TY - JOUR
T1 - Isovector effective NN interaction in 28Si (over(p, →), over(n, →)) 28P (6-) at 198 MeV
AU - Wakasa, T.
AU - Hagihara, Y.
AU - Noro, T.
AU - Ishida, T.
AU - Asaji, S.
AU - Nagasue, Y.
AU - Hatanaka, K.
AU - Sakemi, Y.
AU - Tamii, A.
AU - Shimizu, Y.
AU - Fujita, K.
AU - Tameshige, Y.
AU - Sakai, H.
AU - Kuboki, H.
AU - Sasano, M.
AU - Ichimura, M.
AU - Kamada, H.
AU - Yamaguchi, M.
N1 - Funding Information:
We thank the RCNP cyclotron crew for providing a good quality beam for our experiments. This work was supported in part by the Grants-in-Aid for Scientific Research Nos. 14702005 and 16654064 of the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
PY - 2007/2/22
Y1 - 2007/2/22
N2 - 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.
AB - 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.
KW - Isovector effective interaction
KW - Polarization transfer measurement
KW - Stretched 6 state
UR - https://www.scopus.com/pages/publications/33846616898
UR - https://www.scopus.com/pages/publications/33846616898#tab=citedBy
U2 - 10.1016/j.physletb.2006.12.069
DO - 10.1016/j.physletb.2006.12.069
M3 - Article
AN - SCOPUS:33846616898
SN - 0370-2693
VL - 645
SP - 402
EP - 407
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 5-6
ER -