Detailed α -decay study of Tl180

B Andel,S Vermote,U Köster,T E Cocolios,J A Heredia,N Bree,V N Fedosseev,J Elseviers,S Franchoo,D V Fedorov,P Van Duppen,M D Seliverstov,J Van De Walle,R D Page,A N Andreyev,P Van Den Bergh,V F Comas,L Ghys,S Antalic,N Patronis,C Wagemans,J Diriken,K Nishio,M Venhart,M Veselský,I Tsekhanovich,B A Marsh,О Иванов ,A E Barzakh ,Liberati ,M Huýse

doi:10.1103/physrevc.96.054327

Abstract

A detailed $\alpha$-decay spectroscopy study of $^{180}\mathrm{Tl}$ has been performed at ISOLDE (CERN). $Z$-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of $^{180}\mathrm{Tl}$. Fine-structure $\alpha$ decays to excited levels in the daughter $^{176}\mathrm{Au}$ were identified and an $\alpha$-decay scheme of $^{180}\mathrm{Tl}$ was constructed based on an analysis of $\alpha$-$\gamma$ and $\alpha$-$\gamma$-$\gamma$ coincidences. Multipolarities of several $\gamma$-ray transitions deexciting levels in $^{176}\mathrm{Au}$ were determined. Based on the analysis of reduced $\alpha$-decay widths, it was found that all $\alpha$ decays are hindered, which signifies a change of configuration between the parent and all daughter states.

Highlights

Odd-odd nuclei in the Z = 82 region are well known for a complex pattern of closely spaced multiplet states at low excitation energy arising from coupling of the odd proton with the odd neutron
Fine-structure α decays to excited levels in the daughter 176Au were identified and an α-decay scheme of 180Tl was constructed based on an analysis of α-γ and α-γ -γ coincidences
As α decay is very sensitive to changes of spin, parity, or configuration between initial and final states, α-decay spectroscopy is a valuable technique for investigating complicated level schemes [5]

Summary

Introduction

Odd-odd nuclei in the Z = 82 region are well known for a complex pattern of closely spaced multiplet states at low excitation energy arising from coupling of the odd proton with the odd neutron (see, e.g., [1,2,3] and references therein). The relative position of the states within the multiplet may depend on the neutron number; see the discussion in [4]. The method is especially effective for identification of low-lying excited levels in daughter nuclei when α-γ coincidences are measured.

Results

Discussion

Conclusion