Assignment of spin and parity to states in the nucleus ¹⠹⠶T1

Abstract

This work presents a study of high-spin states in the nucleus ¹⠹⠶Tl via γ-spectroscopy. ¹⠹⠶Tl was produced via the ¹⠹⠷Au(⠴He,5n) ¹⠹⠶Tl reaction at a beam energy of 63 MeV. The γ-γ coincidence measurements were performed using the AFRODITE γ-spectrometer array at iThemba LABS. The previous level scheme of ¹⠹⠶Tl has been extended up to an excitation of 4071 keV including 24 new γ-ray transitions. The spin and parity assignment to levels was made from the directional correlation of oriented nuclei (DCO) and linear polarization anisotropy ratios. An analysis of the B(M1)/B(E2) ratios was found to be consistent with the configuration of πh₉/₂♠vi₠₃/₂ for the ground state band. Although no chiral band was found in ¹⠹⠶TI and ¹⠹⠸TI.