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首页> 美国政府科技报告 >Elastic Scattering of Protons by sup 16 O, sup 40 Ca and sup 208 Pb at 200, 500 and 800 MeV: 1, Relativistic and Nonrelativistic Analyses Based on the Impulse Approximation
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Elastic Scattering of Protons by sup 16 O, sup 40 Ca and sup 208 Pb at 200, 500 and 800 MeV: 1, Relativistic and Nonrelativistic Analyses Based on the Impulse Approximation

机译：通过sup 16 O，sup 40 Ca和sup 208 pb在200,500和800 meV下的质子的弹性散射：1，基于脉冲近似的相对论和非相对论分析

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Systematics of Dirac impulse approximation predictions for cross sections and spin observables in elastic proton scattering by sup 16 O, sup 40 Ca and sup 208 Pb at energies of 200, 500 and 800 MeV are presented. The analysis is based on an optical potential constructed from complete sets of Lorentz invariant NN amplitudes. The NN amplitudes are determined from a relativistic meson exchange model of the nuclear force. Comparisons are made with the original form of the Dirac impulse approximation, which is based on five Fermi terms to represent the NN interaction, and with the Schroedinger form of the impulse approximation. For the Dirac analyses, there is implicit coupling to virtual nucleon-antinucleon states. In order to illustrate these contributions, the Dirac equation is recast in the form of the Schroedinger equation and the resulting Schroedinger potentials are separated into ''no-pair'' and virtual-pair parts. The resulting virtual-pair part of the central potential is typically 25 MeV at the center of the nucleus for 200 MeV to 800 MeV protons. A reasonable description of the experimental data is obtained over a broad energy range and over a wide variation of nuclear size when the analysis is based on complete sets of Lorentz-invariant amplitudes. 34 refs., 23 figs. (ERA citation 13:019896)

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