Single-particle transfer studies of ¹⁸⁴Re

Abstract

The level structure of odd-odd lU4Re has been investigated by means of the (3He,d) and (a,t) reactions on IR3W and the (d,t) and (3He,a) reactions on IuSRe. Measured relative Q values have been used to deduce the Iu4Re mass. The spectra are interpreted in terms of two-quasiparticle states formed by the coupling of the transferred particle and the odd particle in the target ground state, each in separate Nilsson orbitals. Identification of rotational bands is based on a comparison of the measured cross-section patterns and energy spacings with those predicted with the aid of Coriolis mixing and DWBA calculations. Assignments are proposed, some tentatively, for the bands arising from both the parallel and antiparallel coupling of the 5/2+[402] proton orbital with the 112-[510], 312-[512], 712-[503], and 11/2+[615] neutron orbitals. La structure des niveaux du noyau impair-impair Is4Re a Cte exploree au moyen des reactions ('He,d) et (a,t) sur Is3W, ainsi que des rCactions(d,t) et (3He,a) sur IuSRe. Des valeurs relatives de Q mesurees ont ete utilisees pour dkduire la masse de lU4Re. Les spectres sont interpretes en termes d'etats a deux quasi-particules form& par le couplage de la particule transferee et de la particule non appariee dans 1'Ctat fondamental du noyau cible, chacune Ctant dans une orbitale de Nilsson distincte. L'identification des bandes rotationnelles est basee sur une comparaison des valeurs mesurees pour les sections efficaces et les espacements entre les niveaux avec les predictions formulCes a I'aide de calculs DWBA et de melange Coriolis. Des attributions sont proposees, quelques-unes a titre d'essai, pour les bandes resultant du couplage parallele et antiparalleledel'orbitale protonique 5/2+[402] aveclesorbitales neutroniques 112-[5 101,312-[512], 712-[503] et 1 1/2+[615]. --Can.

Evidence for Gallagher-Moszkowski doublets in 180Ta

“…2) The initial values of these parameters are varied in order to obtain the best agreement between theory and experiment in reproducing (i) the energy spectrum, (ii) the angular distribution shapes and (iii) the absolute cross section [11].…”