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Cluster formation in neutron-rich Be and B isotopes
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| Title: | Cluster formation in neutron-rich Be and B isotopes |
| Other Titles: | 中性子過剰なBeとB同位体におけるクラスター形成 |
| Authors: | 本木, 英陽 Browse this author |
| Issue Date: | 23-Mar-2023 |
| Publisher: | Hokkaido University |
| Abstract: | This dissertation is based on [1]: (H. Motoki, Y. Suzuki, T. Kawai, and M. Kimura, Progress of Theoretical and Experimental Physics 2022(11), 113D01 (2022) https://doi.org/10.1093/ptep/ptac145).Background:Recently, experiments performed using the (p, pα) reactions have revealed anegative correlation between the α cluster formation and neutron number in Sn isotopes, showing a trend opposite to that predicted theoretically in Be and B isotopes. Although the observed charge radii of the Be and B isotopes suggest the formation of clusters as the neutron drip-line is approached, these radii themselves are not a physical quantity that can directly probe the cluster structure. Purpose: I directly investigate the cluster formation in Be and B isotopes as the neutron drip-line is approached to elucidate the effect of excess neutrons for the possibilities of 6He and 8He clustering as well as α clustering. Method: All nuclei are described by antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM) framework. The cluster formations are directly analyzed by the spectroscopic factors (S-factor) of 6He and 8He clusters as well as α clusters using the Laplace expansion method. Results: Sum of the S-factors, i.e. S(α), S(6He), and S(8He), increases as the neutron drip-line approaches although S(α) decreases. This behavior might be correlated with the enhancement of clustering which is analyzed by the intrinsic proton density distributions. Conclusions: The results indicate that the excess neutrons contribute to yield 6He and 8He clusters as well as α clusters. The decrease in S(α) toward the neutron dripline in Be and B isotopes is due to considering only the ground state of the residual nuclei, meaning that it does not indicate that α cluster formation is not increased. Thus, S(α) is not enough to estimate the enhancement of clustering in Be and B isotopes. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第15278号 |
| Degree Level: | 博士 |
| Degree Discipline: | 理学 |
| Examination Committee Members: | (主査) 教授 木村 真明, 教授 岡本 崇, 准教授 平林 義治, 客員准教授 堀内 渉 |
| Degree Affiliation: | 理学院（宇宙理学専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/89586 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 理学院(Graduate School of Science)
学位論文 (Theses) > 博士 （理学）
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