We report measurements of the cross section and a complete set of polarization observables for the 28Si (over(p, →), over(n, →)) 28P (6-) reaction at a bombarding energy of 198 MeV. The data are compared with distorted wave impulse approximation calculations employing response functions normalized to inelastic electron scattering. The spin-longitudinal polarized cross section I Dq is slightly over-predicted by the calculations, while the normal spin-transverse polarized cross section I Dn is significantly under-predicted. The calculated in-plane spin-transverse I Dp and spin-scalar I D0 polarized cross sections agree well with the experimental data. These results are consistent with those for 28Si (over(p, →), over(p, →)′) 28Si (6-, T = 1) scattering at the same energy, and thus it is concluded that isospin-mixing effects are not responsible for the discrepancy between theory and experiment in the (over(p, →), over(p, →)′) case. Energy half-off-shell effects as medium effects on the effective nucleon-nucleon interaction are also investigated and found to be too small to be responsible for the discrepancy.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - Feb 22 2007|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics