Abstract

The potential energy surfaces of the isotopes of Kr, Rb, Sr and Zr and the isotones N=40 in the A∼80 region of the nuclear landscape display interesting shape variations with N and Z. The shape evolution and the possible shape coexistence are discussed within the cranked Nilsson-Strutinsky (CNS) framework for the isotopic and isotonic chains. The results indicate an oblate shell gap at Z=36 and 37 and a prolate shell gap at Z=38 and 40 with deformation ϵ2∼0.4. Our calculations show a well deformed prolate shell gap at N=40 so that it is determinant in the nuclear shape in this mass region.

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