Energy dependence of the NN t matrix in the optical potential for elastic nucleon-nucleus scattering

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.57.189· OSTI ID:565985

Elster, C; Weppner, S P ^[1]

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1. Institute of Nuclear and Particle Physics, and Department of Physics, Ohio University, Athens, Ohio 45701 (United States)

The influence of the energy dependence of the free NN t matrix on the optical potential of nucleon-nucleus elastic scattering is investigated within the context of a full-folding model based on the impulse approximation. The treatment of the pole structure of the NN t matrix, which has to be taken into account when integrating to negative energies, is described in detail. We calculate proton-nucleus elastic scattering observables for {sup 16}O, {sup 40}Ca, and {sup 208}Pb between 65 and 200 MeV laboratory energy and study the effect of the energy dependence of the NN t matrix. We compare this result with experiment and with calculations where the center-of-mass energy of the NN t matrix is fixed at half the projectile energy. It is found that around 200 MeV the fixed energy approximation is a very good representation of the full calculation; however, deviations occur when going to lower energies (65 MeV). {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 565985
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 57; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCIUM 40 TARGET
CENTER-OF-MASS SYSTEM
ELASTIC SCATTERING
ENERGY DEPENDENCE
FOLDING MODEL
IMPULSE APPROXIMATION
LEAD 208 TARGET
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
OPTICAL MODELS
S MATRIX