Relevant bibliographies by topics / DWBA (Distorted Wave Born Approximation

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  2. Dissertations / Theses
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Academic literature on the topic 'DWBA (Distorted Wave Born Approximation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "DWBA (Distorted Wave Born Approximation"

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Brajamani, S., N. Ranjit Singh, M. Babuyaima, and P. S. Mazumdar. "Double differential cross sections in the electron impact ionization of helium." Canadian Journal of Physics 72, no. 3-4 (1994): 126–29. http://dx.doi.org/10.1139/p94-020.

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The double differential cross sections for electron impact ionization of helium are evaluated in the framework of a distorted wave approximation that takes into account the effects of initial channel, final channel, and target distortion. The present results are in fair agreement with the measured values and rigorous DWBA (distorted-wave Born approximation) results of McCarthy and Zhang.
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Madison, Don H., and Ola Al-Hagan. "The Distorted-Wave Born Approach for Calculating Electron-Impact Ionization of Molecules." Journal of Atomic, Molecular, and Optical Physics 2010 (March 29, 2010): 1–24. http://dx.doi.org/10.1155/2010/367180.

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The distorted-wave Born approximation (DWBA) has been one of the most successful theoretical approaches for treating electron collisions with complicated atoms, and recently the DWBA has been successfully extended to treat electron-impact ionization of molecules. The purpose of this paper is to give an overview of that development and to provide a summary of the recent experimental and theoretical works examining low to intermediate energy electron-impact single ionization of molecules.
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Condori, R. Pampa, H. Dias, and J. Lubian. "Using a double folding potential for the derivation of the spectroscopic factors of the (3He, d) transfer reaction." International Journal of Modern Physics E 25, no. 09 (2016): 1650061. http://dx.doi.org/10.1142/s0218301316500610.

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In this paper, the [Formula: see text] reactions are revisited, with the goal of obtaining spectroscopic factors (SF) for the transition to the ground state of some residual nuclei, applying the distorted wave Born approximation (DWBA). The double-folding São Paulo Potential (SPP) was used to derive the distorted wave function in the entrance and exit channels. The derived SF are compared with the results of extensive shell model calculations showing a rather good agreement.
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Smith, Joy N., Patrick H. Ressler, and Joseph D. Warren. "A distorted wave Born approximation target strength model for Bering Sea euphausiids." ICES Journal of Marine Science 70, no. 1 (2012): 204–14. http://dx.doi.org/10.1093/icesjms/fss140.

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Abstract Smith, J. N., Ressler, P. H., and Warren, J. D. 2013. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, 70:204–214. Acoustic surveys monitor euphausiid populations in the Bering Sea because of their importance as prey for walleye pollock and other organisms. Various scattering models exist to convert acoustic backscatter data to estimates of euphausiid numerical density or biomass, but a target strength (TS) model specific to Bering Sea euphausiids has not been available. This study parameterized a distorted wave Born approximation (DWBA) scattering model using physical (length and body shape) and material (density contrast, g, and sound speed contrast, h) properties measured from live euphausiids. All model parameters (length, shape, material properties, orientation) were evaluated for their effect on predicted TS. A polynomial function was used to describe animal shape and produced smaller TS estimates compared to a taper function, as is traditionally used in DWBA scattering models of euphausiids. Animal length was positively correlated with TS, but variations in other parameters (including material properties and orientation) also produced large changes in TS. Large differences in TS between estimates calculated using measured versus literature material property values caused large variations in acoustic estimates of euphausiid numerical densities (animals m−3) which emphasizes the importance of collecting site-specific g and h measurements when possible.
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A Konovalov, Dmitry, and Ian E McCarthy. "Calculation of Electron Impact Ionisation of Atomic Hydrogen with the Exact Final-state Boundary Conditions." Australian Journal of Physics 47, no. 2 (1994): 123. http://dx.doi.org/10.1071/ph940123.

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We present a new and very powerful theoretical method-a distorted-wave Born approximation (DWBA) with an arbitrary final-state electron-electron correlation function. This method combines the flexibility of including any theoretically desired electron-electron correlation and the physical clarity of the DWBA method. Calculations explore the use of an auxiliary final-state wave function with the exact boundary condition, in attempting to describe the absolute cross sections for ionisation of helium in coplanar symmetric kinematics and to resolve discrepancies between theory and experiment.
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Demer, David A., and Stephane G. Conti. "Reconciling theoretical versus empirical target strengths of krill: effects of phase variability on the distorted-wave Born approximation." ICES Journal of Marine Science 60, no. 2 (2003): 429–34. http://dx.doi.org/10.1016/s1054-3139(03)00002-x.

