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- Title
Superallowed Gamow-Teller decay of the doubly magic nucleus <sup>100</sup>Sn.
- Authors
Hinke, C. B.; Böhmer, M.; Boutachkov, P.; Faestermann, T.; Geissel, H.; Gerl, J.; Gernhäuser, R.; Górska, M.; Gottardo, A.; Grawe, H.; Gr?bosz, J. L.; Krücken, R.; Kurz, N.; Liu, Z.; Maier, L.; Nowacki, F.; Pietri, S.; Podolyák, Zs.; Sieja, K.; Steiger, K.
- Abstract
The shell structure of atomic nuclei is associated with 'magic numbers' and originates in the nearly independent motion of neutrons and protons in a mean potential generated by all nucleons. During ?+-decay, a proton transforms into a neutron in a previously not fully occupied orbital, emitting a positron-neutrino pair with either parallel or antiparallel spins, in a Gamow-Teller or Fermi transition, respectively. The transition probability, or strength, of a Gamow-Teller transition depends sensitively on the underlying shell structure and is usually distributed among many states in the neighbouring nucleus. Here we report measurements of the half-life and decay energy for the decay of 100Sn, the heaviest doubly magic nucleus with equal numbers of protons and neutrons. In the ?-decay of 100Sn, a large fraction of the strength is observable because of the large decay energy. We determine the largest Gamow-Teller strength so far measured in allowed nuclear ?-decay, establishing the 'superallowed' nature of this Gamow-Teller transition. The large strength and the low-energy states in the daughter nucleus, 100In, are well reproduced by modern, large-scale shell model calculations.
- Subjects
NUCLEAR physics; NEUTRONS; PROTONS; POSITRONS; CELL nuclei
- Publication
Nature, 2012, Vol 486, Issue 7403, p341
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature11116