound states such as hadrons. We present formulae which express the form factors of the local operators in terms of the light-cone wavefunctions. We propose the measurement of the generalized parton distributions of the high energy real photon by the deeply virtual Compton scattering experiments.

APA, Harvard, Vancouver, ISO, and other styles

5

Al-Adili, A., A. Solders, and V. Rakopoulos. "Employing TALYS to deduce angular momentum rootmean-square values, Jrms, in fission fragments." EPJ Web of Conferences 239 (2020): 03019. http://dx.doi.org/10.1051/epjconf/202023903019.

Full text

Abstract:

Fission fragments exhibit large angular momenta J, which constitutes a challenge for fission models to fully explain. Systematic measurements of isomeric yield ratios (IYR) are needed for basic nuclear reaction physics and nuclear applications, especially as a function of mass number and excitation energy. One goal is to improve the current understanding of the angular momentum generation and sharing in the fission process. To do so, one needs to improve the modeling of nuclear de-excitation. In this work, we have used the TALYS nuclear-reaction code to relax excited fission fragments and to extract root-mean-square (rms) values of initial spin distributions, after comparison with experimentally determined IYRs. The method was assessed by a comparative study on 252Cf(sf) and 235U(nth,f). The results show a consistent performance of TALYS, both in comparison to reported literature values and to other fission codes. A few discrepant Jrms values were also found. The discrepant literature values could need a second consideration as they could possibly be caused by outdated models. Our TALYS method will be refined to better comply with contemporary sophisticated models and to reexamine older deduced values in literature.

APA, Harvard, Vancouver, ISO, and other styles

6

Markowitz, P., and A. Acha. "LOW Q2 KAON ELECTROPRODUCTION." International Journal of Modern Physics E 19, no. 12 (December 2010): 2383–86. http://dx.doi.org/10.1142/s0218301310016843.

Full text

Abstract:

A measurement of the H(e, e′ K+) reaction was performed at Hall A, TJNAF as part of the hypernuclear experiment E94-107. Data was taken at very low Q2 (~ 0.07 ( GeV /c)2) and W = 2.2 GeV . Kaons were detected along the direction of [Formula: see text], the momentum transferred by the incident electron (θCM = 6°). These measurements provide data about the Σ0/Λ ratio which drops rapidly with Q2, the angular dependence of the cross sections as Q2 → 0, and the dependence of the cross section with respect to Q2 ,W and θCM. The dependence of the cross section at very forward angles has been poorly known. Available models are inadequate to describe the results. The measurement of the elementary cross section will constrain models for the elementary reaction which are inadequate to describe these results. It is also a key ingredient in the hypernuclear spectroscopy studies performed at the same kinematics. Details of the calculations and results will be shown.

APA, Harvard, Vancouver, ISO, and other styles

7

Becattini, Francesco, and Michael A. Lisa. "Polarization and Vorticity in the Quark–Gluon Plasma." Annual Review of Nuclear and Particle Science 70, no. 1 (October 19, 2020): 395–423. http://dx.doi.org/10.1146/annurev-nucl-021920-095245.

Full text

Abstract:

The quark–gluon plasma (QGP) produced by collisions between ultrarelativistic heavy nuclei is well described in the language of hydrodynamics. Noncentral collisions are characterized by very large angular momentum, which in a fluid system manifests as flow vorticity. This rotational structure can lead to a spin polarization of the hadrons that eventually emerge from the plasma, and thus these collisions provide experimental access to flow substructure at unprecedented detail. Recently, the first observations of Λ hyperon polarization along the direction of collisional angular momentum were reported. These measurements are in broad agreement with hydrodynamic and transport-based calculations and reveal that the QGP is the most vortical fluid ever observed. However, there remain important tensions between theory and observation that might be fundamental in nature. In the relatively mature field of heavy-ion physics, the discovery of global hyperon polarization and 3D simulations of the collision have opened an entirely new direction of research. We discuss the current status of this rapidly developing area and directions for future research.

APA, Harvard, Vancouver, ISO, and other styles

8

Kunnawalkam Elayavalli, Raghav. "Constraining parton energy loss via angular and momentum based differential jet measurements at STAR." Nuclear Physics A 1005 (January 2021): 121879. http://dx.doi.org/10.1016/j.nuclphysa.2020.121879.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

SUN, X. Y., J. G. CHEN, D. Q. FANG, Y. G. MA, X. Z. CAI, W. GUO, W. D. TIAN, et al. "MEASUREMENT OF THE PROTON-PROTON CORRELATION FUNCTION FROM THE BREAK-UP OF 22Mg AND 20Ne." International Journal of Modern Physics E 19, no. 08n09 (September 2010): 1823–28. http://dx.doi.org/10.1142/s0218301310016259.

