Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Guttormsen, M. and Bernstein, L. A. and Görgen, A. and Jurado, B. and Siem, S. and Aiche, M. and Ducasse, Q. and Giacoppo, F. and Gunsing, F. and Hagen, T. W. and Larsen, A. C. and Lebois, M. and Leniau, B. and Renstrøm, T. and Rose, S. J. and Tornyi, Tamás Gábor and Tveten, G. M. and Wiedeking, M. and Wilson, J. N. (2014) Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes. PHYSICAL REVIEW C, 89 (1). ISSN 2469-9985

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Abstract

The γ-ray strength function in the quasicontinuum has been measured for 231-233Th, 232,233Pa, and 237-239U using the Oslo method. All eight nuclei show a pronounced increase in γ strength at ωSR≈2.4 MeV, which is interpreted as the low-energy M1 scissors resonance (SR). The total strength is found to be BSR=9-11μN2 when integrated over the 1-4 MeV γ-energy region. The SR displays a double-hump structure that is theoretically not understood. Our results are compared with data from (γ, γ′) experiments and theoretical sum-rule estimates for a nuclear rigid-body moment of inertia. © 2014 American Physical Society.

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