Collective Structure of Neutron-Rich Nuclei around 100Zr
Prof. Angela Di Fulvio
University of Illinois
The tensor force plays an important role in the configuration-dependent shell evolution named as type II shell evolution, which leads to the multiple shapes coexisting in one nucleus. The neutron-rich nuclei around Z=40 is well known for the shape coexistence phenomenon. With the Monte Carlo Shell Model (MCSM) calculation, three 0+ states are predicted in 100Zr to manifest different shapes from the ground 01+ state. Especially, the 04+ state in 100Zr is predicated as a spherical shape but has even not been experimentally observed until today. An experiment to search the 04+ state in 100Zr with β-decay spectroscopy of 100Y was performed at the Argonne Tandem-Linac Accelerator System (ATLAS) facility, with the high-precision gamma-ray spectrometer of GAMMASPHERE and a 100Y beam extracted from the Californium Rare Ion Breeder Upgrade (CARIBU). In this experiment, the 04+ and 05+ states in 100Zr were firstly identified with the gamma-gamma coincidence and gamma-gamma angular correlation, which provided two candidates for the predicted spherical 04+ state. In this talk, the shape coexistence of 100Zr will be mainly addressed in detail, followed by extending my research to the region of shape phase transition around 110Zr. In the end, I would like to present some ideas regarding my future research plan, which can be conducted at ATLAS and FRIB in the future.
All interested persons are invited to attend remotely—email firstname.lastname@example.org for information.