Asymmetric rotor model for positive parity states of 71As, 73As and 81Rb

Abstract

The positive parity states of 71As, 73As and 81Rb, which consist of a 4g 9 2 proton coupled to the rotational motion of the core are studied in terms of the asymmetric rotor model with variable moment of inertia. One obtains a reasonable agreement with experimental excitation energies if one allows the mixture of 4d 5 2 and 4g 9 2 states for the description of the odd particle. The results suggest that these nuclei have rather stable γ deformations ( γ ≈ 25°) as those in A ≈ 130 and A ≈ 190 mass regions.