Speaker
Description
The method [1] for measuring the total σR and partial cross-sections of nuclear reactions and the results of applying the method in studying the energy dependence $σ_R(E)$ in reactions with neutron-rich isotopes He, Li, Be and B [2-4] are presented. Secondary beams of the studied nuclei were obtained at the fragment separator ACCULINNA of the accelerator U400M, FLNR JINR.
A comparative analysis of the developed methodology with other methods is provided.
The created method is based on the registration in a solid angle close to the total Ω = 4π of cascades of γ-quanta accompanying nuclear reactions and includes: taking into account the dependence $ε(Mγ)$ - the efficiency of registration by the spectrometer of cascades of γ-quanta of multiplicity Mγ and its distribution from k the number of detectors that have worked $wM$γ($k$). The characteristics were measured using the γ-β-γ coincidence method using a $^{60}Co$ source.
The presented technique allows obtaining the values of the dependences of the total reaction cross-sections on the energy $σ_R(E)$ and on the number of triggered detectors $σ_R(k)$.
For the first time, $σ_R(E)$ and $σ_R(k)$ were measured for the reactions $^{6,8}$He, $^{8,9,11}$Li, $^{10,11,12}$Be, $^{14}$B+$^{28}$Si,$^{59}$Co,$^{181}$Ta in the little-studied beam energy range $E_{LAB}$ = 5÷50 MeV/nucleon. Analysis of the results obtained using the new method for measuring $σ_R(E)$ made it possible to determine the contributions of the partial cross sections of reaction channels accompanied by cascades of low-multiplicity $M$γ γ-quanta.
This research was funded by the Russian Science Foundation, project № 24-22-00117.
References
- S. S. Stukalov et al., PEPAN Lett., Vol. 21, No. 3, pp. 508–517, (2024);
- Yu. E. Penionzhkevich et al., Phys. Rev. C 99, 014609 (2019);
- Yu. G. Sobolev et al., Bull. Rus. Acad. Sci. Phys., Vol. 84, No. 8, pp. 948–956, (2020);
- Yu. G. Sobolev et al., Phys. Rev. C 110, 014609 (2024);
