Structure of isobaric analog states in 91Nb populated by the 90Zr(a,t) reaction
H. K. T. van der Molen, H. Akimune, A. M. van den Berg, I. Daito, H. Fujimura, Y. Fujita, M. Fujiwara, M. N. Harakeh, F. Ihara, T. Inomato, K. Ishibashi, J. Janecke, N. Kalantar-Nayestanaki, H. Laurent, I. Lhenry, T. W. O'Donnell, V. A. Rodin, A. Tamii, H. Toyokawa, M. H. Urin, H. Yoshida, M. Yosoi
Abstract
Decay via proton emission of isobaric analog states (IAS's) in 91Nb was studied using the 90Zr(α,t) reaction at Eα=180 MeV. This study provides information about the damping mechanism of these states. Decay to the ground state and low-lying phonon states in 90Zr was observed. The experimental data are compared with theoretical predictions wherein the IAS `single-particle' proton escape widths are calculated in a continuum RPA approach. The branching ratios for decay to the phonon states are explained using a simple model.
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