Validity of the relativistic impulse approximation for elastic proton-nucleus scattering at energies lower than 200 MeV

Journal Article · Tue Jul 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.014603· OSTI ID:21192040

Li, Z P ^[1]; Hillhouse, G C ^[1]; Meng, J ^[1]

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1. School of Physics, Peking University, Beijing 100871 (China)

We present the first study to examine the validity of the relativistic impulse approximation (RIA) for describing elastic proton-nucleus scattering at incident laboratory kinetic energies lower than 200 MeV. For simplicity we choose a {sup 208}Pb target, which is a spin-saturated spherical nucleus for which reliable nuclear structure models exist. Microscopic scalar and vector optical potentials are generated by folding invariant scalar and vector scattering nucleon-nucleon (NN) amplitudes, based on our recently developed relativistic meson-exchange model, with Lorentz scalar and vector densities resulting from the accurately calibrated PK1 relativistic mean field model of nuclear structure. It is seen that phenomenological Pauli blocking (PB) effects and density-dependent corrections to {sigma}N and {omega}N meson-nucleon coupling constants modify the RIA microscopic scalar and vector optical potentials so as to provide a consistent and quantitative description of all elastic scattering observables, namely, total reaction cross sections, differential cross sections, analyzing powers and spin rotation functions. In particular, the effect of PB becomes more significant at energies lower than 200 MeV, whereas phenomenological density-dependent corrections to the NN interaction also play an increasingly important role at energies lower than 100 MeV.

• OSTI ID: 21192040
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
BOSON-EXCHANGE MODELS
CHANNELING
CORRECTIONS
DENSITY
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
IMPULSE APPROXIMATION
KINETIC ENERGY
LEAD 208 TARGET
MEAN-FIELD THEORY
MESON-NUCLEON INTERACTIONS
MEV RANGE 100-1000
NUCLEAR STRUCTURE
NUCLEONS
POLARIZATION-ASYMMETRY RATIO
PROTON-NUCLEON INTERACTIONS
RELATIVISTIC RANGE
SPHERICAL CONFIGURATION
SPIN