| Title |
Hindered Gamow-Teller Decay to the Odd-Odd N=Z Ga62: Absence of Proton-Neutron T=0 Condensate in A=62
|
|---|---|
| Published in |
Physical Review Letters, August 2014
|
| DOI | 10.1103/physrevlett.113.092501 |
| Pubmed ID | |
| Authors |
E. Grodner, A. Gadea, P. Sarriguren, S. M. Lenzi, J. Gre¸bosz, 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. Caceres, R. 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 |
| 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. |
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