B03班_研究成果

♦成果♦　B03班 重元素合成過程の解明に向けた重い中性子過剰核の研究

🍀B03班【研究代表者　西村俊二】でプレスリリースが発表されました(2025.10.9)。

🍀論文発表(査読あり)

2025年度

• Y. Shimizu, K.P. Rykaczewski, N. Fukuda, N.T. Brewer, I. Dillmann, R.K. Grzywacz, S. Nishimura, B.C. Rasco, J.L. Tain, H. Suzuki, H. Takeda, D.S. Ahn, T. Sumikama, N. Inabe, K. Yoshida, H. Ueno, S. Michimasa, A. Algora, J.M. Allmond, J. Agramunt, H. Baba, S. Bae, .G. Bruno, R. Caballero-Folch, F. Calvino, P.J. Coleman-Smith, G. Cortes, T. Davinson, C. Domingo-Pardo, A. Estrade, S. Go, C.J. Griffin, J. Ha, O. Hall, L.J. Harkness-Brennan, J. Heideman, T. Isobe, D. Kahl, M. Karny, L.H. Khiem, T.T. King, G.G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, J. Liu, G. Lorusso, M. Madurga, K. Matsui, K. Miernik, F. Montes, A.I. Morales, P. Morrall, N. Nepal, R.D. Page, V.H. Phong, M. Piersa-Siłkowska, M. Prydderch, V.F.E. Pucknell, M.M. Rajabali, B. Rubio, Y. Saito, H. Sakurai, J. Simpson, M. Singh, D.W. Stracener, A. Tarifeño-Saldivia, S.L. Thomas, A. Tolosa-Delgado, M. Wolinska-Cichocka, P.J. Woods, X.X. Xu, and R. Yokoyama, “Exploration of Neutron-Rich Isotopes around N = 50 via the In-Flight Fission of a 345 MeV/Nucleon 238U Bram“, Prog. Theor. Exp. Phys. 2026, 033D06 (2026)
• H.Y. Wu, Z.H. Li, M. Venaruzzo, L. Colombini, D.W. Luo, H. Hua, S. Nishimura, A. Abba, Y. Venturini, C. Tintori, M. Bianchini, “The upgrade of the general-purpose digital data aquisition system (GDDAQ)“, Nucl. Instrum. Meth. A 1085, 171315 (2026)
• B. Moon, J. Lee, Y. Jang, H. Watanabe, S. Nishimura, V. Phong, Q. Zeng, H. Baba, S. Bae, A.M. Bruce, H. Chen, S. Choi, A. Esmaylzadeh, J. Fischer, L.M. Fraile, N. Fukuda, G. Garcia De Lorenzo, S. Go, A. Gorgen, M. Gorska, S. Guo, K.I. Hahn, J.S. Heines, B. Hong, Y.H. Kim, R. Lozeva, S. Michimasa, M. Mikolajczuk, A.I. Morales, J. Park, S. Pascu, Zs. Podolyak, P.H. Regan, E. Sahin, H. Sakurai, Y. Shimizu, H. uzuki, H. Takeda, Y. Togano, T.T. Yeung, M. Yoshimoto, “Commissioning and performance of IDATEN: A large fast-timing γ-ray detector array at RIBF“, Nucl. Instrum. Meth. A 1084, 171239 (2025)
• Nobuya Nishimura, Crla Frohlich and Thomas Rauscher, “Uncertainties in the production of iron-group nuclides in core-collapse supernovae from Monte Carlo variations of reaction rates“, Month. Not. Roy. Astron. Soc. 546, 1 (2025)
• Kenichi Nakazato, Hajime Togashi, Kohsuke Sumiyoshi, Hideyuki Suzuki, “Role of Symmetry Energy at Subnuclear Densities in Protoneutron Star Crusts”, Progress of Theoretical and Experimental Physics 2025 (2025) 123E01 
