Abstract
High-spin states in204Pb were populated in the204Hg(α,4n) reaction using α-particles in the energy region 42–51 MeV. Prompt and delayedγ-rays as well as conversion electrons were studied in addition to excitation functions, angular distributions andγ-γ coincidences. In this way a stretched cascade ofγ-rays from a level at 8125.9 keV was found to feed the previously known isomeric 9− level at 2185.7 keV. Spins and parities were established for levels up to and including a 19− level at 6098.0 keV. The levels with c= 172212; and 19− at excitation energies of 5664.3 and 6098.0 keV are likely to be due to the simplep12/s-1i132/−3 andf52/−1i132/−3 configurations. The agreement between calculated and experimental energies for all observed levels in the regionJ=9–19 is very good in cases where the empirical two-particle interactions used are satisfactorily well known.
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