Study of the high spin states in stable nucleus 84Sr

Abstract

30 new γ-transitions were identified. The positive-parity states of the energy-level scheme were calculated in the framework of the projected shell model. The calculation results roughly agree with the experimental data. Owing to the use of the simple Bardeen-Cooper-Schrieffer vacuum, which only has the properties of the ground-state rotational band and not those of collective vibrations, the calculated levels are higher than the experimental values. The negative-parity states were extended to an energy of 10487 keV (I π =19 – ). The states exhibited a very good collective vibration-like nature when the spins and parities of states are above 11 – . In addition, we found that above the 14 – state, the γ-transition energies show signature staggering. The negative-parity band levels are in good agreement with deformed configuration-mixing shell model calculations. One journal reviewer said: “This is a systematic work in which new levels and γ-transitions were obtained through a nuclear structure experiment. The positive-parity bands were calculated using the projected shell model and compared with experimental data. The properties of 84 Sr were discussed. This paper is valuable to nuclear structure research.”