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Improved limit on direct α decay of the Hoyle state

AuthorsKirsebom, O.S.; Alcorta, Martín ; García Borge, María José ; Cubero, M. ; Diget, C.Aa.; Fraile, Luis M. ; Fulton, Brian R.; Fynbo, H.O.U.; Galaviz, D. ; Jonson, Björn; Madurga, Miguel ; Nilsson, Thomas; Nyman, Göran; Riisager, Karsten; Tengblad, Olof ; Turrión, Manuela
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review Letters 108 (2012)
AbstractThe current evaluation of the triple-α reaction rate assumes that the α decay of the 7.65 MeV, 0 + state in C12, commonly known as the Hoyle state, proceeds sequentially via the ground state of Be8. This assumption is challenged by the recent identification of two direct α-decay branches with a combined branching ratio of 17(5)%. If correct, this would imply a corresponding reduction in the triple-α reaction rate with important astrophysical consequences. We have used the B11(He3,d) reaction to populate the Hoyle state and measured the decay to three α particles in complete kinematics. We find no evidence for direct α-decay branches, and hence our data do not support a revision of the triple-α reaction rate. We obtain an upper limit of 5×10 -3 on the direct α decay of the Hoyle state at 95% C.L., which is 1 order of magnitude better than a previous upper limit. © 2012 American Physical Society.
Identifiersdoi: 10.1103/PhysRevLett.108.202501
issn: 0031-9007
Appears in Collections:(CFMAC-IEM) Artículos
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