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Journal articles on the topic 'IsoSPI'

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Published: 23 June 2021
Last updated: 29 July 2025

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1

YE, W. "INFLUENCE OF ISOSPIN ON PRESCISSION PARTICLE EMISSION OF LIGHT FISSIONING SYSTEMS." International Journal of Modern Physics E 12, no. 06 (2003): 817–26. http://dx.doi.org/10.1142/s0218301303001600.

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The isospin effect on particle emission for fissioning isobaric sources of 110Tc, 110Pd, 110In and for isotopic sources of 110,117,124In is explored in the framework of the Smoluchowski equation. A statistical model including dissipation is employed to study particle emission in asymmetric and symmetric fission of the In nucleus with different isospins. Calculations show that for a fissioning nucleus which has a larger isospin, charged particle multiplicities are no longer sensitive to dissipation strength or the fission time scale. Hence, for those systems with very high isospins, protons and
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2

FARIA DA VEIGA, PAULO A., MICHAEL O'CARROLL, and ANTÔNIO FRANCISCO NETO. "ISOSPIN–SPIN INTERCHANGE SYMMETRY AND TWO-BARYON BOUND STATES IN (3+1)-DIMENSIONAL LATTICE QCD WITH TWO-FLAVORS AND STRONG COUPLING." International Journal of Modern Physics A 26, no. 25 (2011): 4387–404. http://dx.doi.org/10.1142/s0217751x11054577.

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We determine two-baryon bound states in a 3+1 lattice QCD model with improved Wilson action and two flavors. We work in the strong coupling regime: small hopping parameter κ > 0 and much smaller plaquette coupling β > 0. In this regime, it is known that the low-lying energy–momentum spectrum is comprised of baryons and mesons with asymptotic masses -3 ln κ and -2 ln κ, respectively. We show that the dominant baryon–baryon interaction is an order κ2 space-range-one [Formula: see text]-exchange potential. We also show that this interaction has an important and novel isospin–spin interchang
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3

ROBSON, B. A. "RELATION BETWEEN STRONG AND WEAK ISOSPIN." International Journal of Modern Physics E 13, no. 05 (2004): 999–1018. http://dx.doi.org/10.1142/s0218301304002521.

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The relation between strong isospin I and weak isospin i is discussed. In particular an equation between the third components I3 and i3 is given. This relation indicates that the strong isospin and weak isospin symmetries are both SU (2) subgroups of a new SU (3) symmetry underlying the structure of leptons and quarks.
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4

LI, QINGFENG, and ZHUXIA LI. "THE ISOSPIN DISTRIBUTION OF FRAGMENTS IN REACTIONS 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru, and 96Zr + 96Zr AT BEAM ENERGY 400 AMeV." Modern Physics Letters A 17, no. 07 (2002): 375–85. http://dx.doi.org/10.1142/s0217732302006618.

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The isospin distribution of particles and fragments in collisions 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru and 96Zr + 96Zr at beam energy 400 AMeV is studied with isospin-dependent QMD model. We find that the rapidity distribution of differential neutron–proton counting in neutron rich nucleus–nucleus collisions at intermediate energies is sensitive to the isospin-dependent part of nuclear potential. The study of the N/Z ratio of nucleons, light charged particles (LCP) and intermediate mass fragments (IMF) shows that the isospin-dependent part of nuclear potential drives IMF to be more isospin sy
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5

Jain, Ashok Kumar, and Swati Garg. "Isospin Conservation in Neutron Rich Systems of Heavy Nuclei." EPJ Web of Conferences 178 (2018): 05007. http://dx.doi.org/10.1051/epjconf/201817805007.

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It is generally believed that isospin would diminish in its importance as we go towards heavy mass region due to isospin mixing caused by the growing Coulomb forces. However, it was realized quite early that isospin could become an important and useful quantum number for all nuclei including heavy nuclei due to neutron richness of the systems [1]. Lane and Soper [2] also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations [3, 4] for the fission fragment distributions obtained from he
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6

RAFALSKI, M., W. SATUŁA, and J. DOBACZEWSKI. "ISOSPIN MIXING OF ISOSPIN-PROJECTED SLATER DETERMINANTS: FORMALISM AND PRELIMINARY APPLICATIONS." International Journal of Modern Physics E 18, no. 04 (2009): 958–64. http://dx.doi.org/10.1142/s0218301309013105.

