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Scissors resonance in the quasi-continuum of Th, Pa and U isotopes

Abstract : 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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Submitted on : Monday, November 25, 2013 - 11:23:35 AM
Last modification on : Sunday, June 26, 2022 - 12:00:10 PM

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M. Guttormsen, L. A. Bernstein, A. Görgen, B. Jurado, S. Siem, et al.. Scissors resonance in the quasi-continuum of Th, Pa and U isotopes. Physical Review C, American Physical Society, 2014, 89, pp.014302. ⟨10.1103/PhysRevC.89.014302⟩. ⟨in2p3-00908733⟩



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