Energy Dependence of the Nucleon-nucleus Optical Potential Via Neutron Scattering PDF Download
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Author: Tarlok Singh Cheema
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 376
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Book Description
Author: Tarlok Singh Cheema
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 376
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Neutron differential-elastic-scattering cross sections of niobium were measured from 1.5 to 10.0 MeV at intervals of less than or equal to200 keV below 4.0 MeV, and of approx. =500 keV from 4.0 to 10.0 MeV. Ten to more than fifty differential-cross-section values were determined at each incident energy, distributed over the angular range approx. =20 to 160°. The observed values were interpreted in the context of the spherical optical-statistical model. It was found that the volume integral of the real potential decreased with energy whereas the integral of the imaginary part increased. The energy dependence in both cases was consistent with a linear variation. There is a dispersion relationship between the real and imaginary potentials, and when this was used, in conjunction with the experimental imaginary potential, it was possible to predict the observed energy dependence of the real potential to a good degree of accuracy, thus supporting the consistency of the data and its analysis. The real-potential well depths needed to give the correct binding energies of the 2d52, 3s12, 2d32 and 1g--2 particle states and of the 1g92 hole state are in reasonable agreement with those given by a linear extrapolation of the scattering potential. However, the well depths needed to give the observed binding of the 2p32, 1f52 and 2p12 hole states are about 10% less than the extrapolated values. 40 refs., 5 figs.
Author: Juan C. Ferrer
Publisher:
ISBN:
Category : Isobaric spin
Languages : en
Pages : 308
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Book Description
Author: Robert Wayne Manweiler
Publisher:
ISBN:
Category : Nuclear optical models
Languages : en
Pages : 278
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Book Description
Author: Theodore B. Taylor
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 138
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
The authors report on the development of new global optical model potentials for nucleon-nucleus scattering at medium energies. Using both Schroedinger and Dirac scattering formalisms, the goal is to construct a physically realistic optical potential describing nucleon-nucleus elastic scattering observables for a projectile energy range of (perhaps) 20 meV to (perhaps) 2 GeV and a target mass range of 16 to 209, excluding regions of strong nuclear deformation. They use a phenomenological approach guided by conclusions from recent microscopic studies. The experimental database consists largely of proton-nucleus elastic differential cross sections, analyzing powers, spin-rotation functions, and total reaction cross sections, and neutron-nucleus total cross sections. They will use this database in a nonlinear least-squares adjustment of optical model parameters in both relativistic equivalent Schroedinger (including relativistic kinematics) and Dirac (second-order reduction) formalisms. Isospin will be introduced through the standard Lane model and a relativistic generalization of that model.
Author: D. M. Patterson
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
A global, energy-dependent, Lane-model, nucleon-nucleus optical potential has been determined by fitting (p, n)-IAS angular distributions between 25 and 45 MeV while maintaining the fit obtained by Becchetti and Greenlees to proton elastic-scattering data over a wide mass and energy range, thus firmly establishing the essential validity of the Lane model for nucleon-nucleus optical potentials.
Author: Robert R. Johnston
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 182
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Book Description
Author: Peter Edward Hodgson
Publisher: World Scientific
ISBN: 9789810217228
Category : Science
Languages : en
Pages : 440
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Book Description
The nucleon optical model is widely used to calculate the elastic scattering cross-sections and polarisations for the interaction of neutrons and protons with atomic nuclei. The optical model potentials not only describe the scattering but also provide the wave functions needed to analyse a wide range of nuclear reactions. They also unify many aspects of nuclear reactions and nuclear structure. This book consists of a comprehensive introduction to the subject and a selection of papers by the author describing the optical model in detail. It contains full references to the original literature with many examples of the application of the model to the analysis of experimental data.
Author:
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Category :
Languages : en
Pages :
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Book Description
Initial results are presented for the determination of a global medium-energy nucleon-nucleus phenomenological optical-model potential using a relativistic Schroedinger representation. The starting point for this work is the global phenomenological optical-model potential of Schwandt)ital et al.), which is based on measured elastic scattering cross sections and analyzing power for polarized protons ranging from 80 to 180 MeV. This potential is optimally modified to reproduce experimental proton reaction cross sections as a function of energy, while allowing only minimal deterioration in the fits to the elastic cross sections and analyzing powers. Further modifications in the absorptive potential were found necessary to extrapolate the modified potential to higher energies. The final potential is converted to a neutron-nucleus potential by use of standard Lane model assumptions and by accounting approximately for the Coulomb correction. Comparisons of measured and calculated proton reaction and neutron total cross sections are presented for 27Al, 56Fe, and 2°8Pb. Medium-energy optical-model potentials for complex projectiles are briefly discussed in an appendix. 7 refs., 20 figs.