Full text

Abstract:

An experiment of 22 Mg and 20 Ne beams bombarding on a 12 C target at an energy of 60~70 A MeV has been performed at the RIKEN projectile fragment separator (RIPS) in the RIKEN Ring Cyclotron Facility to study the two-proton correlated emission from 22 Mg and 20 Ne excited states. The two-protons momentum correlation functions have been obtained for 22 Mg and 20 Ne , respectively. The trajectories of the 22 Mg decayed products (20 Ne + p + p ) were also measured to get the angular correlations between the two protons in Center of Mass of decaying system by relativistic-kinematics reconstruction. The results exhibit that 22 Mg has the features of 2 He cluster decay mechanism.

APA, Harvard, Vancouver, ISO, and other styles

10

Mocuta, Cristian, Stefan Stanescu, Manon Gallard, Antoine Barbier, Arkadiusz Dawiec, Bouzid Kedjar, Nicolas Leclercq, and Dominique Thiaudiere. "Fast X-ray reflectivity measurements using an X-ray pixel area detector at the DiffAbs beamline, Synchrotron SOLEIL." Journal of Synchrotron Radiation 25, no. 1 (January 1, 2018): 204–13. http://dx.doi.org/10.1107/s1600577517015703.

Full text

Abstract:

This paper describes a method for rapid measurements of the specular X-ray reflectivity signal using an area detector and a monochromatic, well collimated X-ray beam (divergence below 0.01°), combined with a continuous data acquisition mode during the angular movements of the sample and detector. In addition to the total integrated (and background-corrected) reflectivity signal, this approach yields a three-dimensional mapping of the reciprocal space in the vicinity of its origin. Grazing-incidence small-angle scattering signals are recorded simultaneously. Measurements up to high momentum transfer values (close to 0.1 nm−1, also depending on the X-ray beam energy) can be performed in total time ranges as short as 10 s. The measurement time can be reduced by up to 100 times as compared with the classical method using monochromatic X-ray beams, a point detector and rocking scans (integrated reflectivity signal).

APA, Harvard, Vancouver, ISO, and other styles

11

Abazov, V. M., B. Abbott, B. S. Acharya, M. Adams, T. Adams, G. D. Alexeev, G. Alkhazov, et al. "Measurement of angular correlations of jets at s=1.96 TeV and determination of the strong coupling at high momentum transfers." Physics Letters B 718, no. 1 (November 2012): 56–63. http://dx.doi.org/10.1016/j.physletb.2012.10.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Aaboud, M., G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, R. Aben, et al. "Measurement of W boson angular distributions in events with high transverse momentum jets at s=8 TeV using the ATLAS detector." Physics Letters B 765 (February 2017): 132–53. http://dx.doi.org/10.1016/j.physletb.2016.12.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

TAKECHI, M., T. OHTSUBO, T. KUBOKI, M. FUKUDA, D. NISHIMURA, T. SUZUKI, T. YAMAGUCHI, et al. "MEASUREMENTS OF INTERACTION CROSS SECTIONS TOWARDS NEUTRON-RICH Ne ISOTOPES AT RIBF." Modern Physics Letters A 25, no. 21n23 (July 30, 2010): 1878–81. http://dx.doi.org/10.1142/s021773231000054x.

Full text

Abstract:

Interaction cross sections (σI) for Ne isotopes from the stability line to the vicinity of neutron-drip line have been measured using the RIBF facility at RIKEN. Measurements have been performed for 20–32 Ne on C target at energies around 240 MeV/nucleon. A large enhancement of σI beyond the systematics of stable nuclei have been observed for neutron-rich Ne isotopes. The possible halo structures with lower orbital angular momentum for 29,31 Ne are discussed by the preliminary analysis.

APA, Harvard, Vancouver, ISO, and other styles

14

Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. "Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ⁎ boson transverse momentum at s=7 TeV with the ATLAS detector." Physics Letters B 720, no. 1-3 (March 2013): 32–51. http://dx.doi.org/10.1016/j.physletb.2013.01.054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Strocov, V. N., X. Wang, M. Shi, M. Kobayashi, J. Krempasky, C. Hess, T. Schmitt, and L. Patthey. "Soft-X-ray ARPES facility at the ADRESS beamline of the SLS: concepts, technical realisation and scientific applications." Journal of Synchrotron Radiation 21, no. 1 (November 7, 2013): 32–44. http://dx.doi.org/10.1107/s1600577513019085.

