Average excited state lifetimes in 73Br
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Lifetimes in the region of 10-16 s have been measured for excited states between 4 and 6.6 MeV in 73Br. The states were produced by the +(EC) decay of a mass-separated source of 73Kr, and they decayed by the emission of protons or -rays; their lifetimes were measured by the particle X-ray coincidence technique. The data yield information on both -ray and proton partial widths as well as on the level density, a level density parameter-a = 13.7 MeV-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 -strength function is employed. It is concluded, however, that without the lifetime data, -strength function information could not have been reliably extracted. 1981.