https://www.cns.s.u-tokyo.ac.jp/~shimoura/research/nuc_data/pdf/11.pdf

Energy levels of light nuclei A = 11-12

Within the relativistic plane-wave impulse approximation, the sensitivity of complete sets of quasielastic proton-nucleus spin observables is investigated with respect to relativistic effects, the importance of exchange contributions to the [ital NN] amplitudes, the form of the [pi][ital N] vertex, and spin-orbit distortions. Calculations are performed at laboratory energies ranging from 135 to 500 MeV and for target nuclei ranging from [sup 12]C to [sup 208]Pb at a fairly large fixed momentum transfer of 1.97 fm[sup [minus]1]. Of all the spin observables, only [ital A][sub [ital y]] exhibits a clear relativistic effect at the highest energy, as has been previously found. However, at the lower energies (200 MeV and below) the relativistic effect shifts to two other polarization transfer observables, mainly [ital D][sub [ital s][prime][ital s]] and to a lesser extent [ital D][sub [ital l][prime][ital s]]. In addition, it is found that [ital D][sub [ital n][prime][ital n]] is extremely sensitive to the pseudoscalar versus pseudovector ambiguity of the [pi][ital N] vertex, whereas [ital D][sub [ital s][prime][ital l]] and [ital D][sub [ital l][prime][ital l]] are sensitive to exchange contributions to the [ital NN] amplitudes. Compared to the latter, the effects of spin-orbit distortion are not insignificantly small and had to bemore » corrected for. This investigation stresses the urgent need for measurements of the quasielastic spin observables at these low energies.« less

Relativistic effects on polarization transfer observables for quasielastic proton-nucleus scattering.

Based on the relativistic plane-wave impulse approximation for quasielastic ({rvec p},{rvec p}{sup {prime}}) and ({rvec p},{rvec n}) polarization observables, we provide quantitative estimates of nuclear medium modifications of the NN interaction. We employ a {sup 40}Ca target for proton energies ranging from 135 to 300 MeV at a momentum transfer of 1.97 fm{sup {minus}1}. Compared to former calculations, we have generated new meson-exchange parameters for the relativistic NN amplitudes between 80 and 200 MeV. Finally, the results are compared to the limited available data. {copyright} {ital 1998} {ital The American Physical Society}

https://arxiv.org/pdf/nucl-th/9704049.pdf

Nuclear medium modifications of the NN interaction via quasielastic ({rvec p},{rvec p}{sup {prime}}) and ({rvec p},{rvec n}) scattering

For the calculation of polarization transfer observables for quasielastic scattering of protons on nuclei, a formalism in the context of the Relativistic Plane Wave Impulse Approximation is developed, in which the interaction matrix is expanded in terms of a complete set of 44 independent invariant amplitudes. A boson-exchange model is used to predict the 39 amplitudes which were omitted in the formerly used five-term parameterization(the SPVAT form) of the nucleon-nucleon scattering matrix. Use of the complete set of amplitudes eliminates the arbitrariness of the five-term representation.

Polarization transfer observables for quasielastic proton-nucleus scattering in terms of a complete Lorentz invariant representation of the NN scattering matrix

Quasifree analyzing powers using the (p

The peripheral nature of quasielastic scattering is addressed. The authors compare the spin observables P, Dn'n'Ds's and Dl's for inclusive quasielastic proton scattering from 12C with that from 16O at an incident energy of 420 meV and a central momentum transfer of 1.97 fm-1. The similarity between the respective observables is remarkable.

Comparison of inclusive quasielastic 12C(p,p') and 16O(p,p') spin observables

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Comparison of inclusive quasielastic 12C(p,p') and 16O(p,p') spin observables