Full text

Abstract:

Soft-X-ray angle-resolved photoelectron spectroscopy (ARPES) with photon energies around 1 keV combines the momentum space resolution with increasing probing depth. The concepts and technical realisation of the new soft-X-ray ARPES endstation at the ADRESS beamline of SLS are described. The experimental geometry of the endstation is characterized by grazing X-ray incidence on the sample to increase the photoyield and vertical orientation of the measurement plane. The vacuum chambers adopt a radial layout allowing most efficient sample transfer. High accuracy of the angular resolution is ensured by alignment strategies focused on precise matching of the X-ray beam and optical axis of the analyzer. The high photon flux of up to 1013 photons s−1(0.01% bandwidth)−1delivered by the beamline combined with the optimized experimental geometry break through the dramatic loss of the valence band photoexcitation cross section at soft-X-ray energies. ARPES images with energy resolution up to a few tens of meV are typically acquired on the time scale of minutes. A few application examples illustrate the power of our advanced soft-X-ray ARPES instrumentation to explore the electronic structure of bulk crystals with resolution in three-dimensional momentum, access buried heterostructures and study elemental composition of the valence states using resonant excitation.

APA, Harvard, Vancouver, ISO, and other styles

16

JANEK, M., T. SAITO, V. P. LADYGIN, M. HATANO, A. YU. ISUPOV, H. KATO, N. B. LADYGINA, et al. "MEASUREMENTS OF THE TENSOR AND VECTOR ANALYZING POWERS FOR THE d+d→3H+p AND d+d→3He+n REACTIONS AT 270 MeV." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 646–48. http://dx.doi.org/10.1142/s0217751x05022044.

Full text

Abstract:

The experiment with polarized deuteron beam was performed at energies 140, 200 and 270 MeV at RIKEN, Japan, in December 2000. The high-momentum structure of the 3 He , 3 H and deuteron was investigated. For this purpose the angular dependence of the tensor and vector analyzing powers were measured for the reactions d + d →3 H + p and d + d →3 He + n . In this report the results on the tensor Axx, Ayy and vector Ay analyzing powers at 270 MeV are presented.

APA, Harvard, Vancouver, ISO, and other styles

17

Puri, Akshat. "Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at sNN=5.02TeV with ATLAS at the LHC." Nuclear Physics A 982 (February 2019): 177–79. http://dx.doi.org/10.1016/j.nuclphysa.2018.09.021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

OSMAN, AHMED, and A. A. FARRA. "CONTRIBUTION OF THE PARITY DEPENDENT POTENTIAL IN HEAVY ION TRANSFER REACTIONS." International Journal of Modern Physics E 03, no. 01 (March 1994): 219–38. http://dx.doi.org/10.1142/s0218301394000097.

Full text

Abstract:

The theory of heavy ion reactions with particle transfer is considered in the framework of the exact finite-range distorted wave Born approximation (EFR-DWBA). Modified Woods-Saxon potentials which include a parity dependent interaction and an angular momentum absorptive term have been used as the ion-ion interactions in the initial and final channels. The bound state interactions are represented by nucleus-nucleus inter-actions which include repulsive and attractive Yukawa type components. The present numerical calculations of the differential cross-sections are in good agreement with the experimental measurements. The distorting parity dependent potentials are found very important in reproducing the cross-sections at backward as well as at intermediate angles. The obtained extracted values of the spectroscopic factors are reasonable.

APA, Harvard, Vancouver, ISO, and other styles

19

Zhao, Hua, and Hongpu Li. "Advances on Mode-Coupling Theories, Fabrication Techniques, and Applications of the Helical Long-Period Fiber Gratings: A Review." Photonics 8, no. 4 (April 6, 2021): 106. http://dx.doi.org/10.3390/photonics8040106.

Full text

Abstract:

In this paper, we have briefly review the developing history and recent advances made with regard to helical long-period fiber gratings (HLPGs) in three aspects, i.e., the mode-coupling theories, the fabrication techniques, and the applications. It is shown that, due to the intrinsic helicity characteristics, which are especially suitable to control the loss, polarization, and orbit-angular-momentum (OAM) states of the light in optical fiber, HLPGs have recently attracted great research interest and have found various applications, such as the mode-converters, the torsion sensors, the band-rejection filters, wave plates, linear- and circular-light polarizers, and OAM mode generators, etc. It is believed that HLPGs and the HLPGs-based devices would find further applications to not only the fields of optical sensors and optical communication, but also other fields such as ultrahigh precision measurement, quantum optics, and biochemistry, etc.

