TY - JOUR
T1 - Nucleonic versus nuclear spin-isospin polarization
T2 - A study of the 48Ca and 88Sr M1 form factors
AU - Härting, A.
AU - Kohno, M.
AU - Weise, W.
N1 - Funding Information:
’ Work supported in part by Deutsche Forschungsgemeinschaft ministerium fur Forschung und Technologie (grant MEP 33 REA).
PY - 1984/6/4
Y1 - 1984/6/4
N2 - We compare standard nuclear polarization mechanisms, Δ-hole-polarization and meson-exchange-current effects in the q-dependent quenching of isovector spin transitions. Calculations are performed for the M1-transition form factors of the 1+ states in 48Ca (10.23 MeV) and 88Sr (3.48 MeV). We obtain a satisfactory description of both form factors if the repulsive part of the residual interaction in the Δ-hole channel is of similar strength to that in the nucleon-hole channel. Meson-exchange currents lead to an enhancement of M1 transitions by an amount which is small in general, but sensitive to the particular nuclear state involved.
AB - We compare standard nuclear polarization mechanisms, Δ-hole-polarization and meson-exchange-current effects in the q-dependent quenching of isovector spin transitions. Calculations are performed for the M1-transition form factors of the 1+ states in 48Ca (10.23 MeV) and 88Sr (3.48 MeV). We obtain a satisfactory description of both form factors if the repulsive part of the residual interaction in the Δ-hole channel is of similar strength to that in the nucleon-hole channel. Meson-exchange currents lead to an enhancement of M1 transitions by an amount which is small in general, but sensitive to the particular nuclear state involved.
UR - http://www.scopus.com/inward/record.url?scp=48549114490&partnerID=8YFLogxK
U2 - 10.1016/0375-9474(84)90665-1
DO - 10.1016/0375-9474(84)90665-1
M3 - Article
AN - SCOPUS:48549114490
SN - 0375-9474
VL - 420
SP - 399
EP - 422
JO - Nuclear Physics, Section A
JF - Nuclear Physics, Section A
IS - 3
ER -