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.
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Communicated by J. Äystö
Received: 26 June 2003, Revised: 5 November 2003, Published online: 18 June 2004
PACS:
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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Dessagne, P., Borge, M.J.G., Giovinazzo, J. et al. The N = Z nucleus 76 Sr: Gamow-Teller strength and nuclear deformation. Eur. Phys. J. A 20, 405–411 (2004). https://doi.org/10.1140/epja/i2003-10171-6
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DOI: https://doi.org/10.1140/epja/i2003-10171-6