A shell-model study ofA=48?52 nuclei and magnetic strength distributions in50Ti

Abstract

An extensive shell-model calculation has been performed on five fp-shell nuclei in the mass region A = 48-52. The model space, which includes lp-1 h excitations, reproduces the experimental spectra very well except for the 0~-state in 5~It is demonstrated that the 0 + state can be reproduced by a model space which also includes 2p-2h 50 " excitations. Strong neutron p-h components in the wave functions of states in 22T128 are found despite the closure of the neutron f7/2 orbit. Magnetic transitions in 5~ are discussed, and in contrast to the lp-lh results a sufficiently large quenching of B(M1) strengths in the 2p-2h model space is found. Effects of 2p-2h admixtures on M5transition strengths are discussed as well.

New determination of the magnetic moment of the54Fe(2 1 + ) state at 1.408 MeV

“…As emphasized by the same authors in a later work [21] in addition (2p-2h) configurations have to be included in such a calculation. Its quenching effect on the M1 strength has been demonstrated for nearby (fp) shell nuclei.…”