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dc.contributor.authorKirsebom, O.S.-
dc.contributor.authorAlcorta, Martín-
dc.contributor.authorGarcía Borge, María José-
dc.contributor.authorCubero, M.-
dc.contributor.authorDiget, C.Aa.-
dc.contributor.authorFraile, Luis M.-
dc.contributor.authorFulton, Brian R.-
dc.contributor.authorFynbo, H.O.U.-
dc.contributor.authorGalaviz, D.-
dc.contributor.authorJonson, Björn-
dc.contributor.authorMadurga, Miguel-
dc.contributor.authorNilsson, Thomas-
dc.contributor.authorNyman, Göran-
dc.contributor.authorRiisager, Karsten-
dc.contributor.authorTengblad, Olof-
dc.contributor.authorTurrión, Manuela-
dc.identifierdoi: 10.1103/PhysRevLett.108.202501-
dc.identifierissn: 0031-9007-
dc.identifier.citationPhysical Review Letters 108 (2012)-
dc.description.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.-
dc.description.sponsorshipSupport of the Spanish CICYT Research Grants No. FPA2009-07387 and No. FPA2010-17142 and the MICINN Consolider Project No. CSD 2007-00042 as well as the support of the European Union VI Framework through RII3-EURONS/JRA4-DLEP(Contract No. 506065). O. S. K. acknowledges support from the Villum Kann Rasmussen Foundation.-
dc.publisherAmerican Physical Society-
dc.titleImproved limit on direct α decay of the Hoyle state-
dc.description.versionPeer Reviewed-
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