M. Zhusupov, K. Zhaksybekova, R. Kabatayeva, A. Kopenbayeva, E. E. Dadanbekov
{"title":"Specific features of capture reactions of real and virtual α-particles by 6Li and 7Li isotopes","authors":"M. Zhusupov, K. Zhaksybekova, R. Kabatayeva, A. Kopenbayeva, E. E. Dadanbekov","doi":"10.26577/rcph.2022.v80.i1.01","DOIUrl":null,"url":null,"abstract":"Li isotopes The article examines the features of the interaction of virtual and real α -particles with isotopes 6 Li and 7 Li with the formation of the ground and excited states of 10 B and 11 B nuclei. The multiparticle shell model is used to describe the structures of nuclei. The significant difference in the excitation spectra of 10 B and 11 B nuclei in the capture of real and virtual α -particles is explained by the structural features of these nuclei and different mechanisms of capture of α -particles. Real α -particles are captured in reactions ( α , γ ), and virtual ones – in lithium cluster transfer reactions. In both boron isotopes, the first decay channel is the α -particle, then there is an energy range of several MeV until the next decay channel with the emission of particles. Moreover, in this energy range, the S-factors are anomalously small. If the excited levels lie above the threshold for the breakup of the nucleus with the emission of certain particles α , then the S-factors turn out to be related to the partial widths of the decay Г α . In contrast to spectroscopic factors, which do not depend on energy and are determined only by the structure of the initial and final states, the partial Γ -widths depend on the energy which the particles are emitted with. It is shown that, in a narrow energy range from the first threshold for the emission of particles to the second threshold, the cross sections for the excitation of residual nuclei by real and virtual α -particles differ significantly. Narrow beams of γ -quanta formed with large cross sections in reactions of radiative α capture can be used for diagnostics of thermonuclear plasma.","PeriodicalId":29678,"journal":{"name":"Recent Contributions to Physics","volume":null,"pages":null},"PeriodicalIF":0.2000,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Recent Contributions to Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.26577/rcph.2022.v80.i1.01","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Li isotopes The article examines the features of the interaction of virtual and real α -particles with isotopes 6 Li and 7 Li with the formation of the ground and excited states of 10 B and 11 B nuclei. The multiparticle shell model is used to describe the structures of nuclei. The significant difference in the excitation spectra of 10 B and 11 B nuclei in the capture of real and virtual α -particles is explained by the structural features of these nuclei and different mechanisms of capture of α -particles. Real α -particles are captured in reactions ( α , γ ), and virtual ones – in lithium cluster transfer reactions. In both boron isotopes, the first decay channel is the α -particle, then there is an energy range of several MeV until the next decay channel with the emission of particles. Moreover, in this energy range, the S-factors are anomalously small. If the excited levels lie above the threshold for the breakup of the nucleus with the emission of certain particles α , then the S-factors turn out to be related to the partial widths of the decay Г α . In contrast to spectroscopic factors, which do not depend on energy and are determined only by the structure of the initial and final states, the partial Γ -widths depend on the energy which the particles are emitted with. It is shown that, in a narrow energy range from the first threshold for the emission of particles to the second threshold, the cross sections for the excitation of residual nuclei by real and virtual α -particles differ significantly. Narrow beams of γ -quanta formed with large cross sections in reactions of radiative α capture can be used for diagnostics of thermonuclear plasma.