High-spin level scheme and decay of the 67-μs isomer in Pm142

An in-beam gamma-ray spectroscopy experiment for Pm-142 has been performed via the Te-128(F-19,5n) reaction at beam energies of 75 MeV through 95 MeV. Excitation functions and gamma-gamma coincidences have been measured. Detailed analysis of gamma-gamma coincidence relationships leads to a revised high-spin level scheme for Pm-142. The pih(11/2) x nuh(11/2)(-1) multiplet in this nucleus has been identified and the discussion is based on a systematic of corresponding states in neighboring odd-odd nuclei. The previously known 67-mus isomer and associated decay gamma rays have been placed into the new level scheme. This long-lived isomer is proposed to be a four-hole state with predominantly the (pig(7/2)(-1)d(5/2)(-2) x nuh(11/2)(-1))(13-) configuration.