| Thème(s) : |
 |
Physique/Physique Nucléaire Expérimentale
|
|
| Titre : |
|
Superallowed Gamow-Teller decay of the doubly magic nucleus 100Sn |
|
| Auteur : |
|
C.B. Hinke, M. Böhmer, P. Boutachkov, T. Faestermann, H. Geissel, J. Gerl, R. Gernhauser, M. Gorska, A. Gottardo, H. Grawe, J. L. Grebosz, R. Krûcken, N. Kurz, Z. Liu, L. Maier, F. Nowacki1, S. Piétri, Zs. Podolyak, K. Sieja1, K. Steiger, K. Straub, H. Weick, P. J.Woods, N. Al-Dahan, N. Alkhomashi, A. Ataç, A. Blazhev, N. F. Braun, I. T.Cˇelikovic, T. Davinson, I. Dillmann, C. Domingo-Pardo, P. C. Doornenbal, G. De France2, G. F. Farrelly, F. Farinon, N. Goel, T.C. Habermann, R. Hoischen, R. Janik, M. Karny, A. Kaskas, I.M. Kojouharov, Th. Kroll, Y. Litvinov, S. Myalski, F. Nebel, S. Nishimura, C. Nociforo, J. Nyberg, A. R. Parikh, A. Prochazka, P. H. Regan, C. Rigollet, H. Schaffner, C. Scheidenberger, S. Schwertel, P.-A. Soderstrom, S.J. Steer, A. Stolz, P. Strmen |
|
| Laboratoire : |
|
|
|
| Résumé : |
|
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 b1-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 b-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 b-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. |
|
|
| Type de publication : |
|
Articles dans des revues avec comité de lecture |
|
Date de publication
ou d'écriture : |
|
2012 |
|
| Nom du périodique : |
|
|
|
| Volume : |
|
486 |
|
| Page/Article : |
|
341-345 |
|
|
| Identifiant local : |
|
GANIL 2012-074 A |
|
| Commentaire : |
|
Expérience au GSI |
|
Récupérer au format
