Affiliation:
1. Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
Abstract
Neutron decay of the isoscalar giant dipole resonance (ISGDR) has been studied in 90 Zr , 116 Sn and 208 Pb using the (α,α′) reaction at a bombarding energy of 200 MeV. The same reaction was used to study proton decay of the ISGDR in 58 Ni and 208 Pb . Neutron and proton decay of the ISGDR to low-lying neutron and proton hole states in the daughter nuclei, respectively, allowed an experimental determination of the ISGDR microscopic structures. The determined branching ratios are compared to recent continuum random-phase-approximation (CRPA) calculations. Reasonable agreement was observed for 208 Pb and 58 Ni , whereas strong differences for 90 Zr and 116 Sn were found.
Publisher
World Scientific Pub Co Pte Lt
Subject
General Physics and Astronomy,Nuclear and High Energy Physics