APA, Harvard, Vancouver, ISO, and other styles

20

Mohammed, Muhsin, and Aleksander Gajos. "The tests of CP and CPT symmetry using the J-PET detector." EPJ Web of Conferences 199 (2019): 05027. http://dx.doi.org/10.1051/epjconf/201919905027.

Full text

Abstract:

Symmetries under the parity transformation (P), charge-conjugation (C) and time reversal (T) are of fundamental importance in nuclear and elementary particle physics. Studies of the observables violating the combined CP symmetry constitute precise tests of the Standard Model. However, CP violation was observed to date only for systems involving quarks, raising the importance of searches its manifestations e.g. in purely leptonic systems. The 3γ decay of spin-aligned ortho-positronium atoms (o-Ps) can be used to test CP invariance in such a purely leptonic system. The Jagiellonian Positron Emission Tomograph (J-PET) detection system enables experimental tests of CP and CPT through measurement of the expectation values of angular correlation operators odd under these transformations and constructed from (i) spin vector of the ortho-positronium atom, (ii) co-planar momentum vectors of photons originating from the decay of the positronium atom, and (iii) linear polarization direction of annihilation photons. Precise experimental symmetry tests with J-PET are possible thanks to a dedicated reconstruction technique of 3γ ortho-positronium decays and a positronium production chamber including a highly porous aerogel target, whose setup allows for determining the orthopositronium spin polarization without the use of an external magnetic field.

APA, Harvard, Vancouver, ISO, and other styles

21

NEFF, THOMAS, and HANS FELDMEIER. "CLUSTER AND SHELL STRUCTURES IN THE FERMIONIC MOLECULAR DYNAMICS APPROACH." International Journal of Modern Physics E 17, no. 10 (November 2008): 2005–13. http://dx.doi.org/10.1142/s0218301308010994.

Full text

Abstract:

Nuclei in the p- and sd-shell are studied within the Fermionic Molecular Dynamics (FMD) model that uses Gaussian wave packets as single-particle states. Intrinsic many-body basis states are given by Slater determinants which have to be projected on parity, angular momentum and total linear momentum to restore the symmetries of the Hamiltonian. The flexibility of the Gaussian basis allows to economically describe states with shell structures as well as states featuring clustering or halos. The same effective interaction derived from the realistic Argonne V18 interaction in the Unitary Correlation Operator Method (UCOM) framework is used for all nuclei. We discuss the spectrum of 12 C with a special emphasis on the structure of the first excited 0+ state, the famous Hoyle state. In the FMD approach the Hoyle state is found to be dominated by dilute α-cluster configurations. Recent measurements of the charge radii of Neon isotopes show an intriguing behaviour. This can be explained in FMD calculations by a structure change from 17 Ne and 18 Ne which can be essentially considered as an 15 O or 16 O core plus two protons in s2 or d2 configurations, respectively. For the heavier isotopes we find that the admixture of 3 He and 4 He cluster configurations in the ground states leads to much larger charge radii than obtained in a mean-field calculation.

APA, Harvard, Vancouver, ISO, and other styles

22

Bezerra, V. B., M. S. Cunha, L. F. F. Freitas, C. R. Muniz, and M. O. Tahim. "Casimir effect in the Kerr spacetime with quintessence." Modern Physics Letters A 32, no. 01 (December 15, 2016): 1750005. http://dx.doi.org/10.1142/s0217732317500055.

Full text

Abstract:

We calculate the Casimir energy of a massless scalar field in a cavity formed by nearby parallel plates orbiting a rotating spherical body surrounded by quintessence, investigating the influence of the gravitational field on that energy, at zero temperature. This influence includes the effects due to the spacetime dragging caused by the source rotation as well as those ones due to the quintessence. We show that the energy depends on all the involved parameters, as source mass, angular momentum and quintessence state parameter, for any radial coordinate and polar angle. We show that at the north pole the Casimir energy is not influenced by the quintessential matter. At the equatorial plane, when the quintessence is canceled, the result obtained in the literature is recovered. Finally, constraints in the quintessence parameters are obtained from the uncertainty in the current measurements of Casimir effect.

APA, Harvard, Vancouver, ISO, and other styles

23

SAXENA, G., D. SINGH, H. L. YADAV, A. HAGA, and H. TOKI. "WEAKLY BOUND STRUCTURES, HALOS AND MAGICITY IN NEUTRON RICH NUCLEI." Modern Physics Letters A 23, no. 27n30 (September 30, 2008): 2589–92. http://dx.doi.org/10.1142/s0217732308029861.

