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

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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]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Superallowed Gamow-Teller decay of the doubly magic nucleus <superscript>100</superscript>Sn.
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  Data: <searchLink fieldCode="AR" term="%22Hinke%2C+C%2E+B%2E%22">Hinke, C. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Böhmer%2C+M%2E%22">Böhmer, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Boutachkov%2C+P%2E%22">Boutachkov, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Faestermann%2C+T%2E%22">Faestermann, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Geissel%2C+H%2E%22">Geissel, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Gerl%2C+J%2E%22">Gerl, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Gernhäuser%2C+R%2E%22">Gernhäuser, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Górska%2C+M%2E%22">Górska, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Gottardo%2C+A%2E%22">Gottardo, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Grawe%2C+H%2E%22">Grawe, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Gr%3Fbosz%2C+J%2E+L%2E%22">Gr?bosz, J. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Krücken%2C+R%2E%22">Krücken, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Kurz%2C+N%2E%22">Kurz, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Liu%2C+Z%2E%22">Liu, Z.</searchLink><br /><searchLink fieldCode="AR" term="%22Maier%2C+L%2E%22">Maier, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Nowacki%2C+F%2E%22">Nowacki, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Pietri%2C+S%2E%22">Pietri, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Podolyák%2C+Zs%2E%22">Podolyák, Zs.</searchLink><br /><searchLink fieldCode="AR" term="%22Sieja%2C+K%2E%22">Sieja, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Steiger%2C+K%2E%22">Steiger, K.</searchLink>
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  Data: 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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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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