TY - JOUR

T1 - Study of nuclear correlation effects via 12C (over(p, →), over(n, →)) 12N (g.s., 1+) at 296 MeV

AU - Wakasa, T.

AU - Dozono, M.

AU - Ihara, E.

AU - Asaji, S.

AU - Fujita, K.

AU - Hatanaka, K.

AU - Ichimura, M.

AU - Ishida, T.

AU - Kaneda, T.

AU - Matsubara, H.

AU - Nagasue, Y.

AU - Noro, T.

AU - Sakemi, Y.

AU - Shimizu, Y.

AU - Takeda, H.

AU - Tameshige, Y.

AU - Tamii, A.

AU - Yamada, Y.

PY - 2007/11/15

Y1 - 2007/11/15

N2 - We report measurements of the cross section and a complete set of polarization observables for the Gamow-Teller 12C (over(p, →), over(n, →)) 12N (g.s., 1+) reaction at a bombarding energy of 296 MeV. The data are compared with distorted wave impulse approximation calculations employing transition form factors normalized to reproduce the observed beta-decay ft value. The cross section is significantly under-predicted by the calculations at momentum transfers q ≳ 0.5 fm-1. The discrepancy is partly resolved by considering the non-locality of the nuclear mean field. However, the calculations still under-predict the cross section at large momentum transfers of q ≃ 1.6 fm-1. We also performed calculations employing random phase approximation response functions and found that the observed enhancement can be attributed in part to pionic correlations in nuclei.

AB - We report measurements of the cross section and a complete set of polarization observables for the Gamow-Teller 12C (over(p, →), over(n, →)) 12N (g.s., 1+) reaction at a bombarding energy of 296 MeV. The data are compared with distorted wave impulse approximation calculations employing transition form factors normalized to reproduce the observed beta-decay ft value. The cross section is significantly under-predicted by the calculations at momentum transfers q ≳ 0.5 fm-1. The discrepancy is partly resolved by considering the non-locality of the nuclear mean field. However, the calculations still under-predict the cross section at large momentum transfers of q ≃ 1.6 fm-1. We also performed calculations employing random phase approximation response functions and found that the observed enhancement can be attributed in part to pionic correlations in nuclei.

KW - Gamow-Teller 1 state

KW - Nuclear correlation

KW - Polarization transfer measurement

UR - http://www.scopus.com/inward/record.url?scp=35548963328&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35548963328&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2007.10.017

DO - 10.1016/j.physletb.2007.10.017

M3 - Article

AN - SCOPUS:35548963328

VL - 656

SP - 38

EP - 44

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1-3

ER -