Eur. Phys. J. A (2003) 20: 97-100
https://doi.org/10.1140/epja/i2002-10330-3

Two-quasiparticle bands in neutron-rich nuclei

¹ Department of Physics and Astronomy, The University of Manchester, M13 9PL, Manchester, UK
² Institute of Experimental Physics, Warsaw University, 00-681, Warszawa, Poland

^* e-mail: nsd@mags.ph.man.ac.uk

Abstract

The large multi-detector arrays such as EUROBALL and GAMMASPHERE have made possible the study of the spectroscopy of neutron-rich nuclei through the observation of discrete, prompt -rays emitted following fission. Most of the information obtained has concerned yrast states and collective excitations. In the present work, a search has been made for excited bands based upon two-quasiparticle intrinsic structures. Such bands have been found in several even-even nuclei from ⁹⁶Sr to ¹¹²Pd. Careful analysis of triple-coincidence spectra has been performed in order to determine branching ratios within the bands. These branching ratios are then used to establish the magnetic properties of the intrinsic structure, permitting, in most cases, the determination of which Nilsson orbits (and whether they are neutron or proton states) are contributing to the excitation. Some example results from this search are presented.