Scissors resonance in the quasi-continuum of Th, Pa and U isotopes - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2014

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

M. Guttormsen
  • Function : Author
L. A. Bernstein
  • Function : Author
A. Görgen
  • Function : Author
S. Siem
  • Function : Author
F. Giacoppo
  • Function : Author
T. W. Hagen
  • Function : Author
A. C. Larsen
  • Function : Author
T. Renstrøm
  • Function : Author
S. J. Rose
  • Function : Author
T. G. Tornyi
  • Function : Author
G. M. Tveten
  • Function : Author
M. Wiedeking
  • Function : Author
J. N. Wilson

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.

Dates and versions

in2p3-00908733 , version 1 (25-11-2013)

Identifiers

Cite

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, 2014, 89, pp.014302. ⟨10.1103/PhysRevC.89.014302⟩. ⟨in2p3-00908733⟩
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