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Abstract A model was recently proposed to predict the target strengths (TS) of Antarctic krill, Euphausia superba, versus incidence angle (θ) (Deep Sea Res. II 45(7) (1998) 1273). Based on the distorted-wave Born approximation (DWBA), the model depends on the coherent summation of scattering from elements of a discretized-bent cylinder. It was empirically validated at 120 kHz near-broadside incidence (θ≈90°), but large discrepancies were observed at other angles away from the main lobe. As the side-lobe measurements were both higher than the model predictions and above the noise floor, the authors noted that the differences were not entirely due to noise. In this study, the accuracy of the DWBA model is further explored. Results indicate that phase variability in the scatter from elements of a discretized-bent cylinder (krill model) causes a dramatic flattening in the side-lobe regions of TS(θ), while negligibly affecting the main scattering lobe. These results are consistent with the krill TS measurements reported by McGehee et al. Thus, by accounting for phase variability in the solution of the DWBA model, a more accurate and thus practical tool is developed for predicting krill TS.
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DUTTAMUDI, G., and S. K. ROY. "ON THE STICKING MECHANISM IN PRESENCE OF INELASTIC SCATTERING AND SELECTIVE ADSORPTION RESONANCES." International Journal of Modern Physics B 13, no. 12 (1999): 1477–87. http://dx.doi.org/10.1142/s0217979299001521.

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The sticking coefficients of He 4 on graphite and solid argon surfaces are calculated in presence of bound state resonances. It is observed that the over-counting of the scattering events which make the sticking coefficients greater than unity in these systems under usual distorted wave Born approximation (DWBA), can be removed by considering the exact T-matrix in presence of bound state resonances. This also gives rise to interesting results on temperature variation of sticking coefficients.
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Manik, Henry M. "Acoustic Observation of Zooplankton Using High Frequency Sonar (Observasi Akustik Zooplankton Menggunakan Sonar Frekuensi Tinggi)." ILMU KELAUTAN: Indonesian Journal of Marine Sciences 20, no. 2 (2015): 61. http://dx.doi.org/10.14710/ik.ijms.20.2.61-72.

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Underwater acoustic sampling techniques provide an advantage over traditional net-sampling for zooplankton research. The research presents a methodology for extracting both biological and physical information from high frequency sonar. These methods can easily provide the information that will improve our understanding of the spatial and temporal distribution of zooplankton. Measured acoustic data converted into biological organisms and numerical physics-based scattering models were used in this research. The numerical backscattering process was modeled using the Distorted-Wave Born Approximation (DWBA) to predict the amount of sound scattered by a weakly scattering animal. Both acoustic measurement and DWBA modeled scattering patterns showed that acoustic scattering levels are highly dependent on zooplankton orientation. The acoustic backscattering from zooplankton depends on the material properties (i.e. the sound speed and density of the zooplankton), the shape and size, and the orientation relative to the incident acoustic wave. DWBA model significantly improve the accuracy and precision of zooplankton acoustic surveys. Zooplankton data measurement and DWBA model analysis provide a basis for future acoustical studies.
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MADHUSOODHANAN, T., SAMIT MANDAL, M. P. SATHYAVATHIAMMA та ін. "WIDE-ANGLE α-t COINCIDENCE MEASUREMENT IN THE BREAKUP OF 7Li ON 27Al". International Journal of Modern Physics E 08, № 04 (1999): 347–54. http://dx.doi.org/10.1142/s0218301399000252.

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We have performed wide-angle in-plane coincidence measurements of the alpha particles and tritons emitted in the 48-MeV 7 Li projectile breakup reaction on 27 Al . The data have been analyzed using the post-form distorted-wave Born-approximation (DWBA) theory of breakup reactions where Coulomb and nuclear breakup as well as their interference terms are included. The theory is able to provide a good description of the experimental data particularly at large relative angles between the fragments. The interference between the Coulomb and nuclear breakup modes is found to be significant.
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Venkatakrishnan, S. V., Jeffrey Donatelli, Dinesh Kumar, et al. "A multi-slice simulation algorithm for grazing-incidence small-angle X-ray scattering." Journal of Applied Crystallography 49, no. 6 (2016): 1876–84. http://dx.doi.org/10.1107/s1600576716013273.

