First SMMC calculations of M1 gamma strength functions in actinides show low-energy enhancement persisting in this mass region along with scissors mode.
Scissors resonance in the quasi-continuum of Th, Pa and U isotopes
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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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Low-energy enhancement in the magnetic dipole radiation of actinide nuclei
First SMMC calculations of M1 gamma strength functions in actinides show low-energy enhancement persisting in this mass region along with scissors mode.