The N = Z nucleus 76 Sr: Gamow-Teller strength and nuclear deformation
Institut de Recherches Subatomiques, UMR 7500 CNRS-IN2P3 et Université Louis Pasteur, 23 rue du Loess, B.P. 28,, F-67037, Strasbourg Cedex 2,, France
2 Instituto de Estructura de la Materia,, CSIC, Serrano 113bis, E-28006, Madrid,, Spain
3 Division EP, CERN,, ISOLDE, CH-1211, Geneva, Switzerland
4 Institut de Physique Nucléaire,, Université Claude Bernard-Lyon I, F-69622, Villeurbanne Cedex, France
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Challenged by recent theoretical work, a study of the -EC decay of the N = Z even-even nucleus 76 Sr has been undertaken in order to assign the parent ground-state deformation. In this study 13 levels with have been located in 76 Rb. The beta-delayed proton emission has been observed for the first time in an N = Z even-even nucleus. The p branching ratio has been determined to be . The 76 Sr half-life has been remeasured and a more precise value of s has been obtained. On the basis of the comparison of measured Gamow-Teller strength with calculated strength distributions for both oblate and prolate deformation, it is concluded that the 76 Sr has strong prolate deformation in the ground state.
© Società Italiana di Fisica and Springer-Verlag, 2004