Full text

Abstract:

Inspired by recent measurements indicating proton magic number at Z =14 in the vicinity of 42 Si , we have employed our relativistic mean-field (RMF) plus state dependent BCS approach for the study of even-even nuclei to obtain magic numbers and to look for nuclei exhibiting weakly bound structures and even halo formation. In our RMF+BCS approach the single particle continuum corresponding to the RMF is replaced by a set of discrete positive energy states for the calculations of pairing energy. It is found that in several nuclei the filling in of low lying single particle resonant state with large angular momentum, even before it becomes a bound state, helps to accommodate more neutrons but with extremely small increase in the binding energy. This gives rise to the occurrence of weakly bound system of neutron rich nuclei.

APA, Harvard, Vancouver, ISO, and other styles

24

GOUNARIS, G., F. M. RENARD, and D. SCHILDKNECHT. "UNITARITY BOUNDS ON WW SCATTERING AND ELECTROWEAK TESTS AT LEP." Modern Physics Letters A 08, no. 07 (March 7, 1993): 647–60. http://dx.doi.org/10.1142/s0217732393000672.

Full text

Abstract:

Replacing elementary Higgs exchange in vector-boson scattering by an angular-momentum-zero unitarity-saturating partial wave amplitude described by a dispersion relation which incorporates low-energy gauge theory and high-energy partial-wave unitarity constraints, we find an upper bound of Λ≲Λmax≅0.8 TeV for the scale, Λ, at which saturation of partial wave unitarity is to occur. Upon inserting the partial wave amplitude into a novel integral representation for the bosonic vacuum polarization contribution to the electroweak ρ parameter, Δρb, we establish an upper bound on −Δρb(≲0.033), while for the case of the elementary Higgs scalar, the integral representation reproduces the well known ln mH/mW formula for Δρb. The upper bound on −Δρb implies that the value of the mass of the top quark extracted from LEP1 measurements becomes justified even in the case when the Higgs scalar is replaced by a strong-interaction-like J=0 partial wave.

APA, Harvard, Vancouver, ISO, and other styles

25

BRODSKY, STANLEY J. "HIGH ENERGY PHOTON–PHOTON COLLISIONS AT A LINEAR COLLIDER." International Journal of Modern Physics A 20, no. 31 (December 20, 2005): 7306–32. http://dx.doi.org/10.1142/s0217751x05031137.

Full text

Abstract:

High intensity back-scattered laser beams will allow the efficient conversion of a substantial fraction of the incident lepton energy into high energy photons, thus significantly extending the physics capabilities of an e-e± linear collider. The annihilation of two photons produces C = + final states in virtually all angular momentum states. An important physics measurement is the measurement of the Higgs coupling to two photons. The annihilation of polarized photons into the Higgs boson determines its fundamental H0γγ coupling as well as determining its parity. Other novel two-photon processes include the two-photon production of charged pairs τ+τ-, W+W-, [Formula: see text], and supersymmetric squark and slepton pairs. The one-loop box diagram leads to the production of pairs of neutral particles such as γγ → Z0Z0, γZ0, and γγ. At the next order one can study Higgstrahlung processes, such as γγ → W+W-W-H. Since each photon can be resolved into a W+W- pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying possibly anomalous WW collisions and annihilation. In the case of QCD, each photon can materialize as a quark anti-quark pair which interact via multiple gluon exchange. The diffractive channels in photon-photon collisions allow a novel look at the QCD pomeron and odderon. The C = - odderon exchange contribution can be identified by looking at the heavy quark asymmetry. In the case of eγ → e′ collisions, one can measure the photon structure functions and its various components. Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes which are also important for the analysis of exclusive semi-leptonic and two-body hadronic B-decays.

APA, Harvard, Vancouver, ISO, and other styles

26

BRODSKY, STANLEY J., DAE SUNG HWANG, and IVAN SCHMIDT. "FINAL-STATE INTERACTIONS AND SINGLE-SPIN ASYMMETRIES IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING." International Journal of Modern Physics A 18, no. 08 (March 30, 2003): 1327–34. http://dx.doi.org/10.1142/s0217751x03014678.

Full text

Abstract:

Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion leptoproduction γ*(q) p → π X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q2 at fixed xbj. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with [Formula: see text] to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum Lz of the proton's constituents and thus is distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of structure function and fragmentation function, and it is not related to the transversity distribution δq(x,Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon.

