Cluster formation in neutron-rich Be and B isotopes

• Material Type: 博士論文
• Title: Cluster formation in neutron-rich Be and B isotopes
• Author/Editor: 本木, 英陽
• Author Heading: 本木, 英陽
• Publication, Distribution, etc.: Hokkaido University
• Publication Date: 2023-03-23
• Publication Date (W3CDTF): 2023-03-23
• Alternative Title: 中性子過剰なBeとB同位体におけるクラスター形成
• Degree grantor/type: 北海道大学
• Date Granted: 2023-03-23
• Date Granted (W3CDTF): 2023-03-23
• Dissertation Number: 甲第15278号
• Degree Type: 博士(理学)
• Text Language Code: eng
• NDC: 400
• Target Audience: 一般
• Note (General): 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.; (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; 理学院（宇宙理学専攻）
• DOI: 10.14943/doctoral.k15278; https://doi.org/10.14943/doctoral.k15278
• Persistent ID (NDL): info:ndljp/pid/12911393; https://dl.ndl.go.jp/pid/12911393
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• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2023-07-08T03:42:31+09:00
• Format (IMT): application/pdf
• Access Restrictions: 国立国会図書館内限定公開
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• Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k15278; http://hdl.handle.net/2115/89586
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• Summary, etc.: This dissertation is based on [1]: (H. Motoki, Y. Suzuki, T. Kawai, and M. Kimura, Progress of Theoretical and Experimental Physics 2022(11), 113D01 (...