Shape coexistence in 180Hg studied through the β decay of 180Tl

J. Elseviers , A. N. Andreyev (1) , S. Antalic , A. Barzakh , N. Bree , T. E. Cocolios (1) , V. F. Comas , J. Diriken , D. Fedorov , V. N. Fedosseyev , S. Franchoo (2) , J. A. Heredia , M. Huyse (1) , O. Ivanov , U. K¨oster (3) , B. A. Marsh , R. D. Page , N. Patronis , M. Seliverstov , I. Tsekhanovich (4) , P. van den Bergh , J. van de Walle , P. van Duppen (1) , M. Venhart (1) , S. Vermote , M. Veselsk'y , C. Wagemans

1 IKS - Instituut voor Kern-en Stralingsfysica
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 ILL - Institut Laue-Langevin
4 ACEN - Aval du cycle et Energie Nucléaire

The β + /EC decay of 180Tl and excited states in the daughter nucleus 180Hg have been investigated at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. Many new low-lying energy levels were observed in 180Hg, of which the most significant are the 0+ 2 at 419.6 keV and the 2+ 2 at 601.3 keV. The former is the bandhead of an excited band in 180Hg assumed originally to be of prolate nature. From the β feeding to the different states in 180Hg, the ground-state spin of 180Tl was deduced to be (4−,5−).

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J. Elseviers, A. N. Andreyev, S. Antalic, A. Barzakh, N. Bree, et al.. Shape coexistence in 180Hg studied through the β decay of 180Tl. Physical Review, 2011, 84, pp.034307. ⟨10.1103/PhysRevC.84.034307⟩. ⟨in2p3-00655964⟩