A Study of Lutetium Isotopes Using Single Particle Transfer Reactions

Abstract

<p>The nuclear energy level structure of the three odd-Z nuclei 173Lu, 175Lu and 177Lu have been investigated using the (3He,d) and (α,t) reactions. The resulting spectra have been interpreted using the Nilsson model with corrections for Coriolis coupling and pairing effects. The present work confirms the earlier assignments of the 7/2+[404] and 5/2+[402] proton orbitals in all three nuclei. New assignments are made for the 9/2-[514] orbital in 173Lu and the 1/2-[541] orbital in 177Lu. The assignment of these states is confirmed in the remaining nuclei in each case. The assignment of the 1/2+[411] orbital is confirmed in 173Lu and 177Lu but the state as not been assigned in 175Lu. In addition, assignments are proposed for the 1/2-[530] and 3/2-[532] proton orbitals above 1 MeV excitation in all three nuclei.</p> <p>The structure of the odd-odd nucleus 174Lu has also been studied using the (3He,d), (α,t), (3He,α) and (d,t) reactions. The proton transfer data have enabled the assignment of the 1/2-[541], 5/2+[402], 9/2-[514] and the 1/2-[530] proton orbitals coupled to the 5/2 [512] neutron in both spin triplet and singlet configurations. Strong Coriolis coupling has been observed in bands formed by the transfer of the 1/2-[541] and the 1/2-[530] protons. The neutron transfer data have been used to confirm previous assignments of the 5/2-[512], 1/2-[521] and 3/2-[521] neutron orbitals coupled to the 7/2+[404] proton. The observation of levels populated by high-ℓ transfers in the (3He,α) reaction has led to a revised assignment of the Kπ = 7+ , {7/2+[633] + 7/2+[404] } rotational band. Similarly the spin triplet Kπ = 0+ configuration of these two orbitals has also been identified.</p>