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Grazing-incidence small-angle X-ray scattering (GISAXS) is an important technique in the characterization of samples at the nanometre scale. A key aspect of GISAXS data analysis is the accurate simulation of samples to match the measurement. The distorted-wave Born approximation (DWBA) is a widely used model for the simulation of GISAXS patterns. For certain classes of sample such as nanostructures embedded in thin films, where the electric field intensity variation is significant relative to the size of the structures, a multi-slice DWBA theory is more accurate than the conventional DWBA method. However, simulating complex structures in the multi-slice setting is challenging and the algorithms typically used are designed on a case-by-case basis depending on the structure to be simulated. In this paper, an accurate algorithm for GISAXS simulations based on the multi-slice DWBA theory is presented. In particular, fundamental properties of the Fourier transform have been utilized to develop an algorithm that accurately computes the average refractive index profile as a function of depth and the Fourier transform of the portion of the sample within a given slice, which are key quantities required for the multi-slice DWBA simulation. The results from this method are compared with the traditionally used approximations, demonstrating that the proposed algorithm can produce more accurate results. Furthermore, this algorithm is general with respect to the sample structure, and does not require any sample-specific approximations to perform the simulations.
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Dissertations / Theses on the topic "DWBA (Distorted Wave Born Approximation"

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Cross, Brian. "Structure and break-up of one-neutron halo nuclei." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/843872/.

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This thesis concerns the use of nuclear reactions to study the structure of neutron-rich light nuclei. Emphasis is placed on 11Be which has been identified as a nucleus with a single neutron halo and which offers a simple 2-body case for detailed analysis. Comparisons are made with experimental data for the break-up of 11Be on gold, titanium and beryllium targets. As a prelude to more detailed work a simple elastic break-up model calculation, using the Distorted Wave Born Approximation (DWBA), is attempted. The resulting theoretical cross-sections show good agreement with the shape of the experimental data but cannot predict the absolute magnitude. A major part of the break-up work is a more accurate model using the post-form DWBA. The formulation is built up from basic scattering theory and includes details of employing the Zero Range Approximation and the Vincent and Fortune method of integration. A Finite Range Correction is also applied. Cross-section calculations for a gold target agree closely with experiment but a problem arises for lighter targets. Here the Coulomb potential must be excluded from the calculation to obtain a result that matches the experimental data. A method for the calculation of inelastic break-up is presented which only requires a small modification to the methods used for elastic break-up. As it suffers from the same light target problem only calculations for a gold target give an inclusive cross-section, produced from the elastic and inelastic contributions, which matches the experimental data satisfactorily. To overcome the light target problem a full recoil calculation is introduced. Arguments and analysis are produced to show that this method is too demanding of both computing time and storage for practicable implementation. Future calculations are proposed using an analytical method for Coulomb break-up.
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Adera, Gashaw Bekele. "Relativistic distorted wave analysis of neutrino-induced strange particle production on nuclei." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96081.

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Reiten, Andreas Lønning. "Diffuse Small Angle X-Ray Scattering From Thin Film Structures In the Distorted Wave Born Approximation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13379.

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The differential scattering cross section for diffuse scattering of X-rays from thinfilm structures is discussed within the framework of the distorted wave Born ap-proximation (DWBA). In contrast to the standard Born approximation (BA), thedistorted wave approach succeeds in calculating scattering from surfaces near thecritical angle of reflection. The method is particularly useful for studying averagesurface properties.Compromises made in the derivation of the model substantially simplify thefinal expression, but also limit its range of validity, which depends on the surfaceroot mean square roughness &#963; and the momentum transfer between the incidentand scattered X-rays perpendicular to the surface, Qz . The approximation is validso long as (Qz x &#963;) << 1.However, this is also the only regime where it is necessary togo beyond the simpler Born approximation.A computer simulation software based on the DWBA is implemented in Python.The implemented DWBA depends on the fractal dimension of the surface featuresthrough a parameter h (D = 3 &#8722; h) and an in-plane correlation cut off length &#950;.The various effects of changing key model parameters, among them &#950; and h, isdemonstrated. Comparison between experimental data and the DWBA modellooks promising although there are some challenges in relation to determiningthe fractal dimension.Finally, the feasibility of implementing the DWBA model in a multi-parameterfitting algorithm is discussed.
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de, Oliveira Santos F. "Détermination par réaction de transfert de largeurs alpha dans le fluor 19. Applications à l'astrophysique." Phd thesis, Université Paris Sud - Paris XI, 1995. http://tel.archives-ouvertes.fr/tel-01009384.

