Hindered gamow-teller decay to the odd-odd N=Z Ga 62: Absence of proton-neutron T=0 condensate in A=62

E. Grodner, A. Gadea, P. Sarriguren, S. M. Lenzi, J. Grȩbosz, J. J. Valiente-Dobón, A. Algora, M. Górska, P. H. Regan, D. Rudolph, G. De Angelis, J. Agramunt, N. Alkhomashi, L. Amon Susam, D. Bazzacco, J. Benlliure, G. Benzoni, P. Boutachkov, A. Bracco, L. CaceresR. B. Cakirli, F. C.L. Crespi, C. Domingo-Pardo, M. Doncel, Zs Dombrádi, P. Doornenbal, E. Farnea, E. Ganioǧlu, W. Gelletly, J. Gerl, A. Gottardo, T. Hüyük, N. Kurz, S. Leoni, D. Mengoni, F. Molina, A. I. Morales, R. Orlandi, Y. Oktem, R. D. Page, D. Perez, S. Pietri, Zs Podolyák, A. Poves, B. Quintana, S. Rinta-Antila, B. Rubio, B. S. Nara Singh, A. N. Steer, S. Verma, R. Wadsworth, O. Wieland, H. J. Wollersheim

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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 für Shwerionenforshung 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.

Original languageEnglish
Article number092501
JournalPhysical review letters
Volume113
Issue number9
DOIs
Publication statusPublished - Aug 28 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Grodner, E., Gadea, A., Sarriguren, P., Lenzi, S. M., Grȩbosz, J., Valiente-Dobón, J. J., Algora, A., Górska, M., Regan, P. H., Rudolph, D., De Angelis, G., Agramunt, J., Alkhomashi, N., Amon Susam, L., Bazzacco, D., Benlliure, J., Benzoni, G., Boutachkov, P., Bracco, A., ... Wollersheim, H. J. (2014). Hindered gamow-teller decay to the odd-odd N=Z Ga 62: Absence of proton-neutron T=0 condensate in A=62. Physical review letters, 113(9), [092501]. https://doi.org/10.1103/PhysRevLett.113.092501