Speaker
Description
The focus of this work is neutron-rich Fe and Mn isotopes with N~40, which lie within an Island of Inversion approximately centered at 64Cr. Here, a quenching of the N=40 sub-shell gap allows multi-particle, multi-hole excitations and deformation to develop in the ground-state configurations of nuclei in the region. Limited spectroscopic information has been collected so far in the region of N~40 below 68Ni. For the even-even nuclei, the 2+1 and 4+1 state energy systematics has been explored and, for the Fe and Cr isotopes, of B(E2; 2+1->0+1) values have been measured up to 68Fe and 64Cr. Large-scale shell model (LSSM) calculations well reproduce the energy systematics of the observed low-lying states of the even-even Fe and Cr isotopes around N=40. However, spectroscopic factor and more complete level scheme predictions in the region have not yet been benchmarked by experimental results.
Proton knockout reactions on the neutron-rich N=38 and N=40 isotopes 64,66Fe and 63,65Mn have been performed to investigate the proton spectroscopic factors of the parent nuclei. We will discuss the results of this measurement as well as a complementary secondary fragmentation measurement, and interpret in comparison with both LSSM and Nilsson model calculations.