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We report on the development of a new theoretical tool that allows for isospin projection of Slater determinants and we present its first applications. In particular, we determine the isospin mixing in ground states of N = Z nuclei and discuss its dependence on the size of the harmonic-oscillator basis used in the calculations. We also discuss the unphysical contribution to the isospin mixing caused by the spurious isospin-symmetry breaking inherent to the mean-field approach. We show that these contributions may be as large as 30% of the value of the isospin-mixing parameter.
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7

Li, Bao-An, Che Ming Ko, and Wolfgang Bauer. "Isospin Physics in Heavy-Ion Collisions at Intermediate Energies." International Journal of Modern Physics E 07, no. 02 (1998): 147–229. http://dx.doi.org/10.1142/s0218301398000087.

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In nuclear collisions induced by stable or radioactive neutron-rich nuclei a transient state of nuclear matter with an appreciable isospin asymmetry as well as thermal and compressional excitation can be created. This offers the possibility to study the properties of nuclear matter in the region between symmetric nuclear matter and pure neutron matter. In this review, we discuss recent theoretical studies of the equation of state of isospin-asymmetric nuclear matter and its relations to the properties of neutron stars and radioactive nuclei. Chemical and mechanical instabilities as well as the
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8

Garg, Swati, and Ashok Kumar Jain. "Does Compound Nucleus remember its Isospin- An Evidence from the Fission Widths." EPJ Web of Conferences 178 (2018): 05008. http://dx.doi.org/10.1051/epjconf/201817805008.

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We present an evidence of isospin effects in nuclear fission by comparing the fission widths for reactions involving different isospin states of the same compound nucleus (CN). Yadrovsky [1] suggested this possibility in 1975. Yadrovsky obtained the fission widths for two reaction data sets, namely 206Pb(α,f) and 209Bi(p,f), both leading to same CN, and concluded that “a nucleus remembers the isospin value of the nuclear states leading to fission”. We obtain the fission decay widths for both the T0 + ½ and T0 − ½ states of CN by using two appropriate reaction data sets. We then compare the fis
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9

DURGANANDINI, P. "SU(2) WZW THEORIES WITH HERMITIAN PERTURBATIONS." Modern Physics Letters A 06, no. 36 (1991): 3349–58. http://dx.doi.org/10.1142/s0217732391003869.

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We show the existence of higher order conserved quantities of isospin 1 (with spin 0,2,4,6,…) and isospin 0,2 (with spin 1,3,5,7,…) for the k=2 SU(2) WZW theory perturbed by the singlet combination of the isospin 1 primary field. We also show the possible existence of conserved isospin 0 current with spin 3 in the k→∞ limit. We also analyze these theories for finite k(≥3) and show that at least by counting arguments there exist no higher conserved quantities in these cases.
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10

Liu, He, and Jun Xu. "Isospin Effect on Baryon and Charge Fluctuations from the pNJL Model." Universe 7, no. 1 (2020): 6. http://dx.doi.org/10.3390/universe7010006.

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We have studied the possible isospin corrections on the skewness and kurtosis of net-baryon and net-charge fluctuations in the isospin asymmetric matter formed in relativistic heavy-ion collisions at RHIC-BES energies, based on a 3-flavor Polyakov-looped Nambu–Jona–Lasinio model. With typical scalar–isovector and vector–isovector couplings leading to the splitting of u and d quark chiral phase transition boundaries and critical points, we have observed considerable isospin effects on the susceptibilities, especially those of net-charge fluctuations. Reliable experimental measurements at even l
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11

Al-Khudair, Falih H. "Investigation of isospin excited and mixed-symmetry states in even–even N = Z nuclei." International Journal of Modern Physics E 27, no. 08 (2018): 1850065. http://dx.doi.org/10.1142/s0218301318500659.

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Mixed-symmetry and isospin excited states are typical of the interacting boson model with isospin (IBM-3). With a view to look for such states, levels scheme of the IBM-3 dynamical symmetry is discussed. A systematic investigation in the proton and neutron degrees of freedom of the energy levels has been carried out. A sequence of isospin excitation bands has been identified. We have analyzed the wave functions and given the symmetrical labeling of the states. The transition probabilities between the isospin excitation states of model limits are analyzed in terms of isoscalar and isovector dec
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12

Fernandez Ruiz, D., S. Viñals, O. Tengblad та ін. "R-Matrix study of the β+decay of 8B to the highly excited states of 8Be". EPJ Web of Conferences 290 (2023): 02008. http://dx.doi.org/10.1051/epjconf/202329002008.

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Experiment IS633 was conducted at the ISOLDE facility with the aim of studying the 2+ isospin doublet of 8Be, the only expected case of nearly equal isospin configuration mixing. The doublet was previously probed by reaction studies where the feeding does not depend on the isospin. Beta decay studies are sensitive to the isospin composition of the doublet since the Fermi and Gamow-Teller strengths are heavily dependent of isospin. In this experiment the doublet was probed through the EC/β+ feeding from 8B. A four-particle telescope setup with a C-foil in the centre was employed to stop the 8B
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13

BONNEAU, LUDOVIC, JULIEN LE BLOAS, PHILIPPE QUENTIN, JOHANN BARTEL, and DANIEL STROTTMAN. "ISOSPIN MIXING IN THE HIGHER TAMM-DANCOFF APPROXIMATION." International Journal of Modern Physics E 18, no. 04 (2009): 951–57. http://dx.doi.org/10.1142/s0218301309013099.

