High energy levels of 144Nd excited in the decay of 144Pm

Abstract

Gamma–gamma coincidence measurements, carried out with a 7.6 cm × 7.6 cm NaI(Tl) crystal and a 30 cm3 Ge–Li detector, have been performed to look for excited states in 144Nd higher than the known level at 1789 keV. These measurements definitely establish the existence of a level at 2093.11 keV and suggest the placing of another level at 2204.74 keV. Furthermore, an E3 transition deexciting the 1510.14-keV level seems to be present.