Hindered Gamow-Teller decay to the odd-odd N=Z (62)Ga: absence of proton-neutron T=0 condensate in A=62

E. Grodner, A. Gadea, P. Sarriguren, S.M. Lenzi, J. Grebosz, 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. Ganioğlu, 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, J(π)=0+ ground state of (62)Ge into excited states of the odd-odd N=Z nucleus (62)Ga. The experiment is performed at GSI Helmholtzzentrum für Shwerionenforshung with the (62)Ge 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 (62)Ge ground state. Six excited states of (62)Ga, 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 (62)Ga.

Original languageEnglish
Article number092501
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number9
DOIs
Publication statusPublished - 28 Aug 2014
Externally publishedYes

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Grodner, E., Gadea, A., Sarriguren, P., Lenzi, S. M., Grebosz, J., Valiente-Dobón, J. J., ... Wollersheim, H. J. (2014). Hindered Gamow-Teller decay to the odd-odd N=Z (62)Ga: absence of proton-neutron T=0 condensate in A=62. Physical Review Letters, 113(9), [092501]. https://doi.org/10.1103/PhysRevLett.113.092501