We report the first observation of the Xe-108 -> Te-104 -> Sn-100 alpha-decay chain. The alpha emitters, Xe-108 [E-alpha = 4.4(2) MeV, T-1/2 = 58(-23)(+106) mu s] and Te-104[E-alpha = 4.9(2) MeV, T-1/2 < 18 ns], decaying into doubly magic(100)Sn were produced using a fusion-evaporation reaction Fe-54(Ni-58, 4n)Xe-108, and identified with a recoil mass separator and an implantation-decay correlation technique. This is the first time alpha 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 Po-212 into doubly magic Pb-208. Enhanced proton-neutron interactions in the N = Z parent nuclei may result in superallowed a decays with reduced a-decay widths significantly greater than that for Po-212. From the decay chain, we deduce that the a-reduced width for Xe-108 or Te-104 is more than a factor of 5 larger than that for Po-212.
Superallowed alpha Decay to Doubly Magic Sn-100 / 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. Scholey, R. Talwar, W.B. Walters, P.J. Woods, S. Zhu. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:18(2018), pp. 182501.1-182501.6. [10.1103/PhysRevLett.121.182501]
Superallowed alpha Decay to Doubly Magic Sn-100
S. Bottoni;
2018
Abstract
We report the first observation of the Xe-108 -> Te-104 -> Sn-100 alpha-decay chain. The alpha emitters, Xe-108 [E-alpha = 4.4(2) MeV, T-1/2 = 58(-23)(+106) mu s] and Te-104[E-alpha = 4.9(2) MeV, T-1/2 < 18 ns], decaying into doubly magic(100)Sn were produced using a fusion-evaporation reaction Fe-54(Ni-58, 4n)Xe-108, and identified with a recoil mass separator and an implantation-decay correlation technique. This is the first time alpha 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 Po-212 into doubly magic Pb-208. Enhanced proton-neutron interactions in the N = Z parent nuclei may result in superallowed a decays with reduced a-decay widths significantly greater than that for Po-212. From the decay chain, we deduce that the a-reduced width for Xe-108 or Te-104 is more than a factor of 5 larger than that for Po-212.File | Dimensione | Formato | |
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