九州大学 研究者情報
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基本情報 研究活動 教育活動 社会活動
坂口 聡志(さかぐち さとし) データ更新日:2020.06.18

准教授 /  理学研究院 物理学部門 基礎粒子系物理学講座


主な研究テーマ
新超重元素の探索
キーワード:超重元素、新元素
2018.03.
偏極陽子共鳴散乱を用いた不安定核の核分光
キーワード:不安定核、陽子共鳴散乱
2013.04.
「アイソスピン一般化陽子弾性散乱」による中性子スキン厚測定法の開発
キーワード:不安定核、中性子スキン
2009.04.
陽子―不安定核間のスピン軌道相互作用に関する研究
キーワード:不安定核、スピン偏極
2004.06.
従事しているプロジェクト研究
119番元素探索実験
2018.06, 代表者:森田浩介, 理化学研究所 / 九州大学, 理化学研究所(日本).
研究業績
主要原著論文
1. K. Hagino and S. Sakaguchi, Subbarrier fusion reactions of an aligned deformed nucleus, Physical Review C, 10.1103/PhysRevC.100.064614, 100, 2019.12, [URL], We discuss heavy-ion fusion reactions of a well-deformed odd-mass nucleus at energies around the Coulomb barrier. To this end, we consider the 16O+165Ho reaction and take into account the effect of deformation of 165Ho using the orientation average formula. We show that fusion cross sections are sensitive to magnetic substates of the target nucleus, and cross sections for the side collision, which are relevant to a synthesis of superheavy elements, may be enhanced by a factor of around two by aligning the deformed target nuclei. We also discuss the effect of alignment on the fusion barrier distribution. We find that, for a particular choice of alignment, the shape of barrier distribution becomes similar to a typical shape of barrier distribution for a deformed nucleus with a negative hexadecapole deformation parameter, β4, even if the intrinsic β4 is positive in the target nucleus..
2. S. Chebotaryov, S. Sakaguchi, T. Uesaka, T. Akieda, Y. Ando, M. Assie, D. Beaumel, N. Chiga, M. Dozono, A. Galindo-Uribarri, B. Heffron, A. Hirayama, T. Isobe, K. Kaki, S. Kawase, W. Kim, T. Kobayashi, H. Kon, Y. Kondo, Y. Kubota, S. Leblond, H. Lee, T. Lokotko, Y. Maeda, Y. Matsuda, K. Miki, E. Milman, T. Motobayashi, T. Mukai, S. Nakai, T. Nakamura, A. Ni, T. Noro, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Park, A. Saito, H. Sakai, M. Sasano, H. Sato, K. Sekiguchi, Y. Shimizu, I. Stefan, L. Stuhl, M. Takaki, K. Taniue, K. Tateishi, S. Terashima, Y. Togano, T. Tomai, Y. Wada, T. Wakasa, T. Wakui, A. Watanabe, H. Yamada, Zh Yang, M. Yasuda, J. Yasuda, K. Yoneda, J. Zenihiro, Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7-2.7 fm -1 as a probe of the nuclear matter density of 6 He, Progress of Theoretical and Experimental Physics, 10.1093/ptep/pty048, 2018, 5, 2018.05, [URL], Differential cross sections of p-6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7-2.7 -1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo..
3. S. Sakaguchi, T. Uesaka, N. Aoi, Y. Ichikawa, K. Itoh, M. Itoh, T. Kawabata, T. Kawahara, Y. Kondo, H. Kuboki, T. Nakamura, T. Nakao, Y. Nakayama, H. Sakai, Y. Sasamoto, K. Sekiguchi, T. Shimamura, Y. Shimizu, and T. Wakui, Shallow and diffuse spin-orbit potential for proton elastic scattering from neutron-rich helium isotopes at 71 MeV/nucleon, Physical Review C, 10.1103/PhysRevC.87.021601, 87, 021601-1-021601-5, 2013.02.
4. S. Sakaguchi, Y. Iseri, T. Uesaka, M. Tanifuji, K. Amos, N. Aoi, Y. Hashimoto, E. Hiyama, M. Ichikawa, Y. Ichikawa, S. Ishikawa, K. Itoh, M. Itoh, H. Iwasaki, S. Karataglidis, T. Kawabata, T. Kawahara, H. Kuboki, Y. Maeda, R. Matsuo, T. Nakao, H. Okamura, H. Sakai, Y. Sasamoto, M. Sasano, Y. Satou, K. Sekiguchi, M. Shinohara, K. Suda, D. Suzuki, Y. Takahashi, A. Tamii, T. Wakui, K. Yako, M. Yamaguchi, and Y. Yamamoto , Analyzing power in elastic scattering of 6He from a polarized proton target at 71 MeV/nucleon, Physics Review C, 10.1103/PhysRevC.84.024604, 84, 024604, 2011.08, [URL].
