Electron-deuteron tensor polarization and the two-nucleon force
Sep, 198018 pages
Published in:
- Phys.Rev.C 22 (1980) 1285-1303
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Abstract: (APS)
Electron-deuteron scattering observables, including the tensor polarizations T20, T2±1, T2±2, are calculated for a variety of N−N potential models. The main goal is to determine how the tensor polarization experiments can help distinguish competing potential models with respect to off-shell behavior and tensor force strength. The pair meson-exchange-current correction of Gari and Hyuga is included in the analysis as well as a correction suggested by Friar for energy-dependent potentials. It is found that whereas electron-deuteron elastic scattering cross sections do not readily distinguish different potentials, the tensor polarizations do. The tensor polarization T20 mainly distinguishes potentials with different deuteron s-wave momentum distributions, but does not distinguish potentials with different d-state probabilities (PD). The tensor polarization T2±1, since it factors essentially into a product of the magnetic and quadrupole form factors, allows for the extraction of the quadrupole form factor which is closely related to the tensor force strength and PD. The tensor polarization T2±2 is completely determined by the elastic scattering cross sections and magnetic form factor, and yields no additional information on the N−N force unobtainable from elastic scattering measurements. The tensor polarizations T20 and T21 have maximum values of order unity in the region q=2 to 5 fm−1. The calculations indicate that measurements of T20 for 2≲q≲5 fm−1, and T2±1 for 3≲q≲5 fm−1 could yield important information on the off-shell behavior and tensor force strength. The meson-exchange-current and energy-dependence corrections are important and must be taken into account to extract potential properties from such experiments.
NUCLEAR STRUCTURE H2: form factors, tensor polarization calculated: dependence on off-shell behavior and PD; seven potential models; pair currents included.References(46)
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