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We present a formalism to study the isospin content of a nuclear state in the framework of the Higher Tamm-Dancoff Approximation. This formalism is then applied to the description of even-even N = Z nuclei. Finally a schematic two-level model provides some insight into the isospin-mixing mechanism at work and the impact of the pairing correlations on the isospin-mixing parameter.
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14

Mallik, S., F. Gulminelli, and D. Gruyer. "Constraining the density dependence of the symmetry energy: the isospin transport ratio revisited." Journal of Physics G: Nuclear and Particle Physics 49, no. 1 (2021): 015102. http://dx.doi.org/10.1088/1361-6471/ac3473.

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Abstract The isospin diffusion of the quasi-projectile formed in the Ni 64 , 58 on Ni 64 , 58 reactions in the Fermi energy domain is investigated in the framework of the Boltzmann–Uehling–Uhlenbeck transport model. The well known isospin transport ratio observable is revisited, with the aim of insuring an optimal comparison between experimental data and theoretical calculations and reducing the present uncertainties in the extraction of empirical equation of state parameters. We show that isospin transport ratios are sensitive to all the low order isovector parameters (E sym, L sym and K sym,
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15

Khunjua, Tamaz, Konstantin Klimenko, and Roman Zhokhov. "Dense quark matter with chiral and isospin imbalance: NJL-model consideration." EPJ Web of Conferences 191 (2018): 05015. http://dx.doi.org/10.1051/epjconf/201819105015.

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Isospin asymmetry is the well-known property of dense quark matter, which exists in the compact stars and is produced in heavy ion collisions. On the other hand, the chiral imbalance between left- and right- handed quarks is another highly anticipated phenomenon that could occur in the dense quark matter. To investigate quark matter under these conditions, we take into account baryon – μB, isospin – μI and chiral isospin – μI5 chemical potentials and study QCD phase portrait using NJL4 model generalized to two massive quarks that could condense into the pion condensation. We have shown that th
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16

TRIPATHI, R., A. BONASERA, S. WUENSCHEL, et al. "ROLE OF QUASIPROJECTILE ISOSPIN ASYMMETRY IN NUCLEAR FRAGMENTATION." International Journal of Modern Physics E 21, no. 03 (2012): 1250019. http://dx.doi.org/10.1142/s021830131250019x.

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Fragment yield data, selected with different values of the isospin asymmetry of the quasiprojectile from 78, 86 Kr +58, 64 Ni reactions at E lab = 35 MeV/nucleon, have been analyzed within the framework of Landau free energy approach. Fits to the free energy data indicated the system to be in the regime of a first-order phase transition. The plot of free energy versus isospin asymmetry of the fragments showed a systematic change with increasing isospin asymmetry of the fragmenting source. This observation demonstrated the role of quasiprojectile isospin asymmetry as an external field which gov
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17

Smirnova, Nadezda A. "Isospin-Symmetry Breaking within the Nuclear Shell Model: Present Status and Developments." Physics 5, no. 2 (2023): 352–80. http://dx.doi.org/10.3390/physics5020026.

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The paper reviews the recent progress in the description of isospin-symmetry breaking within the nuclear shell model and applications to actual problems related to the structure and decay of exotic neutron-deficient nuclei and nuclei along the N=Z line, where N is the neutron number and Z the atomic number. The review recalls the fundamentals of the isospin formalism for two-nucleon and many-nucleon systems, including quantum numbers, the spectrum’s structure and selection rules for weak and electromagnetic transitions; and at the end, summarizes experimental signatures of isospin-symmetry bre
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18

He, Lianyi, Meng Jin, and Pengfei Zhuang. "Effect of UA(1) Breaking on Chiral Phase Structure and Pion Superfluidity at Finite Isospin Chemical Potential." Modern Physics Letters A 22, no. 07n10 (2007): 637–43. http://dx.doi.org/10.1142/s0217732307023237.

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We investigate the isospin chemical potential effect in the frame of SU(2) Nambu-Jona-Lasinio model. When the isospin chemical potential is less than the vacuum pion mass, the phase structure with two chiral phase transition lines does not happen due to UA(1) breaking of QCD. When the isospin chemical potential is larger than the vacuum pion mass, the ground state of the system is a Bose-Einstein condensate of charged pions.
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19

SPEHLER, D., and G. C. MARQUES. "UNIFIED ELECTROWEAK MODEL BASED ON SPACE–TIME AND ISOSPIN SYMMETRIES." International Journal of Modern Physics A 20, no. 01 (2005): 175–98. http://dx.doi.org/10.1142/s0217751x05019452.

