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Enhanced gamma-Ray Emission from Neutron Unbound States Populated in beta Decay

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Enhanced gamma-Ray Emission from Neutron Unbound States Populated in beta Decay

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dc.contributor.author	Taín Enríquez, José Luis
dc.contributor.author	Valencia, Ebhelixes
dc.contributor.author	Algora, Alejandro
dc.contributor.author	Agramunt Ros, Jorge
dc.contributor.author	Rubio Barroso, Berta
dc.contributor.author	Estévez Aguado, María Esther
dc.contributor.author	Jordán Martín, María Dolores
dc.date.accessioned	2016-05-04T11:34:24Z
dc.date.available	2016-05-04T11:34:24Z
dc.date.issued	2015
dc.identifier.citation	Taín Enríquez, José Luis Valencia, Ebhelixes Algora, Alejandro Agramunt Ros, Jorge Rubio Barroso, Berta Estévez Aguado, María Esther Jordán Martín, María Dolores 2015 Enhanced gamma-Ray Emission from Neutron Unbound States Populated in beta Decay Physical Review Letters 115 6 062502
dc.identifier.uri	http://hdl.handle.net/10550/53372
dc.description.abstract	Total absorption spectroscopy is used to investigate the beta-decay intensity to states above the neutron separation energy followed by gamma-ray emission in Br-87,Br-88 and Rb-94. Accurate results are obtained thanks to a careful control of systematic errors. An unexpectedly large. intensity is observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The gamma branching as a function of excitation energy is compared to Hauser-Feshbach model calculations. For Br-87 and Br-88 the gamma branching reaches 57% and 20%, respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich Rb-94 the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled by introducing an enhancement of 1 order of magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proves to be correct, leads to a similar increase in the (n, gamma) cross section that would have an impact on r process abundance calculations
dc.language.iso	eng
dc.relation.ispartof	Physical Review Letters, 2015, vol. 115, num. 6, p. 062502
dc.subject	Física
dc.title	Enhanced gamma-Ray Emission from Neutron Unbound States Populated in beta Decay
dc.type	journal article	es_ES
dc.date.updated	2016-05-04T11:34:24Z
dc.identifier.doi	10.1103/PhysRevLett.115.062502
dc.identifier.idgrec	107815
dc.rights.accessRights	open access	es_ES