Speaker
Description
Recently, it has proposed by Yu. Ts. Oganessian to study the influence of structural effects in calcium isotopes on the reaction mechanism, fusion-fission and quasi-fission cross sections, and characteristics of reaction fragments. For this purpose, the reactions 40,42,44,48Ca + 208Pb were chosen. Experiments 40,48Ca + 208Pb were carried out at the U-400 accelerator in FLNR JINR. The obtained data are currently being analyzed.
The following work is dedicated to theoretical studies the fusion mechanisms in 40,42,44,48Ca+208Pb at energies around the Coulomb barrier. The corresponding calculations of the fusion (capture) cross section have been performed with the standard quantum coupled-channels (QCC) approach (accounting for vibrational and rotational excitations) with the empirical model for additional channels of neutron rearrangement. The partial penetration probability though the multidimensional potential barrier is obtained in the QCC calculations. The probability of transfer up to four neutrons to states within a certain Q-window is estimated in semiclassical approximation [A. V. Karpov, V. A. Rachkov, and V. V. Samarin, Physical Review, C92 (2015) 064603]. The results are compared with the experimental data. The predictions of the fusion (capture) cross section for 42,44Ca+208Pb at energies around the Coulomb barrier have been also presented.
| Section | Nuclear physics (Section 1) |
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