5. T. Uesaka, S. Sakaguchi, Y. Iseri, K. Amos, N. Aoi, Y. Hashimoto, E. Hiyama, M. Ichikawa, Y. Ichikawa, S. Ishikawa, K. Itoh, M. Itoh, H. Iwasaki, S. Karataglidis, T. Kawabata, T. Kawahara, H. Kuboki, Y. Maeda, R. Matsuo, T. Nakao, H. Okamura, H. Sakai, Y. Sasamoto, M. Sasano, Y. Satou, K. Sekiguchi, M. Shinohara, K. Suda, D. Suzuki, Y. Takahashi, M. Tanifuji, A. Tamii, T. Wakui, K. Yako, Y. Yamamoto, and M. Yamaguchi, Analyzing power for proton elastic scattering from the neutron-rich 6He nucleus, Physical Review C, 10.1103/PhysRevC.82.021602, 82, 021602(R), 2010.08, [URL].
6. Tomomi Kawahara, Satoshi Sakaguchi, Kenichiro Tateishi, Tsz Leung Tang, and Tomohiro Uesaka, Kinetic Parameters of Photo-Excited Triplet State of Pentacene Determined by Dynamic Nuclear Polarization, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.84.044005, 84, 4, 044005-1-044005-7, 2015.03.
主要学会発表等
1. Satoshi Sakaguchi, Isospin-generalized proton elastic scattering as a probe for iso vector density distribution, 9th International Symposium on Nuclear Symmetry Energy (NuSYM2019), 2019.10.
2. Satoshi Sakaguchi, Superheavy element research at RIKEN and Kyushu University, China Japan Joint Nuclear Physics Symposium, 2018.11.
3. Satoshi Sakaguchi, Proton elastic scattering from 6He at 200 A MeV measured with polarized proton target for RI-beam experiments, The IX International Symposium on EXOtic Nuclei (EXON-2018), 2018.09.
4. Satoshi Sakaguchi, Elastic scattering of polarized protons from 6He at 200 A MeV , 13th International Conference on Nucleus-Nucleus Collisions (NN2018), 2018.12.
5. Satoshi Sakaguchi, Study of Fusion Reaction Mechanism for New Elements and New Isotopes, 20th Northeastern Asian Symposium-2018 on Nuclear Physics in the 21st Century, 2018.09.
6. Satoshi Sakaguchi, Elastic scattering of 6He from polarized proton at 200 A MeV, Direct Reactions with Exotic Beams (DREB2018), 2018.06.
7. S. Sakaguchi, Elastic scattering with a polarized target, Physics with Fragment Separators -25th Anniversary of RIKEN-Projectile Fragment Separator (RIPS25), 2015.12.
8. Satoshi Sakaguchi, Studies of unstable nuclei with spin-polarized proton target, The 21st International Symposium on Spin Physics (Spin2014), 2014.10.
9. Satoshi Sakaguchi, Spin-asymmetry measurement in proton resonant scattering from unstable nuclei, Direct Reactions with Exotic Beams (DREB2014), 2014.07.
10. Satoshi Sakaguchi, Study of Unstable Nuclei with Spin-polarized Protons, Nuclear Physics Seminar at Kyungpook University, 2014.02.
11. Satoshi Sakaguchi, Study of Unstable Nuclei with Spin-polarized Protons, Nuclear Physics Seminar at Instutute for Basic Science, 2014.02.
12. S. Sakaguchi, Y. Iseri, T. Uesaka, M. Tanifuji, Aoi, Hiyama, Ichikawa, S. Ishikawa, K. Itoh, M. Itoh, H. Iwasaki, T. Kawabata, T. Kawahara, H. Kuboki, Y. Maeda, T. Nakao, H. Okamura, H. Sakai, Y. Sasamoto, M. Sasano, Y. Satou, K. Sekiguchi, K. Suda, D. Suzuki, A. Tamii, T. Wakui, K. Yako, M. Yamaguchi, and Y. Yamamoto, Analyzing power in elastic scattering of polarized protons from neutron-rich helium isotopes, The 20th International IUPAP Conference on Few-Body Problems in Physics (FB20), 2012.08, [URL].
