β-delayed fission of 180Tl

J. Elseviers , A. N. Andreyev , M. Huyse , P. van Duppen , S. Antalic , A. Barzakh , N. Bree , T. E. Cocolios , V. F. Comas , J. Diriken , D. Fedorov , V. N. Fedosseev , S. Franchoo (1) , L. Ghys , J. A. Heredia , O. Ivanov , U. K¨oster (2) , B. A. Marsh , K. Nishio , R. D. Page , N. Patronis , M. D. Seliverstov (3) , I. Tsekhanovich (4) , P. van den Bergh , J. van de Walle (5) , M. Venhart , S. Vermote , M. Veselsk'y , C. Wagemans

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

The detailed analysis of the β-delayed fission data of 180Tl is presented. The experiment was performed by producing a pure beam of 180Tl by means of highly selective resonance laser ionization followed by mass separation with the ISOLDE (CERN, Geneva) isotope separator. A surprising asymmetric mass distribution of fission fragments from 180Hg, the daughter of 180Tl β decays, was observed. Here, the energy calibration of the silicon detectors, which is crucial for a proper determination of the fission fragments' energy and mass split, is presented and the total kinetic energy and its dependence on the mass split ratio is discussed. A more precise β-delayed fission probability PβDF(180Tl) = 3.2(2) × 10−3% was deduced.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

J. Elseviers, A. N. Andreyev, M. Huyse, P. van Duppen, S. Antalic, et al.. β-delayed fission of 180Tl. Physical Review C, 2013, 88, pp.044321. ⟨10.1103/PhysRevC.88.044321⟩. ⟨in2p3-00918280⟩