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La nucléosynthèse du fluor n'est pas encore clairement expliquée. Plusieurs scénarios prédisent que la réaction de capture alpha radiative sur l'azote 15 est la principale réaction de production de fluor. Dans l'expression du taux de cette réaction un paramètre essentiel est manquant, la largeur partielle alpha de la résonance sur le niveau d'énergie E = 4,377 MeV du fluor 19. Une mesure directe est exclue du fait de la très faible valeur attendue de la section efficace. Nous avons déterminé cette largeur alpha par le biais d'une réaction de transfert et une analyse en FR-DWBA (Finite Range Distorted Wave Born Approximation) dans un modèle simplifié de cluster alpha. Cette expérience a été effectuée avec un faisceau de lithium 7 accéléré à 28 MeV sur une cible gazeuse d'azote 15. Les 16 premiers niveaux du fluor ont été étudiés. Les facteurs spectroscopiques ont été extraits pour la majorité de ces niveaux. Les largeurs alpha des niveaux au-dessus du seuil ont été déterminées. Plusieurs largeurs alpha ont été comparées avec des valeurs publiées de mesures directes et l'écart reste dans la plage d'incertitude que nous avons estimée (facteur 2). La largeur alpha du niveau d'énergie E = 4,377 MeV a été déterminée, sa valeur est environ 60 fois plus faible que la valeur utilisée jusqu'à ce jour. L'influence de ce nouveau taux est observée principalement dans les étoiles dites AGB (Asymptotic Giant Branch) lors de phénomènes de pulsations thermiques. Dans ce modèle l'impact de nos mesures est sensible.
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Haynes, Matthew, and n/a. "Low Energy (e,2e) Studies of Inner Valence Ionization." Griffith University. Centre for Quantum Dynamics, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050902.142912.

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This thesis presents a series of electron impact ionization measurements on the gas phase targets of argon and krypton. The (e,2e) coincidence technique has been employed to measure the triple differential cross section (TDCS) using a new coincidence spectrometer designed to operate in the low energy regime (2 to 5 times the ionization energy) and in the coplanar geometry. The spectrometer is a conventional device utilizing a non-energy selected electron gun and two 1800 hemispherical electron analysers fitted with channel electron multipliers for detection of the outgoing electrons. A series of TDCS measurements were performed on the 3s inner-valence and 3p valence orbitals of argon employing coplanar asymmetric kinematics. Measurements for both orbitals were performed at an incident energy of 113.5 eV, ejected energies of 10, 7.5, 5 and 2 eV and a scattering angle of -15°. The energy of the scattered electron in each case was chosen to satis~' energy conservation and is dependent on the ionization energies of the different orbitals. The experimental cross sections are compared to theoretical TDCS calculations using the distorted wave Born approximation (DWBA) and variations of the DWBA in an attempt to investigate the role that post collisional interaction (PCI), polarization and electron exchange play in describing the TDCS in the low energy regime. To further extend this analysis, a series of TDCS measurements were performed on the 3s and 4s. orbitals of argon and krypton, respectively, employing coplanar symmetric kinematics. Measurements were performed for the 3s orbital at outgoing energies of 50, 20, 10 and 4eV and for the 4s orbital at outgoing energies of 85, 50, 20 and 10 eV. The kinematics were chosen to coincide with several of the (e,2e) measurements made in the same geometry on the 3p orbital of argon by Rouvellou et al (1998). The experimental results were again compared to a DWBA calculation and similar variations to those employed for the asymmetric measurements.
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Van, Zyl Johannes Jacobus. "Two-nucleon transfer in the 58Ni(p;3He)56Co reaction at incident energies of 80, 100 and 120 MeV." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71798.

