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The N = Z nucleus 76 Sr: Gamow-Teller strength and nuclear deformation

Authors:	Ph Dessagne M J G Borge J Giovinazzo A Huck A Jokinen A Knipper C Longour G Marguier M Ramdhane V Rauch O Tengblad G Walter Ch Miehé

Institution:	(1) 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

Abstract:	Challenged by recent theoretical work, a study of the $\beta^ +$ -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 $J^{\pi} = 1^{ + }$ 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 $\beta$ p branching ratio has been determined to be $(3.4 \pm 0.8)\cdot 10^{-5}$ . The ⁷⁶ Sr half-life has been remeasured and a more precise value of $7.89 \pm 0.07$ 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.Received: 26 June 2003, Revised: 5 November 2003, Published online: 18 June 2004PACS: 21.10.Hw Spin, parity, and isobaric spin - 23.20.Lv $\gamma$ transitions and level energies - 23.40.Hc Relation with nuclear matrix elements and nuclear structure - 27.50. + e $59 \leq A \leq 89$ J. Giovinazzo: Present address: Centre d Etudes Nucléaires de Bordeaux-Gradignan, Le Haut Vigneau, F-33175 Gradignan Cedex, France.M. Ramdhane: Present address: University Mentouri, 25000 Constantine, Algeria.

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