Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.182501
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Funding
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357, DE-FG02-94ER40834, DE-FG02-94ER40848, DE-FG02-97ER41041, DE-FG02-97ER41033]
- Academy of Finland under the Finnish Center of Excellence Programme [284612]
- STFC [ST/J003468/1, ST/P004008/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J003468/1] Funding Source: researchfish
- Academy of Finland (AKA) [284612, 284612] Funding Source: Academy of Finland (AKA)
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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.
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