Specific features of capture reactions of real and virtual α-particles by 6Li and 7Li isotopes

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY Recent Contributions to Physics Pub Date : 2022-03-01 DOI:10.26577/rcph.2022.v80.i1.01
M. Zhusupov, K. Zhaksybekova, R. Kabatayeva, A. Kopenbayeva, E. E. Dadanbekov
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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.
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6Li和7Li同位素捕获实α-粒子和虚α-粒子的具体特征
本文研究了虚α粒子和实α粒子与同位素6 Li和7 Li相互作用与10 B和11 B核基态和激发态形成的特征。采用多粒子壳层模型来描述原子核的结构。10b和11b原子核的结构特点和捕获α粒子的不同机制解释了10b和11b原子核在捕获实粒子和虚粒子时激发谱的显著差异。真实的α粒子在反应(α, γ)中被捕获,而虚拟的α粒子在锂簇转移反应中被捕获。在两种硼同位素中,第一个衰变通道都是α -粒子,然后有几个MeV的能量范围,直到下一个衰变通道发射粒子。此外,在这个能量范围内,s因子异常小。如果激发态能级高于原子核分裂的阈值并发射某些粒子α,则s因子与衰变的部分宽度Г α有关。光谱因子不依赖于能量,只由初始和最终状态的结构决定,与之相反,部分Γ -宽度取决于粒子发射时的能量。结果表明,在从粒子发射的第一阈值到第二阈值的较窄能量范围内,实α粒子和虚α粒子激发残余核的截面有显著差异。在辐射α俘获反应中形成的具有大截面的γ量子窄束可用于热核等离子体的诊断。
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