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

AutorGrodner, E.; Gadea, Andrés ; Sarriguren, Pedro ; Lenzi, Silvia M.; Poves, Alfredo ; Quintana, Begoña; Rinta-Antila, S.; Rubio, Berta ; Nara Singh, B. S.; Steer, A. N.; Verma, S.; Wadsworth, R.; Wieland, O.; Wollersheim, H. J.
Fecha de publicación28-ago-2014
EditorAmerican Physical Society
CitaciónPhysical Review Letters 113: 092501 (2014)
ResumenSearch 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. © 2014 American Physical Society.
DescripciónE. Grodner et al. ; 5 pags. ; 4 figs. ; 1 tab. ; PACS numbers: 21.60.Cs, 23.20.Lv, 23.40.−s
Identificadoresdoi: 10.1103/PhysRevLett.113.092501
issn: 1079-7114
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