Abstract
A systematic investigation of the structural evolution of the even-even isotones of 40<Z<50 nuclei in 50<N<60 range of neutron numbers has been done from the calculations of total Routhian surfaces (TRS) in the macroscopic-microscopic formalism. The calculations predict that the nuclei with N=56 are transitional ones with an onset of deformation at N≥56. It has been found that the shape of the midshell Ru (Z=44) isotopes is mostly γ-soft near the ground state. The TRS calculations at higher rotational frequencies (ħω) for 100,102Ru show a shape evolution in these nuclei from a prolate-like γ-soft to a stable triaxial shape. Such stable triaxial shapes in the even-even cores are important to explain the observed chiral bands in the odd-odd Rh nuclei. A common general feature that has been found for the heavier nuclei from this work is the shape invariance of the nuclei with same numbers of total (proton + neutron) valence particles away from N,Z=50.
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