TY - JOUR
T1 - Mesonic effects deduced from good-resolution (3He, t) reaction in comparison with inelastic scatterings
AU - Fujita, Y.
AU - Akimune, H.
AU - Daito, I.
AU - Fujiwara, M.
AU - Harakeh, M. N.
AU - Inomata, T.
AU - Jänecke, J.
AU - Katori, K.
AU - Lüttge, C.
AU - Nakayama, S.
AU - Von Neumann-Cosel, P.
AU - Richter, A.
AU - Tamii, A.
AU - Tanaka, M.
AU - Ueno, H.
AU - Yosoi, M.
PY - 1998/1/11
Y1 - 1998/1/11
N2 - Gamow-Teller (GT) states excited by a charge-exchange reaction on N = Z nuclei with ground-state isospin T = 0 have isospin T = 1, while M1 states excited by inelastic scattering of electrons or protons can have either T = 0 or T = 1. The latter are the isobaric analog states of the GT states. By comparing the GT states observed in the good-resolution (3He, t) reaction at 150 MeV/u with the M1 states observed in inelastic proton reactions, the isospin of each 1+ state in 28Si was determined. Furthermore, by comparing results from electron inelastic scattering induced by electro-magnetic M1 operator, different response of nucleus depending on different interaction is investigated. Based on these comparisons among different probes, we discuss (1) the contribution of the "Δ-h excitation" mechanism in the quenching of magnetic excitations; (2) the effects of meson exchange currents; and (3) the orbital contribution in the M1 operator.
AB - Gamow-Teller (GT) states excited by a charge-exchange reaction on N = Z nuclei with ground-state isospin T = 0 have isospin T = 1, while M1 states excited by inelastic scattering of electrons or protons can have either T = 0 or T = 1. The latter are the isobaric analog states of the GT states. By comparing the GT states observed in the good-resolution (3He, t) reaction at 150 MeV/u with the M1 states observed in inelastic proton reactions, the isospin of each 1+ state in 28Si was determined. Furthermore, by comparing results from electron inelastic scattering induced by electro-magnetic M1 operator, different response of nucleus depending on different interaction is investigated. Based on these comparisons among different probes, we discuss (1) the contribution of the "Δ-h excitation" mechanism in the quenching of magnetic excitations; (2) the effects of meson exchange currents; and (3) the orbital contribution in the M1 operator.
KW - Good-resolution (He, t) reaction
KW - Isospin structure
KW - Meson exchange current
KW - Orbital current
KW - Quenching of Gamow-Teller strengths
UR - http://www.scopus.com/inward/record.url?scp=0031646408&partnerID=8YFLogxK
U2 - 10.1016/S0168-9002(97)00865-6
DO - 10.1016/S0168-9002(97)00865-6
M3 - Article
AN - SCOPUS:0031646408
SN - 0168-9002
VL - 402
SP - 371
EP - 377
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2-3
ER -