APA, Harvard, Vancouver, ISO, and other styles

27

Townsend, Paul K. "Surprises with Angular Momentum." Annales Henri Poincaré 4, S1 (December 2003): 183–95. http://dx.doi.org/10.1007/s00023-003-0915-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Tartaglia, A., and M. L. Ruggiero. "Gravitomagnetic Measurement of the Angular Momentum of Celestial Bodies." General Relativity and Gravitation 36, no. 2 (February 2004): 293–301. http://dx.doi.org/10.1023/b:gerg.0000010476.58203.b6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Kotlyar, V. V., A. A. Kovalev, and A. P. Porfirev. "Measurement of the orbital angular momentum of an astigmatic Hermite–Gaussian beam." Computer Optics 43, no. 3 (June 2019): 356–67. http://dx.doi.org/10.18287/2412-6179-2019-43-3-356-367.

Full text

Abstract:

Here we study three different types of astigmatic Gaussian beams, whose complex amplitude in the Fresnel diffraction zone is described by the complex argument Hermite polynomial of the order (n, 0). The first type is a circularly symmetric Gaussian optical vortex with and a topological charge n after passing through a cylindrical lens. On propagation, the optical vortex "splits" into n first-order optical vortices. Its orbital angular momentum per photon is equal to n. The second type is an elliptical Gaussian optical vortex with a topological charge n after passing through a cylindrical lens. With a special choice of the ellipticity degree (1: 3), such a beam retains its structure upon propagation and the degenerate intensity null on the optical axis does not “split” into n optical vortices. Such a beam has fractional orbital angular momentum not equal to n. The third type is the astigmatic Hermite-Gaussian beam (HG) of order (n, 0), which is generated when a HG beam passes through a cylindrical lens. The cylindrical lens brings the orbital angular momentum into the original HG beam. The orbital angular momentum of such a beam is the sum of the vortex and astigmatic components, and can reach large values (tens and hundreds of thousands per photon). Under certain conditions, the zero intensity lines of the HG beam "merge" into an n-fold degenerate intensity null on the optical axis, and the orbital angular momentum of such a beam is equal to n. Using intensity distributions of the astigmatic HG beam in foci of two cylindrical lenses, we calculate the normalized orbital angular momentum which differs only by 7 % from its theoretical orbital angular momentum value (experimental orbital angular momentum is –13,62, theoretical OAM is –14.76).

APA, Harvard, Vancouver, ISO, and other styles

30

DANG, N. DINH, and N. QUANG HUNG. "NUCLEAR PAIRING AT FINITE TEMPERATURE AND ANGULAR MOMENTUM." International Journal of Modern Physics E 17, no. 10 (November 2008): 2160–64. http://dx.doi.org/10.1142/s0218301308011276.

Full text

Abstract:

An approach is proposed to nuclear pairing at finite temperature and angular momentum, which includes the effects of the quasiparticle-number fluctuation and dynamic coupling to pair vibrations within the self-consistent quasiparticle random-phase approximation. The numerical calculations of pairing gaps, total energies, and heat capacities are carried out within a doubly folded multilevel model as well as several realistic nuclei. The results obtained show that, in the region of moderate and strong couplings, the sharp transition between the superconducting and normal phases is smoothed out, causing a thermal pairing gap, which does not collapse at a critical temperature predicted by the conventional Bardeen-Cooper-Schrieffer's (BCS) theory, but has a tail extended to high temperatures. The theory also predicts the appearance of a thermally assisted pairing in hot rotating nuclei.

APA, Harvard, Vancouver, ISO, and other styles

31

Kargar, Z., and R. Najimi Gashtaseb. "Nuclear pairing fluctuations and angular momentum dependence of superconductivity in 94Mo nucleus." International Journal of Modern Physics E 27, no. 11 (November 2018): 1850096. http://dx.doi.org/10.1142/s0218301318500969.

Full text

Abstract:

The effects of thermal fluctuations on pairing properties of nuclei with inclusion of angular momentum have been investigated. To treat nuclei at finite temperature and angular momentum, we have extended the formalism in which the mean value of the gap parameter is used to obtain thermal properties of nuclei based on the BCS scheme [Z. Kargar and V. Dehghani, J. Phys. G, Nucl. Part. Phys. 40 (2013) 045108] let us name it MEGBCS. The results obtained for [Formula: see text] nucleus show the appearance of thermally assisted pairing correlations with increasing angular momentum. Also, the [Formula: see text]-shaped heat capacity found experimentally [K. Kaneko et al., Phys. Rev. C 74 (2006) 024325] and theoretically, interpreted as the second phase transition in mesoscopic systems, disappears with increasing angular momentum above a critical value. The nuclear level density of [Formula: see text] is calculated versus excitation energy at various values of total angular momentum. The total level density matches the experimental data closely.

