Superallowed α Decay to Doubly Magic 100Sn

K Auranen, D. Seweryniak, M Albers, A. D. Ayangeakaa, S Bottoni, M P Carpenter, C. J. Chiara, P Copp, H. M. David, D. T. Doherty, J Harker, C.R. Hoffman, R V F Janssens, T. L. Khoo, S A Kuvin, T. Lauritsen, G Lotay, A. M. Rogers, J Sethi, C. ScholeyR Talwar, W. B. Walters, P. J. Woods, S. Zhu

Research output: Contribution to journalArticlepeer-review


We report the first observation of the 108Xe→104Te→100Sn α-decay chain. The α emitters, 108Xe [Eα=4.4(2)  MeV, T1/2=58+106−23  μs] and 104Te [Eα=4.9(2)  MeV, T1/2<18  ns], decaying into doubly magic 100Sn were produced using a fusion-evaporation reaction 54Fe(58Ni,4n)108Xe, and identified with a recoil mass separator and an implantation-decay correlation technique. This is the first time α radioactivity has been observed to a heavy self-conjugate nucleus. A previous benchmark for study of this fundamental decay mode has been the decay of 212Po into doubly magic 208Pb. Enhanced proton-neutron interactions in the N=Z parent nuclei may result in superallowed α decays with reduced α-decay widths significantly greater than that for 212Po. From the decay chain, we deduce that the α-reduced width for 108Xe or 104Te is more than a factor of 5 larger than that for 212Po.
© 2018 American Physical Society
Original languageEnglish
Article number182501
Number of pages6
JournalPhysical Review Letters
Issue number18
Early online date30 Oct 2018
Publication statusPublished - 2 Nov 2018


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