Nuclear Structure Studies of Some Neutron Rich Nuclei Produced in 252Cf Spontaneous Fission

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Ramayya, A.V.^1 ; Hamilton, J.H.^1 ; Hwang, J.K.^1

Department of Physics and Astronomy, Vanderbilt University, Nashville

TN

37235, United States^1

关键词: Angular correlations;    Collective band;    Gamma transition;    Gammasphere detector arrays;    Level structure;    Neutron-rich nuclei;    Nuclear structure;    Spontaneous fission;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012017/pdf
DOI  :  10.1088/1742-6596/580/1/012017

来源: IOP

【 摘 要 】

High spin states of neutron-rich nuclei such as133,134Te,93Sr,105Nb have been studied by measuring γ- γ- γ coincidences (cube), γ- γ- γ- γ coincidences (hypercube) and angular correlations from the spontaneous fission of252Cf with the LBNL Gammasphere detector array. Four types of particle-hole bands built on the known 334.3 keV isomer in133Te were identified. The level structure of93Sr is interpreted, in part, as arising from the weak coupling of the 1d5/2 neutron hole to the yrast states of the94Sr core. The g-factor of the 4+state in134Te was measured, for the first time, by using a new technique developed for measuring angular correlations with Gammasphere. A new level scheme of105Nb was established. Three new collective bands were identified with a total of 14 new levels and 36 new γ transitions. In117-122Cd, a shift to more slightly deformed structures was found where the excited levels do not fit the long held picture of one, two and three phonon bands.