Abstract
The large variety of experimental information on M1 excitations in 232Th and 236,238U, obtained from (γ,γ′), (e,e′) and (p,p′) experiments, is described in QRPA with a deformed Woods-Saxon potential and separable residual interactions. The most accurate experimental data on the low-energy orbital excitations, including their (e,e′) form factors, are well reproduced. The influence of different parametrizations of the spin-orbit and spin-spin forces on the spin M1 strength distribution is studied and the two maxima of this strength are interpreted as isoscalar and isovector ones. The role of the spin-independent residual interaction for the promotion or suppression of the scissors mode is discussed. It is found that the scissors mode fragments mainly (70%) over the low-lying orbital 1 + states and most of the strongest experimentally observed M1 excitations can be interpreted as performing a weakly collective scissors motion.
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