Abstract
Based on the microscopic sdIBM-2 approach and the single-particle energies from experiment, with the use of the most general Hamiltonian, the vibrational band and rotational band of 102Ru nucleus as well as its evolutional process are reproduced very well by two parameters of nucleon-nucleon effective interactions, respectively. Microscopic and phenomenological study identifies that: 1) the coexisting region of two excitation models are located in the interval between the state 8+1 and state 12+1 (which is an interval with Ex=2.50—4.00 MeV), the 8+1 state is a state predominant in the vibrational model, the 12+1 state is one predominant in the rotational model, while the state 10+1 is neutral relative to two models; 2) the 12+1 state is a medial state decoupled from the 14+1 state to the 10+1 state as well released photons; 3) the yrast states from the ground-state up to the 20+1 state are collective states, hereafter the first breaking up and aligning state may be a neutron two-particle-state in the intruder orbits h11/2; 4) this structure evolution is not very furious, but achieved softly by the boson structure constant changing unobviously in the coexisting region.
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