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We propose a spinorial approach to the unified electroweak interactions, in which no use is made of spontaneous symmetry breakdown. No scalar particles are needed in order to break the symmetry. No reference is made to gauge symmetry. Our approach stresses the role of space–time and isospin symmetries in the build up of the electroweak model. Internal degrees of freedom, such as isospin, are incorporated in the theory by using spinors carrying isospin indices. All vector bosons are described by a rank 2 field in the spinorial and the isospinorial indices. Leptons are accomodated in a rank 1 sp
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20

LIU, JIAN-YE, YONG ZHONG XING, HANG LIU, WEN-JUN GUO, and XI GUO LEE. "ENTRANCE CHANNEL EFFECTS ON THE ISOSPIN FRACTIONATION AT INTERMEDIATE ENERGY HEAVY ION COLLISIONS." International Journal of Modern Physics E 14, no. 04 (2005): 587–97. http://dx.doi.org/10.1142/s0218301305003430.

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We investigate the dependence of isospin fractionation degree on the entrance channel condition, which includes the impact parameter, the beam energy, the mass and the neutron–proton ratio of the colliding system as well as quantifying the gas phase and the liquid phase by using the isospin dependent quantum molecular dynamics model. We found that the isospin fractionation degree increases markedly with the enhancements of the neutron–proton ratio of system and the beam energy; however, it decreases with increasing system mass as well as slowly increases with the enhancement of the impact para
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21

CHAKRABORTY, S., B. SAHOO, and S. SAHOO. "ISOSPIN DEPENDENCE OF THE SATURATION PROPERTIES OF ASYMMETRIC NUCLEAR MATTER IN NONRELATIVISTIC MEAN FIELD MODEL." International Journal of Modern Physics E 21, no. 09 (2012): 1250079. http://dx.doi.org/10.1142/s0218301312500796.

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A phenomenological momentum dependent interaction (MDI) is considered to describe the equation of state (EOS) for isospin asymmetric nuclear matter (ANM), where the density dependence of the nuclear symmetry is the basic input. In this interaction, the symmetry energy shows soft dependence of density. Within the nonrelativistic mean field approach we calculate the nuclear matter fourth-order symmetry energy E sym, 4 (ρ). Our result shows that the value of E sym, 4 (ρ) at normal nuclear matter density ρ0( = 0.161 fm -3) is less than 1 MeV conforming the empirical parabolic approximation to the
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22

SATUŁA, W., J. DOBACZEWSKI, W. NAZAREWICZ, M. BORUCKI, and M. RAFALSKI. "ISOSPIN MIXING IN THE VICINITY OF THE N = Z LINE." International Journal of Modern Physics E 20, no. 02 (2011): 244–51. http://dx.doi.org/10.1142/s0218301311017582.

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We present the isospin- and angular-momentum-projected nuclear density functional theory (DFT) and its applications to the isospin-breaking corrections to the superallowed β-decay rates in the vicinity of the N = Z line. A preliminary value obtained for the Cabibbo–Kobayashi–Maskawa matrix element, |Vud| = 0.97463(24), agrees well with the recent estimate by Towner and Hardy [Phys. Rev.C77, 025501 (2008)]. We also discuss new opportunities to study the symmetry energy by using the isospin-projected DFT.
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23

Selva, Giovanni, Xavier Roca-Maza, and Gianluca Colò. "Isospin Symmetry Breaking Effects on the Mass-Radius Relation of a Neutron Star." Symmetry 13, no. 1 (2021): 144. http://dx.doi.org/10.3390/sym13010144.

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Isospin symmetry breaking effects on the mass-radius relation of a cold, non-accreting neutron star are studied on the basis of two Skyrme Energy Density Functionals (EDFs). One functional contains isospin symmetry breaking terms other than those typically included in Skyrme EDFs while its counterpart is of standard form. Both functionals are based on the same fitting protocol except for the observables and pseudo-observables sensitive to the isospin symmetry breaking channel. The quality of those functionals is similar in the description of terrestrial observables but choosing either of them
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24

Lee, Bum-Hoon, Shahin Mamedov, and Chanyong Park. "Nucleon mass splitting in the isospin medium." International Journal of Modern Physics A 29, no. 29 (2014): 1450170. http://dx.doi.org/10.1142/s0217751x1450170x.