APA, Harvard, Vancouver, ISO, and other styles

32

Behkami, A. N., M. Gholami, M. Kildir, and M. Soltani. "Nuclear Level Density with Non-zero Angular Momentum." Communications in Theoretical Physics 46, no. 3 (September 2006): 514–20. http://dx.doi.org/10.1088/0253-6102/46/3/022.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Burkardt, Matthias. "Transversity decomposition of quark angular momentum." Physics Letters B 639, no. 5 (August 2006): 462–64. http://dx.doi.org/10.1016/j.physletb.2006.01.076.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Pal, Subrata, and Rudrajyoti Palit. "Angular momentum population in fragmentation reactions." Physics Letters B 665, no. 4 (July 2008): 164–67. http://dx.doi.org/10.1016/j.physletb.2008.06.040.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Sunko, D. K., and D. Svrtan. "Generating function for angular momentum multiplicities." Physical Review C 31, no. 5 (May 1, 1985): 1929–33. http://dx.doi.org/10.1103/physrevc.31.1929.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Nolan, P. J., and P. J. Twin. "Superdeformed Shapes at High Angular Momentum." Annual Review of Nuclear and Particle Science 38, no. 1 (December 1988): 533–62. http://dx.doi.org/10.1146/annurev.ns.38.120188.002533.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Zhang, Zijing, Tianyuan Qiao, Kun Ma, Longzhu Cen, Jiandong Zhang, Feng Wang, and Yuan Zhao. "Ultra-sensitive and super-resolving angular rotation measurement based on photon orbital angular momentum using parity measurement." Optics Letters 41, no. 16 (August 11, 2016): 3856. http://dx.doi.org/10.1364/ol.41.003856.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Xiao, S. F., and Q. H. Liu. "Geometric momentum and angular momentum for charge-monopole system." Modern Physics Letters A 33, no. 23 (July 29, 2018): 1850125. http://dx.doi.org/10.1142/s0217732318501250.

Full text

Abstract:

For a charge-monopole pair, we have another definition of the orbital angular momentum, and the transverse part of the momentum including the vector potential turns out to be the so-called geometric momentum that is under intensive study recently. For the charge on the spherical surface with the monopole at the origin, the commutation relations between all components of both the geometric momentum and the orbital angular momentum satisfy the so(3,[Formula: see text]1) algebra. With construction of the geometrically infinitesimal displacement operator based on the geometric momentum, the so(3,[Formula: see text]1) algebra implies the Aharonov–Bohm phase shift. The related problems such as charge and flux quantization are also addressed.

APA, Harvard, Vancouver, ISO, and other styles

39

Fu, Shiyao, Shikun Zhang, Tonglu Wang, and Chunqing Gao. "Measurement of orbital angular momentum spectra of multiplexing optical vortices." Optics Express 24, no. 6 (March 11, 2016): 6240. http://dx.doi.org/10.1364/oe.24.006240.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Chen, Yuanyuan, Dong Jiang, Xuemei Gu, Ling Xie, and Lijun Chen. "Interaction-free generation of orbital angular momentum entanglement." International Journal of Modern Physics B 30, no. 05 (February 20, 2016): 1650006. http://dx.doi.org/10.1142/s0217979216500065.

Full text

Abstract:

Due to the infinite range of possibly achievable degrees of freedom, orbital angular momentum (OAM) can tremendously increase the capacity of communication system. Here, we propose a scheme to generate OAM entanglement by using interaction-free measurement (IFM). As the superposition state of the quantum absorption object is not changed after IFM, our scheme can be extended to multiparty easily. The numerical analysis results show that the fidelity of generated OAM entanglement can be arbitrarily close to unity. Besides, the implementation issues are also discussed to evaluate the feasibility in experiment. This OAM entanglement with multiple degrees of freedom will play a key role in distributed entanglement computing and efficient quantum communication.

