Speaker
Description
The scissors mode is investigated in the actinide region, including even-even superheavy nuclei up to $^{256}$No, within the Time Dependent Hartree-Fock-Bogoliubov (TDHFB) approach. The solution of TDHFB equations by the Wigner Function Moments (WFM) method predicts a splitting of the scissors mode into three intermingled branches due to spin degrees of freedom [1]. Both the calculated energy centroid and integrated $M1$ strength in $^{254}$No are in good agreement with the results of recent measurements performed by the Oslo method [2]. The energy centroids and summed $B(M1)$ values for other transuranium nuclides are predicted.
The calculations are performed also for $^{232}$Th and $^{236,238}$U isotopes. The scissors resonance in many actinide region nuclei exhibits a prominent double-hump structure [3,4]. The WFM analysis allows to assume that the observed splitting of scissors resonance can occur due to the separation of conventional scissors and spin-scissors excitations.
[1] E. B. Balbutsev, I.V. Molodtsova, A. V. Sushkov, N. Yu. Shirikova, P. Schuck, Phys. Rev. C 105, 044323 (2022)
[2] F. L. Bello Garrote, A. Lopez-Martens, A.C. Larsen, I. Deloncle, S. Peru et al.,
Phys. Lett. B 834, 137479 (2022)
[3] A. S. Adekola, C. T. Angell, S. L. Hammond, A. Hill, C. R. Howell, H. J. Karwowski, J. H. Kelley, E. Kwan, Phys. Rev. C 83, 034615 (2011)
[4] M. Guttormsen, L. A. Bernstein, A. Gorgen, B. Jurado, S. Siem et al., Phys. Rev. C 89, 014302 (2014)
| Section | Nuclear structure: theory and experiment |
|---|