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Using the AdS/CFT correspondence, we investigate a nucleon mass splitting and pion–nucleon coupling in the isospin medium. We find that there exists a nucleon mass splitting which is exactly given by the half of the meson mass splitting because nucleon has the half isospin charge of the charged mesons. In addition, we also investigate the pion–nucleon and four pion interactions which requires the modification of the known Abelian-type unitary gauge fixing because of the non-Abelian structure of the isospin medium. After finding the non-Abelian unitary gauge fixing, we find that in the isospin
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25

Kaur, D., V. Kaur, and S. Kumar. "Probing the Effect of Different Cross Sections in Asymmetric Systems." Ukrainian Journal of Physics 57, no. 8 (2012): 806. http://dx.doi.org/10.15407/ujpe57.8.806.

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We present a complete systematic theoretical study of the multifragmentation for asymmetric colliding nuclei in heavy-ion reactions in the energy range between 50 and 1000 MeV/nucleon by using the isospin-dependent quantum molecular dynamics (IQMD) model. We have observed an interesting outcome for asymmetric colliding nuclei. The comparison between the symmetric and asymmetric colliding nuclei for the isospin-independent and isospin-dependent cross sections has been performed. We have found the pronounced effect of different cross sections and mass asymmetry on the nuclear reaction dynamics.
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26

Mehta, Parit, Rana Nandi, Rosana de Oliveira Gomes, Veronica Dexheimer, and Jan Steinheimer. "Low Density Neutron Star Matter with Quantum Molecular Dynamics: The Role of Isovector Interactions." Universe 8, no. 7 (2022): 380. http://dx.doi.org/10.3390/universe8070380.

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The effect of isospin-dependent nuclear forces on the inner crust of neutron stars is modeled within the framework of Quantum Molecular Dynamics (QMD). To successfully control the density dependence of the symmetry energy of neutron-star matter below nuclear saturation density, a mixed vector-isovector potential is introduced. This approach is inspired by the baryon density and isospin density-dependent repulsive Skyrme force of asymmetric nuclear matter. In isospin-asymmetric nuclear matter, the system shows nucleation, as nucleons are arranged into shapes resembling nuclear pasta. The depend
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27

Nayak, Ranjit. "Kaon Isospin Fluctuations in ALICE at the LHC." Proceedings 10, no. 1 (2019): 22. http://dx.doi.org/10.3390/proceedings2019010022.

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The first measurements of isospin fluctuations in the kaon sector is presented in Pb-Pb collisions at s N N = 2.76 TeV. A robust statistical observable was used to extract the isospin fluctuations of neutral and charged kaons as a function of collision centrality. The results show a significant variation in the behaviour of ν d y n in data when compared to Monte-Carlo models such as HIJING and AMPT. The deviation from 1/n scaling in data indicates possible isospin fluctuation in the kaon sector in heavy ion collisions.
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28

Gaitanos, T., G. Ferini, M. Colonna, M. Di Toro, and H. H. Wolter. "Isospin Effects on Subthreshold Particle Production." HNPS Proceedings 14 (December 5, 2019): 7. http://dx.doi.org/10.12681/hnps.2240.

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The production/absorption rate of particles in compressed and heated asymmetric matter is studied using a Relativistic Mean Field (RMF) transport model with an isospin dependent collision term. We show that the K+/K° ratio reflects the isospin effects on the production rates just because of the large sensitivity around the threshold. The results are very promising with respect to the possibility of a direct link between particle production data in exotic Heavy Ion Collisions (HIC) and the isospin dependent part of the Equation of State (EoS) at high baryon densities.
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29

DMITRAŠINOVIĆ, V., KEITARO NAGATA, and ATSUSHI HOSAKA. "CHIRAL PROPERTIES OF BARYON INTERPOLATING FIELDS." Modern Physics Letters A 23, no. 27n30 (2008): 2381–84. http://dx.doi.org/10.1142/s0217732308029423.

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We study the chiral transformation properties of all possible local (non-derivative) interpolating field operators for baryons consisting of three quarks with two flavors, assuming good isospin symmetry. We derive and use the relations/identities among the baryon operators with identical quantum numbers that follow from the combined color, Dirac and isospin Fierz transformations. These relations reduce the number of independent baryon operators with any given spin and isospin. The Fierz identities also effectively restrict allowed baryon chiral multiplets. It turns out that the chiral multiple
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30

Lü, Gang, та Qin-Qin Zhi. "Direct CP Violation from Isospin Symmetry Breaking Effects for the Decay Process B-s→P(V)π0 in PQCD". Advances in High Energy Physics 2019 (21 травня 2019): 1–14. http://dx.doi.org/10.1155/2019/6927130.

