Scissors resonance in the quasi-continuum of Th, Pa and U isotopes
- GUTTORMSEN, M.
- BERNSTEIN, L. A.
- GÖRGEN, A.
- JURADO, B.
- SIEM, S.
- AICHE, M.
- DUCASSE, Q.
- GIACOPPO, F.
- GUNSING, F.
- HAGEN, T. W.
- LARSEN, A. C.
- LEBOIS, M.
- LENIAU, B.
- RENSTRØM, T.
- ROSE, S. J.
- TORNYI, T. G.
- TVETEN, G. M.
- WIEDEKING, M.
- WILSON, J. N.
Publication date
January 2014
DOI Publisher
American Physical Society (APS) Journal
Physical Review CAbstract
The gamma-ray strength function in the quasi-continuum has been measured for 231-233Th, 232,233Pa and 237-239U using the Oslo method. All eight nuclei show a pronounced increase in gamma strength at omega_SR approx 2.4 MeV, which is interpreted as the low-energy M1 scissors resonance (SR). The total strength is found to be B_SR = 9-11 mu_N^2 when integrated over the 1 - 4 MeV gamma-energy region. The SR displays a double-hump structure that is theoretically not understood. Our results are compared with data from (gamma, gamma') experiments and theoretical sum-rule estimates for a nuclear rigid-body moment of inertia
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