Studies of proton states in 173Lu, 175Lu and 177Lu with (3He, d) and (α, t) reactions

Proton particle states in the odd lutetium isotopes 173Lu, 175Lu and 177Lu have been studied using the (3He, d) and (α, t) reactions. The beams of 28 MeV 3He and 30 MeV α-particles were provided by the University of Rochester model MP tandem Van de Graaff accelerator. The reaction products were analysed with an Enge-type broad-range magnetic spectrograph and detected with photographic emulsions. The experimental peak widths (FWHM) were 15–20 keV and the spectra were studied up to excitation energies of 2 MeV in each final nucleus. The present results confirm earlier assignments for the low-lying 72+[404], 52+[402], 12−[541] and 93+[514] bands. Higher spin rotational members have been observed for several of these previously known bands. A number of new intrinsic states have been found and interpreted in terms of the Nilsson model. These include the 92−[514] orbital in 173Lu and the 12−[541] orbital in 177Lu. The 12−[530] band, and probably the 32−[532] band have been identified at excitation energies above 1 MeV in all three isotopes. Relative spectroscopic factors were extracted with the aid of DWBA calculations. These spectroscopic factors showed evidence for appreciable Coriolis mixing in some cases, particularly between the 12−[541] and 32−[532] orbitals.