Shape evolution of the Mo isotopes far from the valley of stability

by Jeongsu Ha (Universita e INFN, Padova (IT))

Tuesday 8 Feb 2022, 16:15 → 17:15 Europe/Zurich

CERN

The structure of molybdenum (Z=42) isotopes attracts attention since the theoretical results represented by the ground-state shape are sensitive to the way of calculation. Thus, a detailed study of the Mo isotopes provides valuable results to feedback the nuclear theories. In this talk, I will introduce the two experiments studying the neutron-rich and proton-rich sides of the Mo isotopes. 

First, the low-lying states of neutron-rich isotopes 106,108,110Mo have been investigated using the EURICA HPGe array and the LaBr3 array. Based on the first 2+ state lifetime measurement and the identification of the new states in the second 2+ band, the shape evolution with a triaxial degree of freedom is discussed. The results are compared with the beyond mean-field calculations. 

On the opposite, the proton-rich side has a different story. N=Z nuclei have been the subject for a long time due to their drastic shape changes among them. In particular, 84Mo was revealed that it is a transitional nuclide that prolate-oblate shape coexistence emerges according to the shell model calculations. To measure the B(E2), a key indicator for the structural change, we performed the lifetime measurement with the TRIPLEX plunger setup coupled to the GRETINA. I will present the preliminary results for the new measurement.