13. Dr. SAKAGUCHI, Satoshi (Kyushu University); Prof. UESAKA, Tomohiro (CNS, University of Tokyo) ; Dr. IWASAKI, Hironori (MSU) ; Prof. KAWABATA, Takahiro (Kyoto University) ; Ms. KAWAHARA, Tomomi (Toho University) ; Dr. KUBOKI, Hironori (RIKEN) ; Dr. MAEDA, Yukie (Miyazaki University) ; Mr. NAKAO, Taro (University of Tokyo) ; Prof. OKAMURA, Hiroyuki (RCNP, Osaka University) ; Prof. SAKAI, Hideyuki (University of Tokyo) ; Ms. SASAMOTO, Yoshiko (CNS, University of Tokyo) ; Dr. SASANO, Masaki (MSU) ; Dr. WAKUI, Takashi (CYRIC, Tohoku University) ; Prof. SATOU, Yoshiteru (Tokyo Institute of Technology) ; Prof. SEKIGUCHI, Kimiko (Tohoku University) ; Ms. SHINOHARA, Mayuko (Tokyo Institute of Technology) ; Dr. SUDA, Kenji (RIKEN) ; Dr. SUZUKI, Daisuke (MSU) ; Mr. TAKAHASHI, Yoshiyuki (University of Tokyo) ; Prof. TAMII, Atsushi (RCNP, Osaka University) ; Prof. ISERI, Yasunori (Chiba-Keizai College) ; Prof. TANIFUJI, Makoto (Hosei University) ; Dr. YAKO, Kentaro (University of Tokyo) ; Dr. AOI, Nori (RIKEN) ; Dr. YAMAGUCHI, Mitsutaka (RIKN) ; Prof. YAMAMOTO, Yasuo (Tsuru University) ; Ms. HASHIMOTO, Yoshiko (Tokyo Institute of Technology) ; Dr. HIYAMA, Emiko (RIKEN) ; Dr. ICHIKAWA, Yuichi (RIKEN) ; Prof. ISHIKAWA, Souchi (Hosei University) ; Mr. ITOH, Keisuke (Saitama University) ; Dr. ITOH, Masatoshi (CYRIC, Tohoku University), Analyzing power in elastic scattering of 6He and 8He from polarized protons at 71 MeV/u, Advances in Radioactive Isotope Science, 2011.06, [URL].
学会活動
所属学会名
日本物理学会
学協会役員等への就任
2020.04~2022.03, 大阪大学核物理研究センター実験課題採択専門委員会委員, 運営委員.
2020.04~2022.03, 大阪大学核物理研究センター研究計画検討専門委員会委員, 運営委員.
2020.04~2021.03, 日本物理学会九州支部委員, 運営委員.
2019.10~2020.09, 日本物理学会実験核物理領域運営委員, 運営委員.
2017.04~2021.03, 理化学研究所RIビームファクトリー Users Executive Committee, 運営委員.
学会大会・会議・シンポジウム等における役割
2020.11.15~2020.11.20, International Conference on Heavy-Ion Collisions at Near-barrier Energies (FUSION20), Program Committee.
2019.12.01~2019.12.05, 4th International Symposium on Superheavy Elements (SHE2019), Local Organizing Committee.
2019.03.18~2019.03.19, 10th SSRI(第10回停止・低速RIビームを 用いた核分光研究会), 世話人.
2018.07.30~2018.07.31, 超重元素研究の新展開, 世話人.
2012.08.27~2012.08.28, RIBF ULIC-Symposium “Perspective in Isospin Physics”, 座長(Chairmanship).
2016.01.08~2016.01.08, Nuclear physics with Triplet-DNP technique and its application, Organizer.
2016.09.05~2016.09.06, SAMURAI International Collaboration Workshop 2016, Organizer.
学会誌・雑誌・著書の編集への参加状況
2015.12, 日本の核物理の将来レポート, 国内, 編集委員.
受賞
核物理談話会新人賞, 核物理談話会, 2011.05.
The 2-nd Prize of the JINR award in the field of the scientific methodology, JINR, 2012.02.
東京大学大学院理学系研究科研究奨励賞, 東京大学, 2009.03.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2020年度~2024年度, 基盤研究(B), 代表, 核分裂片同時計数検出器による中性子過剰核の融合反応機構研究.
2016年度~2019年度, 基盤研究(C), 代表, 室温超偏極陽子を用いた新しい不安定核分光法の開発.
2013年度~2016年度, 若手研究(B), 代表, 低エネルギー不安定核ビーム実験用の薄膜偏極陽子標的の開発.
2010年度~2012年度, 若手研究(B), 代表, 「アイソスピン一般化陽子弾性散乱」を用いた中性子スキン厚測定法の開発.
2006年度~2008年度, 特別研究員奨励費, 代表, 偏極陽子固体標的を用いた中性子過剰核におけるスピン軌道相互作用の解明.
日本学術振興会への採択状況(科学研究費補助金以外)
2006年度~2008年度, 特別研究員, 代表, 偏極陽子固体標的を用いた中性子過剰核におけるスピン軌道相互作用の解明.

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