1. Hindered Gamow-Teller Decay to the Odd-OddN=ZGa62: Absence of Proton-NeutronT=0Condensate inA=62
- Author
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J. J. Valiente-Dobón, Pedro Sarriguren, Robert Page, D. Bazzacco, B. Rubio, Dirk Rudolph, A. N. Steer, N. Kurz, S. M. Lenzi, S. Verma, P. Doornenbal, M. Górska, L. Caceres, Sami Rinta-Antila, G. de Angelis, N. Alkhomashi, L. Amon Susam, Maria Doncel, O. Wieland, Zs. Dombrádi, R. Wadsworth, E. Ganioǧlu, J. Agramunt, R. Orlandi, F. Molina, W. Gelletly, H. J. Wollersheim, J. Grȩbosz, E. Farnea, J. Benlliure, P. Boutachkov, Alejandro Algora, R. B. Cakirli, Zs. Podolyák, B. S. Nara Singh, A. I. Morales, A. Gottardo, Begoña Quintana, S. Pietri, P. H. Regan, A. Gadea, D. Mengoni, T. Hüyük, Alfredo Poves, E. Grodner, Dolores Pérez, C. Domingo-Pardo, F. C. L. Crespi, A. Bracco, G. Benzoni, Y. Oktem, J. Gerl, and S. Leoni
- Subjects
Physics ,Proton ,Double beta decay ,Excited state ,Nuclear Theory ,Quasiparticle ,General Physics and Astronomy ,Neutron ,Atomic physics ,Nuclear Experiment ,Random phase approximation ,Ground state ,Spin (physics) - Abstract
Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay of the T=1, Jπ=0+ ground state of Ge62 into excited states of the odd-odd N=Z nucleus Ga62. The experiment is performed at GSI Helmholtzzentrum fur Schwerionenforschung with the Ge62 ions selected by the fragment separator and implanted in a stack of Si-strip detectors, surrounded by the RISING Ge array. A half-life of T1/2=82.9(14) ms is measured for the Ge62 ground state. Six excited states of Ga62, populated below 2.5 MeV through Gamow-Teller transitions, are identified. Individual Gamow-Teller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable low-lying Gamow-Teller strength in the reported beta-decay experiment supports the hypothesis of a negligible role of coherent T=0 proton-neutron correlations in Ga62. (Less)
- Published
- 2014
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