Nature of yrast excitations near N=40: Level structure of Ni-67

作者：Zhu S^*; Janssens R V F; Carpenter M P; Chiara C J; Broda R; Fornal B; Hoteling N; Krolas W; Lauritsen T; Pawlat T; Seweryniak D; Stefanescu I; Stone J R; Walters W B; Wang X; Wrzesinski J

来源：Physical Review C, 2012, 85(3): 034336.

DOI：10.1103/PhysRevC.85.034336

Excited states in Ni-67 were populated in deep-inelastic reactions of a Ni-64 beam at 430 MeV on a thick U-238 target. A level scheme built on the previously known 13-mu s isomer has been delineated up to an excitation energy of 5.3 MeV and a tentative spin and parity of (21/2(-)). Shell model calculations have been carried out using two effective interactions in the f(5/2)pg(9/2) model space with a Ni-56 core. Satisfactory agreement between experiment and theory is achieved for the measured transition energies and branching ratios. The calculations indicate that the yrast states are associated with rather complex configurations, herewith demonstrating the relative weakness of the N = 40 subshell gap and the importance of multi-particle-hole excitations involving the g(9/2) neutron orbital.

• 出版日期2012-3-30