Abstract
High spin states in the nucleus have been studied via the fusion evaporation reaction Ar, 3p) , at 149 MeV and 140 MeV beam energy. The OSIRIS spectrometer, an additional high purity Ge detector at 162°, and several particle detectors were used to measure γγ- and particle-γγ coincidences, directional correlations of oriented states and line shapes due to Doppler-shift attenuation. Lifetimes in the – s range were measured by the recoil distance Doppler-shift method. Some 110 transitions were placed into a level scheme comprising 51 levels reaching up to 12.2 MeV excitation energy and a possible spin I=49/2ħ. A large number of spin-paritly assignments and E2/M1 mixing ratios and lifetimes were deduced. This extensive data set is used for a detailed test of shell model calculations. They were performed with different sets of parameters, within either a restricted π(), π(), ν(), and ν() configuration space or an enlarged configuration space including the π() and π() orbits.
- Received 24 August 1993
DOI:https://doi.org/10.1103/PhysRevC.49.66
©1994 American Physical Society