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We investigate the direct CP violation for the decay process of B-s→P(V)π0 (P,V refer to the pseudoscalar meson and vector meson, resp.) via isospin symmetry breaking effects from the π0-η-η′ mixing mechanism in PQCD factorization approach. Isospin symmetry breaking arises from the electroweak interaction and the u-d quark mass difference by the strong interaction, which are known to be tiny. However, we find that isospin symmetry breaking at the leading order shifts the CP violation due to the new strong phases.
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31

Di Toro, M., S. J. Yennello, and B. A. Li. "Isospin flows." European Physical Journal A 30, no. 1 (2006): 153–63. http://dx.doi.org/10.1140/epja/i2006-10113-x.

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32

Balachandran, A. P., B. Rai, G. Sparano, and A. M. Srivastava. "Isospin balls." Physical Review Letters 59, no. 8 (1987): 853–56. http://dx.doi.org/10.1103/physrevlett.59.853.

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33

Bijnens, Johan, and Fredrik Borg. "Isospin breaking in decays I: strong isospin breaking." Nuclear Physics B 697, no. 1-2 (2004): 319–42. http://dx.doi.org/10.1016/j.nuclphysb.2004.07.011.

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34

HANHART, CHRISTOPH. "ISOSPIN BREAKING IN HADRONIC REACTIONS." International Journal of Modern Physics A 20, no. 02n03 (2005): 543–45. http://dx.doi.org/10.1142/s0217751x05021737.

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In the standard model the isospin symmetry is broken by electro magnetic interactions as well as the difference in the quark masses. Given a systematic scheme that allows to disentangle these two effects it is possible to get direct access to properties of QCD from low and medium energy hadronic reactions. Recently interest in isospin breaking reactions has revived due to the measurement of a forward–backward asymmetry in pn→dπ0 as well as the total cross section for dd→απ0—both quantities vanish in an isospin symmetric world. The current status of the theoretical analysis for these reactions
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35

Quinonez, Michael, Arun Kingan, and Larry Zamick. "Manifestations of isospin in nearest neighbor spacing distributions for the f-p model space." International Journal of Modern Physics E 26, no. 10 (2017): 1750060. http://dx.doi.org/10.1142/s0218301317500604.

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The strong interactions are charge independent. If we limit ourselves to the strong interactions, we have the isospin [Formula: see text] as a good quantum number. Here, we consider the lack of level repulsion of states of different isospin and how this effect manifests in nearest neighbor spacing (NNS) histograms, which provide a visual and statistical context in which to study distributions of energy level spacings. In particular, we study nucleons in the [Formula: see text] model space for the nucleus [Formula: see text]. We also compare NNS distributions produced in the isospin formalism t
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36

YOSHIKAWA, TADASHI. "THE VERTEX CORRECTIONS IN TECHNICOLOR MODEL WITHOUT EXACT CUSTODIAL SYMMETRY." Modern Physics Letters A 10, no. 22 (1995): 1601–12. http://dx.doi.org/10.1142/s0217732395001721.

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We discuss the effects of isospin breaking which appear in the vertex corrections for [Formula: see text], Zτ+τ− and Wντ in a one-family technicolor model without exact custodial symmetry. By means of the effective Lagrangian approach we compute the vertex corrections for [Formula: see text], Zττ and Wτν. When the isospin symmetry in technilepton sector is not exact and there are a few lighter technivector mesons that are composed by technileptons, the technivector mesons contribute to the vertex corrections. It would be the evidence of the isospin breaking when the difference of the vertex co
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37

Tawfik, Abdel Nasser. "QCD Phase Structure and In-Medium Modifications of Meson Masses in Polyakov Linear-Sigma Model with Finite Isospin Asymmetry." Universe 9, no. 6 (2023): 276. http://dx.doi.org/10.3390/universe9060276.

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In the QCD-like effective model, the Polyakov linear-sigma model, the isospin sigma field (σ¯3=fK±−fK0) and the third generator of the matrix of the explicit symmetry breaking [h3=ma02fK±−fK0] are estimated in terms of the decay constants of the neutral (fK0) and charged Kaon (fK±) and the mass of a0 meson. Both quantities σ¯3 and h3 are then evaluated, at finite baryon (μB), isospin chemical potential (μI), and temperature (T). Thereby, the dependence of the critical temperature on isospin chemical potential could be mapped out in the (T−μI) phase diagram In the QCD-like effective model, the
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38

Yang, Li, and Xin-Jian Wen. "Asymmetric magnetized QCD matter realized by scalar and instanton-induced interactions." International Journal of Modern Physics A 33, no. 21 (2018): 1850123. http://dx.doi.org/10.1142/s0217751x18501233.

