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.
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. Caceres, R.B. Cakirli, F.C.L. Crespi, C. Domingo-Pardo, M. Doncel, Z. 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, Z. 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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:9(2014), pp. 092501.1-092501.5.
Hindered gamow-teller decay to the odd-odd N=Z Ga 62: Absence of proton-neutron T=0 condensate in A=62
A. Bracco;F.C.L. Crespi;S. Leoni;
2014
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.
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