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

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.

preprint2013arXivOpen access
M. GuttormsenL. A. BernsteinA. GörgenB. JuradoS. SiemM. AicheQ. DucasseF. GiacoppoF. GunsingT. W. HagenA. C. LarsenM. LeboisB. LeniauT. RenstrømS. J. RoseT. G. TornyiG. M. TvetenM. WiedekingJ. N. Wilson
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M. GuttormsenL. A. BernsteinA. GörgenB. JuradoS. SiemM. AicheQ. DucasseF. GiacoppoF. GunsingT. W. HagenA. C. LarsenM. LeboisB. LeniauT. RenstrømS. J. RoseT. G. TornyiG. M. TvetenM. WiedekingJ. N. Wilson

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