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Average excited state lifetimes in /sup 73/Br

Lifetimes in the region of 10/sup -16/ s have been measured for excited states between 4 and 6.6 MeV in /sup 73/Br. The states were produced by the beta /sup +/(EC) decay of a mass-separated source of /sup 73/Kr, and they decayed by the emission of protons or gamma - rays; their lifetimes were measu...

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Detalles Bibliográficos
Autores principales: Asbo- Hansen, P, Hagberg, E, Hansen, P G, Hardy, J C, Jonson, B, Mattsson, S
Lenguaje:eng
Publicado: 1981
Materias:
Acceso en línea:http://cds.cern.ch/record/878285
Descripción
Sumario:Lifetimes in the region of 10/sup -16/ s have been measured for excited states between 4 and 6.6 MeV in /sup 73/Br. The states were produced by the beta /sup +/(EC) decay of a mass-separated source of /sup 73/Kr, and they decayed by the emission of protons or gamma - rays; their lifetimes were measured by the particle X-ray coincidence technique. The data yield information on both gamma -ray and proton partial widths as well as on the level density, a level density parameter a=13.7 MeV/sup -1/ is obtained. With the level widths so determined, a statistical model calculation yields excellent agreement with the delayed proton spectrum if a smooth gaussian beta -strength function is employed. It is concluded, however, that without the lifetime data, beta -strength function information could not have been reliably extracted. (23 refs).