dorsal/arxiv
View SchemaNuclear medium modifications of the NN interaction via quasielastic ($\vec p,\vec p '$) and ($\vec{p},\vec{n}$) scattering
| Authors | G. C. Hillhouse, B. I. S van der Ventel, S. M. Wyngaardt, P. R. de Kock |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9704049 |
| URL | https://arxiv.org/abs/nucl-th/9704049 |
| DOI | 10.1103/PhysRevC.57.448 |
Abstract
Within the relativistic PWIA, spin observables have been recalculated for quasielastic ($\vec p,\vec p '$) and ($\vec p,\vec n$) reactions on a $^{40}$Ca target. The incident proton energy ranges from 135 to 300 MeV while the transferred momentum is kept fixed at 1.97 fm^{-1}. In the present calculations, new Horowitz-Love--Franey relativistic NN amplitudes have been generated in order to yield improved and more quantitative spin observable values than before. The sensitivities of the various spin observables to the NN interaction parameters, such as (1) the presence of the surrounding nuclear medium, (2) a pseudoscalar versus a pseudovector interaction term, and (3) exchange effects, point to spin observables which should preferably be measured at certain laboratory proton energies, in order to test current nuclear models. This study also shows that nuclear medium effects become more important at lower proton energies ($\leq$ 200 MeV). A comparison to the limited available data indicates that the relativistic parametrization of the NN scattering amplitudes in terms of only the five Fermi invariants (the SVPAT form) is questionable.
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"abstract": "Within the relativistic PWIA, spin observables have been recalculated for\nquasielastic ($\\vec p,\\vec p \u0027$) and ($\\vec p,\\vec n$) reactions on a $^{40}$Ca\ntarget. The incident proton energy ranges from 135 to 300 MeV while the\ntransferred momentum is kept fixed at 1.97 fm^{-1}. In the present\ncalculations, new Horowitz-Love--Franey relativistic NN amplitudes have been\ngenerated in order to yield improved and more quantitative spin observable\nvalues than before. The sensitivities of the various spin observables to the NN\ninteraction parameters, such as (1) the presence of the surrounding nuclear\nmedium, (2) a pseudoscalar versus a pseudovector interaction term, and (3)\nexchange effects, point to spin observables which should preferably be measured\nat certain laboratory proton energies, in order to test current nuclear models.\nThis study also shows that nuclear medium effects become more important at\nlower proton energies ($\\leq$ 200 MeV). A comparison to the limited available\ndata indicates that the relativistic parametrization of the NN scattering\namplitudes in terms of only the five Fermi invariants (the SVPAT form) is\nquestionable.",
"arxiv_id": "nucl-th/9704049",
"authors": [
"G. C. Hillhouse",
"B. I. S van der Ventel",
"S. M. Wyngaardt",
"P. R. de Kock"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.57.448",
"title": "Nuclear medium modifications of the NN interaction via quasielastic ($\\vec p,\\vec p \u0027$) and ($\\vec{p},\\vec{n}$) scattering",
"url": "https://arxiv.org/abs/nucl-th/9704049"
},
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