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In a strong magnetic field utilizing a two-flavor NJL model, the isospin symmetry and asymmetry can be realized by altering the fraction parameter [Formula: see text] of the two kinds of interactions, i.e. the scalar coupling and instanton-induced coupling. As [Formula: see text] increases, the [Formula: see text] quark mass decreases while [Formula: see text] quark mass increases monotonously. The two mass lines cross at [Formula: see text] with an isospin symmetry mass [Formula: see text]. Even in the flavor-decoupled state, i.e. the strong isospin asymmetry, the [Formula: see text] and [For
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39

SALEHI, NASRIN, and ALI AKBAR RAJABI. "PROTON STATIC PROPERTIES BY USING HYPERCENTRAL CONSTITUENT QUARK MODEL AND ISOSPIN." Modern Physics Letters A 24, no. 32 (2009): 2631–37. http://dx.doi.org/10.1142/s0217732309031016.

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The static properties of protons are useful for understanding the quark structure of the proton. In his work we have introduced the hypercentral constituent quark model and isospin dependent potentials. Here constituent quarks interact with each other via a potential in which we have taken into account the three-body force effect and the standard two-body potential contributions. According to our model the static properties of protons containing u and d quarks are better than the other models and closer to experimental results. The two key ingredients of this improvement are the effective quar
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40

Horvathy, Peter A., and Pengming Zhang. "Kerner Equation for Motion in a Non-Abelian Gauge Field." Universe 9, no. 12 (2023): 519. http://dx.doi.org/10.3390/universe9120519.

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The equations of motion of an isospin-carrying particle in a Yang–Mills and gravitational field were first proposed in 1968 by Kerner, who considered geodesics in a Kaluza–Klein-type framework. Two years later, the flat space Kerner equations were completed by also considering the motion of the isospin by Wong, who used a field-theoretical approach. Their groundbreaking work was then followed by a long series of rediscoveries whose history is reviewed. The concept of isospin charge and the physical meaning of its motion are discussed. Conserved quantities are studied for Wu–Yang monopoles and
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41

Kim, Myungkuk, Youngman Kim, Sangyong Jeon, and Chang-Hwan Lee. "Pion Productions with Isospin-Dependent In-Medium Cross Sections." Universe 8, no. 11 (2022): 564. http://dx.doi.org/10.3390/universe8110564.

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Total pion yields and π−/π+ ratios in two Sn+Sn collision systems, 132Sn+124Sn (neutron rich) and 108Sn+112Sn (neutron poor) at E=270A MeV, are significant observables in SAMURAI Pion-Reconstruction and Ion-Tracker (SπRIT) experiments. Based on a recently developed transport model, DaeJeon Boltzmann–Uehling–Uhlenbeck (DJBUU), we investigate the isospin-dependent inmedium effects by including density- and isospin-dependent cross sections for Δ baryon productions. We compare our results with the SπRIT data by considering these effects. We find that the yields as well as the ratios strongly depen
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42

OH, PHILLIAL. "SYMPLECTIC STRUCTURE OF ISOSPIN PARTICLES IN YANG-MILLS FIELDS." Modern Physics Letters A 07, no. 21 (1992): 1923–30. http://dx.doi.org/10.1142/s0217732392001634.

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Using Dirac’s constraint analysis, we explore the Hamiltonian formalism of isospin particles in external Yang-Mills fields without kinetic and potential energy term. We consider an example of isospin particle in ’t Hooft-Polyakov magnetic monopole field and discuss possible quantization condition of magnetic charge in terms of geometric quantization.
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43

LE BLOAS, JULIEN, LUDOVIC BONNEAU, PHILIPPE QUENTIN, JOHANN BARTEL, and DANIEL STROTTMAN. "EFFECTS OF VIBRATIONAL AND PAIRING CORRELATIONS ON ISOSPIN MIXING IN THE HIGHER TAMM-DANCOFF APPROXIMATION." International Journal of Modern Physics E 19, no. 04 (2010): 568–74. http://dx.doi.org/10.1142/s0218301310014984.

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In the framework of the Higher Tamm-Dancoff Approximation which allows for a consistent treatment of pairing and quadrupole vibrational correlations preserving the particle-number symmetry and the Pauli principle, we compare the isospin content of ground and excited Kπ = 0+ states including either type of the above mentioned correlations using an approximate projection-after-variation technique for isospin. The pairing correlations are described with a delta interaction using the same strength in the T = 0 and T = 1 channels, whereas the vibrational correlations are treated with an isoscalar q
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44

TAKAISHI, TETSUYA. "DENSITY OF STATES METHOD AT FINITE ISOSPIN DENSITY." Modern Physics Letters A 19, no. 12 (2004): 909–20. http://dx.doi.org/10.1142/s0217732304013805.

