High-Spin States and Level Structure in Stable Nucleus 84Sr

TL;DR

This study investigates high-spin states in the stable nucleus 84Sr, establishing a new level scheme with 12 new states and nearly 30 gamma-transitions, and compares experimental results with theoretical models.

Contribution

The paper presents the first detailed level scheme of 84Sr at high spins, including new states and gamma-transitions, and compares experimental data with shell model calculations.

Findings

12 new states identified in 84Sr

Nearly 30 new gamma-transitions observed

High-spin negative-parity band extended to I=19

Abstract

High-spin states of 84Sr were populated through the reaction 70Zn(18O, 4n)84Sr at 75 MeV beam energy. Measurement of excitation function, gamma-gamma coincidences, directional correlation of oriented states (DCO) ratios and gamma-transition intensities were performed using eight anticompton HPGe detectors and one planar HPGe detector. Based on the measured results, a new level scheme of 84Sr was established in which 12 new states and nearly 30 new gamma-transitions were identified in the present work. The positive-parity states of the new level scheme were compared with results from calculations in the framework of the projected shell model (PSM). One negative-parity band was extended to spin I=19 and it can be found that in the high-spin states the gamma-transition energies show the nature of signature staggering. The negative-parity band levels are in good agreement with the deformed configuration-mixing shell model (DCM) calculations.