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Mikulik, Petr. "Réflectivité des rayons X par des multicouches planaires et structurées." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10056.

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La reflectivite des rayons x par des multicouches planaires et structurees est presentee en utilisant differentes approches theoriques. Les phenomenes de diffusion etudies sont : la reflectivite speculaire par des multicouches planaires ayant diverses sequences d'empilement (monocouche, periodique, quasiperiodique), la diffusion diffuse de multicouches rugueuses, et enfin la diffusion par des reseaux de surface et par des reseaux de multicouche. Les theories employees pour les calculs : la theorie cinematique, l'approximation de l'onde deformee de born, la theorie dynamique, et plusieurs approximations de la theorie dynamique (approximation a une reflexion unique, approximation a deux ondes et approximation a diffusion multiple), sont developpees dans un formularisme unique. Ce formalisme permet de discuter et de comparer toutes les theories d'une maniere solide et methodologique. Les calculs numeriques sont appliques pour l'ajustement des courbes experiementales pour mettre en evidence les parametres structuraux des divers systemes multicouches.
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Akhtar, Shamim. "Study of the 12C(α,γ)16O Reaction via the α-Transfer Reactions: 12C(6Li,d)16O and 12C(7Li,t)16O". Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1471384669.

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Chak, Tong Chan Anthony. "Distorted Wave Born Approximation For Inelastic Atomic Collision." Thesis, 2007. http://hdl.handle.net/10012/3131.

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An investigation of the problem of inelastic scattering process under the Coulomb Born approximation is given. Different approaches to calculate Coulomb wavefunctions in the momentum space representation are analyzed and a discussion of their existences in the generalized distribution sense is provided. Inokuti’s approach of finding the differential cross section in the momentum space representation under the Coulomb Born approximation is described and a different approach with an application of the Bremsstrahlung integral is developed and compared with Inokuti’s approach.
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Lisa, Nyameko. "Theoretical and computational considerations of Quasi-Free (p; 2p) reactions using the distorted-wave impulse approximation and Monte Carlo simulations in Geant4." Diss., 2014. http://hdl.handle.net/10500/18610.

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Under current investigation is the re-implementation of the Distorted-Wave Impulse Approximation (DWIA), originally formulated in FORTRAN by N.S. Chant and P.G. Roos, with the intention of developing it in a portable Python environment. This will be complimented by developing a GEANT4 detector simulation application. These two techniques will be used to model the (p,2p) proton knock-out reaction 40Ca(p; 2p)39K (2.52 MeV)1 2 + first excited state, at intermediate incident energies of 150 MeV. This study is a test-bed that lays the foundation and platform from which one may develop an interactive workbench and toolkit in GEANT4 which: (i.) accurately models an accelerator-detector experimental set-up, such as those found at iThemba Labs, and (ii.) incorporates the DWIA formalism as a built-in physics process within the framework of GEANT4. Furthermore the Python modules developed for the specific proton knock-out reaction studied here, can be generalized for an arbitrary set of nuclear scattering reactions and packaged as a suite of scientific Python codes.<br>Theoretical and Computational Nuclear Physics<br>M. Sc. (Theoretical and Computational Nuclear Physics)
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Book chapters on the topic "DWBA (Distorted Wave Born Approximation"

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Kunz, P. D., and E. Rost. "The Distorted-Wave Born Approximation." In Computational Nuclear Physics 2. Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4613-9335-1_5.

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Alavi, A., F. C. Lin, M. A. Fiddy, and C. L. Byrne. "Image Estimation from Scattered Field Data (at 10 GHz) Using the Distorted Wave Born Approximation and Other Prior Knowledge." In Inverse Problems and Theoretical Imaging. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75298-8_40.

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"Distorted-Wave Born Approximation." In Direct Nuclear Reactions. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812562104_0005.

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Conference papers on the topic "DWBA (Distorted Wave Born Approximation"

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Kampp, Marco. "The role of final state potentials in the distorted-wave Born approximation calculation of inner-shell ionization processes." In CORRELATIONS,POLARIZATION,AND IONIZATION IN ATOMIC SYSTEMS:Proceedings of the International Symposium on(e,2e),Double Photoionization and Related Topics and the Eleventh International Symposium on Polarization and Correlation in Electronic and Atomic .... AIP, 2002. http://dx.doi.org/10.1063/1.1449351.

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