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The density of states method is applied for lattice QCD at a finite isospin density. The advantage of this method is that one can easily obtain results for various values of parameters (quark mass, coupling constant and the number of flavors). We compare results for the chiral condensate and the quark number density with those from the R-algorithm and find that they are in good agreement. By calculating the chiral condensate we obtain information on the phase structure for various quark flavors and isospin chemical potentials. We also show results for the chiral condensate at two different qua
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45

Moosavi Nejad, S. M., and A. Armat. "Determination of hyperon properties through the variational method considering the hyperfine interaction." International Journal of Modern Physics E 28, no. 10 (2019): 1950087. http://dx.doi.org/10.1142/s0218301319500873.

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Performing a fit procedure on the hyperon masses, we first determine the free parameters in the Cornell-like hypercentral potential between the constituent quarks of hyperons in their ground state. To this end, using the variational principle, we apply the hyperspherical Hamiltonian including the Cornell-like hypercentral potential and the perturbation potentials due to the spin–spin, spin–isospin and isospin–isospin interactions between constituent quarks. In the following, we compute the hyperon magnetic moments as well as radiative decay widths of spin-3/2 hyperons using the spin-flavor wav
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46

Bayar, M., та V. R. Debastiani. "a0(980)–f0(980) mixing in χc1 decay". EPJ Web of Conferences 199 (2019): 04009. http://dx.doi.org/10.1051/epjconf/201919904009.

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We investigate the isospin breaking in the ${\chi _{c1}} \to {\pi ^0}{\pi ^ + }{\pi ^ - }$ and ${\chi _{c1}} \to {\pi ^0}{\pi ^0}\eta $ decays and its relation to the a0(980) – f0(980) mixing, which was measured by the BESIII Collaboration. The isospin violation is introduced through the use of different masses for the charged and neutral kaons, either in the propagators of pairs of mesons created in the χc1 decay, or in the propagators inside the T matrix. We find that the most important effect in the total amplitude is the isospin breaking inside the T matrix which is essential to get a good
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47

JI, XIAOBIN. "N* PRODUCTION FROM J/ψ DECAYS AT BES". International Journal of Modern Physics A 20, № 08n09 (2005): 1834–37. http://dx.doi.org/10.1142/s0217751x05023438.

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The πN system in [Formula: see text] is limited to be pure isospin 1/2 due to isospin conservation. This is a big advantage in studying N*→πN from the J/ψ decays, compared with πN and γN experiments which mix isospin 1/2 and 3/2 for πN system. Based on the 58 million J/ψ data collected at the Beijing Electron Positron Collider, [Formula: see text] and other decay channels are analyzed. In the decay [Formula: see text], three peaks show up very clearly at 1400 MeV/c2, 1500 MeV/c2 and 1670 MeV/c2 in the πN invariant mass spectrum with additional peak around 2030 MeV/c2 which may be caused by a n
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48

Bisoi, Abhijit, Y. Sapkota, S. Sarkar, and M. Saha Sarkar. "Semi-empirical evaluation of isospin mixing from forbidden E1 transitions." Journal of Physics: Conference Series 2586, no. 1 (2023): 012064. http://dx.doi.org/10.1088/1742-6596/2586/1/012064.

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Abstract ΔT = 0 electric dipole transitions in self conjugate nuclei, forbidden by isospin selection rules, are readily seen in nature. This implies that the states participating in these transitions may not be of pure isospin T. This work identifies some of these transitions in a few upper-sd shell self-conjugate nuclei and attempts to calculate the degree of isospin mixing in these nuclei by using the standard two-level mixing formalism in a semi-empirical approach. The physically observed E1 transitions are broken down into two theoretically allowed ΔT = 1 channels. These allowed components
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49

Del Nobile, Eugenio. "Halo-Independent Comparison of Direct Dark Matter Detection Data." Advances in High Energy Physics 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/604914.

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We review the halo-independent formalism that allows comparing data from different direct dark matter detection experiments without making assumptions on the properties of the dark matter halo. We apply this method to spin-independent WIMP-nuclei interactions, for both isospin-conserving and isospin-violating couplings, and to WIMPs interacting through an anomalous magnetic moment.
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50

Achasov, N. N., and G. N. Shestakov. "New information on the strong isospin symmetry breaking in the reactions of the a00(980) and f0(980) resonance production." EPJ Web of Conferences 212 (2019): 03002. http://dx.doi.org/10.1051/epjconf/201921203002.

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We discuss the isotopic symmetry breaking as a tool of studying the production mechanisms and nature of light scalar mesons. The anomalous isospin breaking effects can appear not only due to the $ a_0^0(980) - {f_0}(980) $ mixing, but also for any mechanism of the production of the $ \bar{K} $ pairs with a definite isospin in the S wave.
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