The decay of neutron-deficient Lu isotopes

Neutron-deficient isotopes of Lu with masses 158, and 160-5 have been produced in /sup 155/Gd(/sup 14/N, xn) and /sup 151/Eu(/sup 16/O, xn) reactions with beams of /sup 14/N and /sup 16/O from the Manchester HILAC. Gamma ray energies and relative intensities have been measured as well as X- gamma , gamma - gamma and beta /sup +/- gamma coincidences. The half-lives and decay energies for beta /sup +//EC decay have been measured. Gamma-gamma correlations and conversion electron single spectra are studied in the case of the even isotopes. Preliminary results are reported. (13 refs)

Systematic behaviour of the neutron-deficient molybdenum nuclei

Excited states in 86,88Mo have been identified using recoil-gamma and gamma-gamma coincidences. Energy-level systematics of the molybdenum isotopes from the N = Z line to the N = 50 shell closure are compared to their strontium and zirconium neighbors. This comparison, an estimate of the B(E 2) strengths, and a Woods-Saxon cranking model have been used to suggest that the molybdenum isotopes undergo a transition from spherical to moderately deformed shapes at 86Mo

Rotational and single-particle structures in ZR-83

The band structure of Zr-83 has been investigated using the Daresbury recoil separator and TESSA array with 20 Compton suppressed Ge detectors and the reaction Si-28 (Ni-58, 2pn) at 195 MeV. DCO ratios have been used to make many new spin assignments. The three known rotational bands have been extended up to the onset of the five quasiparticle bands. On the basis of the 21/2+, 23/2+ and 25/2+ yrast and yrare states, a (3 qp) structure similar to those found in the isotones Kr-79 and Sr-81 has been identified. Additional bands have been observed for the first time, one of which appears to be non-collective. Strong mixing between the various negative parity bands is evident. A multiplet of states feeding the three quasiparticle region of the negative parity yrast band has been found. The data is interpreted in the framework of the cranked shell model