Superallowed Gamow-Teller decay of the doubly magic nucleus 100Sn.

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Bibliographic Details
Title:	Superallowed Gamow-Teller decay of the doubly magic nucleus ¹⁰⁰Sn.
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.
Source:	Nature. 6/21/2012, Vol. 486 Issue 7403, p341-345. 5p.
Subjects:	Nuclear physics, Neutrons, Protons, Positrons, Cell nuclei
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. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
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. [ABSTRACT FROM AUTHOR]
ISSN:	00280836
DOI:	10.1038/nature11116