APA, Harvard, Vancouver, ISO, and other styles

41

Frampton, Paul H. "Angular momentum of dark matter black holes." Physics Letters B 767 (April 2017): 303–6. http://dx.doi.org/10.1016/j.physletb.2017.02.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Vandenbosch, R. "Angular Momentum Distributions in Subbarrier Fusion Reactions." Annual Review of Nuclear and Particle Science 42, no. 1 (December 1992): 447–81. http://dx.doi.org/10.1146/annurev.ns.42.120192.002311.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Johnson, Calvin W., and Changfeng Jiao. "Convergence and efficiency of angular momentum projection." Journal of Physics G: Nuclear and Particle Physics 46, no. 1 (November 20, 2018): 015101. http://dx.doi.org/10.1088/1361-6471/aaee20.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

GUPTA, RAJ K., SHAM S. MALIK, J. S. BATRA, PETER O. HESS, and WERNER SCHEID. "PHENOMENOLOGY OF NUCLEI AT VERY HIGH ANGULAR MOMENTA USING PARAMETRIZED TWO-CENTER NUCLEAR SHAPES." International Journal of Modern Physics E 04, no. 04 (December 1995): 789–800. http://dx.doi.org/10.1142/s0218301395000262.

Full text

Abstract:

The nuclear shapes and variation of moment of inertia with angular momentum, as well as the limiting angular momentum carried by a nucleus at its fissioning stage, are derived from the observed data of the ground-state yrast band and quadrupole deformations of these states. The necking-in of the nuclear shapes are shown to start already at J*~14+−18+. The empirical variation of moment of inertia with angular momentum is found to include the back-bending and forward-bending effects and supports the nuclear softness model of the nucleus. The fission of nuclei is shown to occur at very high angular momenta, which is different for different nuclei. The role of deformation energy is analyzed and the possibility of predicting the quadrupole deformations, or B(E2) transitions, for very high spin states is discussed. The calculations are presented for 156Dy, 158Er, and 164Hf.

APA, Harvard, Vancouver, ISO, and other styles

45

Parkin, Simon, Gregor Knöner, Timo A. Nieminen, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop. "Measurement of the total optical angular momentum transfer in optical tweezers." Optics Express 14, no. 15 (2006): 6963. http://dx.doi.org/10.1364/oe.14.006963.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Ryabtsev, A., S. Pouya, A. Safaripour, M. Koochesfahani, and M. Dantus. "Fluid flow vorticity measurement using laser beams with orbital angular momentum." Optics Express 24, no. 11 (May 20, 2016): 11762. http://dx.doi.org/10.1364/oe.24.011762.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Di Lorenzo Pires, H., J. Woudenberg, and M. P. van Exter. "Measurement of the orbital angular momentum spectrum of partially coherent beams." Optics Letters 35, no. 6 (March 15, 2010): 889. http://dx.doi.org/10.1364/ol.35.000889.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Bros, Jacques, Enrico De Micheli, and Giovanni Alberto Viano. "Nonlocal Potentials and Complex Angular Momentum Theory." Annales Henri Poincaré 11, no. 4 (July 10, 2010): 659–764. http://dx.doi.org/10.1007/s00023-010-0041-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

GU, XIAO-YAN, BIN DUAN, and ZHONG-QI MA. "SEPARATION OF ROTATIONAL DEGREES OF FREEDOM IN A QUANTUM THREE-BODY PROBLEM." International Journal of Modern Physics E 10, no. 01 (February 2001): 69–82. http://dx.doi.org/10.1142/s0218301301000411.

Full text

Abstract:

We demonstrate explicitly how the rotational degrees of freedom in a quantum three-body problem is separated completely from the internal ones. It is shown that only finite partial angular momentum states are involved in constructing the base-functions with the given angular momentum and parity, and the contributions by the remaining partial angular momentum states are incorporated into the contributions by the generalized radial functions.

APA, Harvard, Vancouver, ISO, and other styles

50

NASIROV, AVAZBEK, GIORGIO GIARDINA, GIUSEPPE MANDAGLIO, MARINA MANGANARO, and AKHTAM MUMINOV. "MECHANISMS PRODUCING FISSIONLIKE BINARY FRAGMENTS IN HEAVY ION COLLISIONS." International Journal of Modern Physics E 19, no. 05n06 (June 2010): 997–1008. http://dx.doi.org/10.1142/s0218301310015448.

Full text

Abstract:

The mixing of the quasifission component to the fissionlike cross section causes ambiguity in the quantitative estimation of the complete fusion cross section from the observed angular and mass distributions of the binary products. We show that the partial cross section of quasifission component of binary fragments covers the whole range of the angular momentum values leading to capture. The calculated angular momentum distributions for the compound nucleus and dinuclear system going to quasifission may overlap: competition between complete fusion and quasifission takes place at all values of initial orbital angular momentum. Quasifission components formed at large angular momentum of the dinuclear system can show isotropic angular distribution and their mass distribution can be in mass symmetric region similar to the characteristics of fusion-fission components. As result the unintentional inclusion of the quasifission contribution into the fusion-fission fragment yields can lead to overestimation of the probability of the compound nucleus formation.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!