Isovector effective NN interaction in 28Si (over(p, →), over(n, →)) 28P (6-) at 198 MeV

T. Wakasa, Y. Hagihara, T. Noro, T. Ishida, S. Asaji, Y. Nagasue, K. Hatanaka, Y. Sakemi, A. Tamii, Y. Shimizu, K. Fujita, Y. Tameshige, H. Sakai, H. Kuboki, M. Sasano, M. Ichimura, H. Kamada, M. Yamaguchi

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Abstract

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.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume645
Issue number5-6
DOIs
Publication statusPublished - Feb 22 2007

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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