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

G. C. Hillhouse, P. R. De Kock

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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 NN amplitudes, the form of the πN vertex, and spin-orbit distortions. Calculations are performed at laboratory energies ranging from 135 to 500 MeV and for target nuclei ranging from C12 to Pb208 at a fairly large fixed momentum transfer of 1.97 fm-1. Of all the spin observables, only Ay 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 Ds′s and to a lesser extent Dl′s. In addition, it is found that Dn′n is extremely sensitive to the pseudoscalar versus pseudovector ambiguity of the πN vertex, whereas Ds′l and Dl′l are sensitive to exchange contributions to the NN amplitudes. Compared to the latter, the effects of spin-orbit distortion are not insignificantly small and had to be corrected for. This investigation stresses the urgent need for measurements of the quasielastic spin observables at these low energies.

Original languageEnglish
Pages (from-to)391-400
Number of pages10
JournalPhysical Review C
Volume49
Issue number1
DOIs
Publication statusPublished - Jan 1 1994

Fingerprint

relativistic effects
nuclei
protons
polarization
scattering
apexes
orbits
energy
ambiguity
momentum transfer
impulses
plane waves
sensitivity
shift
approximation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

@article{c0460c7d6f7b4332ac088ab4358ba36b,
title = "Relativistic effects on polarization transfer observables for quasielastic proton-nucleus scattering",
abstract = "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 NN amplitudes, the form of the πN vertex, and spin-orbit distortions. Calculations are performed at laboratory energies ranging from 135 to 500 MeV and for target nuclei ranging from C12 to Pb208 at a fairly large fixed momentum transfer of 1.97 fm-1. Of all the spin observables, only Ay 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 Ds′s and to a lesser extent Dl′s. In addition, it is found that Dn′n is extremely sensitive to the pseudoscalar versus pseudovector ambiguity of the πN vertex, whereas Ds′l and Dl′l are sensitive to exchange contributions to the NN amplitudes. Compared to the latter, the effects of spin-orbit distortion are not insignificantly small and had to be corrected for. This investigation stresses the urgent need for measurements of the quasielastic spin observables at these low energies.",
author = "Hillhouse, {G. C.} and {De Kock}, {P. R.}",
year = "1994",
month = "1",
day = "1",
doi = "10.1103/PhysRevC.49.391",
language = "English",
volume = "49",
pages = "391--400",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "1",

}

Relativistic effects on polarization transfer observables for quasielastic proton-nucleus scattering. / Hillhouse, G. C.; De Kock, P. R.

In: Physical Review C, Vol. 49, No. 1, 01.01.1994, p. 391-400.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Relativistic effects on polarization transfer observables for quasielastic proton-nucleus scattering

AU - Hillhouse, G. C.

AU - De Kock, P. R.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - 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 NN amplitudes, the form of the πN vertex, and spin-orbit distortions. Calculations are performed at laboratory energies ranging from 135 to 500 MeV and for target nuclei ranging from C12 to Pb208 at a fairly large fixed momentum transfer of 1.97 fm-1. Of all the spin observables, only Ay 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 Ds′s and to a lesser extent Dl′s. In addition, it is found that Dn′n is extremely sensitive to the pseudoscalar versus pseudovector ambiguity of the πN vertex, whereas Ds′l and Dl′l are sensitive to exchange contributions to the NN amplitudes. Compared to the latter, the effects of spin-orbit distortion are not insignificantly small and had to be corrected for. This investigation stresses the urgent need for measurements of the quasielastic spin observables at these low energies.

AB - 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 NN amplitudes, the form of the πN vertex, and spin-orbit distortions. Calculations are performed at laboratory energies ranging from 135 to 500 MeV and for target nuclei ranging from C12 to Pb208 at a fairly large fixed momentum transfer of 1.97 fm-1. Of all the spin observables, only Ay 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 Ds′s and to a lesser extent Dl′s. In addition, it is found that Dn′n is extremely sensitive to the pseudoscalar versus pseudovector ambiguity of the πN vertex, whereas Ds′l and Dl′l are sensitive to exchange contributions to the NN amplitudes. Compared to the latter, the effects of spin-orbit distortion are not insignificantly small and had to be corrected for. This investigation stresses the urgent need for measurements of the quasielastic spin observables at these low energies.

UR - http://www.scopus.com/inward/record.url?scp=0001738933&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001738933&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.49.391

DO - 10.1103/PhysRevC.49.391

M3 - Article

AN - SCOPUS:0001738933

VL - 49

SP - 391

EP - 400

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 1

ER -