Abstract
The properties of high-spin states in /sup 205/At have been studied with the /sup 197/Au(/sup 12/C,4n)/sup 205/At reactions. In-beam measurements (with Ge(Li) detectors) of ..gamma..-..gamma.. coincidences, ..gamma..-ray angular distributions, and pulsed-beam ..gamma.. timing were made to determine the decay scheme, level energies, ..gamma..-ray multipolarities, spin-parity assignments, and isomeric life-times. High spin states up to 29/2 h were identified as either proton excitations of the (N = 126) /sup 211/At nucleus coupled to the /sup 202/Pb(Z = 82) ground state or neutron excitations of /sup 202/Pb coupled to the (..pi..h/sub 9/2/)/sup 3/9/2/sup -/ ground state of /sup 211/At. The lifetime measurements of the 25/2/sup +/ 2062-keV state and the unobserved isomeric state (29/2/sup +/) above 2339 keV yielded mean lifetimes of 92(3) nsec and approx.3 ..mu..sec, respectively.
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