• Q.B. Zeng, S. Nishimura, V.H. Phong, S. Yoshida, Z.H Li, Z. Liu, H.Y. Wu, C.Y. Fu, D.S. Hou, H. Ishiyama, Y. Jang, M. Khandelwal, J. Lee, A.I. Morales, T. Niwase, M. Rosenbusch, P. Schury, A. Takamine, M. Wada, W.D. Xian, T.T. Yeung, A. Estrade, N. Fukuda, L. Guo, Y. Hirayama, B. Hong, S. Iimura, Y. Ito, Y.H. Kim, S. Kimura, J. Lee, X. Ma, S. Michimasa, B. Moon, Y.F. Niu, J. Park, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, M. Tanaka, Y. Togano, Y.X. Watanabe, J.M. Yap, M. Yoshimoto, C.X Yuan, F.F. Zeng, J.Z. Zhang, and X.L. Zhi, “β-Decay Half-Lives of Neutron-Rich Sulfur to Potassium: Evolution of the N = 32 and 34 Subshell Closures below Calcium“, Phys. Rev. Lett. 135, 232501 (2025)
• Fumi Nakanishi, Ken’ichiro Nakazato, Masayuki Harada, Yusuke Koshio, Ryuichiro Akaho, Yosuke Ashida, Akira Harada, Masamitsu Mori, Kohsuke Sumiyoshi, Yudai Suwa, Roger A. Wendell, and Masamichi Zairen, “Observing Supernova Neutrino Light Curves with Super-Kamiokande. VI. A Practical Data Analysis Texhnique Considering Realistic Experimental Backgrounds“, Astrophys. Jour 992, 27 (2025)　　
• W. Xian, M. Rosenbusch, V.H. Phong, M. Wada, P. Schury, D. Hou, S. Chen, T. Niwase, Y. Hirayama, H. Ishiyama, S. Iimura, Y. Ito, M. Kojima, S. Kimura, J. Liu, J. Lee, S. Michimasa, H. Miyatake, J.Y. Moon, M. Mukai, S. Nishimura, S. Naimi, T. Sonoda, Y.X. Watanabe, H. Wollnik, and S. Yan, “Atomic mass measurements of neutron-rich nuclides on the path to 78Ni with a β-TOF-equipped MRTOF device“, Front. in Phys. 13, 1644477, (2025)
• S. Kimura, M. Wada, C.Y. Fu, N. Fukuda, Y. Hirayama, D.S. Hou, S. Iimura, H. Ishiyama, Y. Ito, S. Kubono, K. Kusaka, S. Michimasa, H. Miyatake, S. Nishimura, T. Niwase, V. Phong, M. Rosenbusch, H. Schatz, P. Schury, Y. Shimizu, H. Suzuki, A. Takamine, H. Takeda, Y. Togano, Y.X. Watanabe, W.D. Xian, Y. Yanagisawa, T.T. Yeung, M. Yoshimoto, and S. Zha, “Precision Mass Measurements around 84Mo Rule Out ZrNb Cycle Formation in the Rapid Proton-Capture Process at Type I X-Ray Bursts“, Phys. Rev. Lett. 134, 152701 (2025)
• Hiroki Nagakura, Kohsuke Sumiyoshi, Sho Fujibayashi, Yuichiro Sekiguchi, and Masaru Shibata, “Neutrino flavor instabilities in a binary neutron star merger remnant: Roles of a long-lived hypermassive neutron star“, Phys. Rev. D 112, 043029 (2025)
•  Y. Suwa, R. Akaho, Y. Ashida, A. Harada, M. Harada, Y. Koshio, M. Mori, F. Nakanishi, K. Nakazato,  K. Sumiyoshi, R. A. Wendell and M. Zaizen,“Neutrino Constraints on Black Hole Formation in M31”, The Open Journal of Astrophysics, 8 (2025) 
• A. Tolosa-Delgado, J. L. Tain, M. Reichert, A. Arcones, M. Eichler, B. C. Rasco, N. T. Brewer, K. P. Rykaczewski, R. Yokoyama, R. Grzywacz, I. Dillmann, J. Agramunt, D. S. Ahn, A. Algora, H. Baba, S. Bae, C. G. Bruno, R. Caballero Folch, F. Calvino, P. J. Coleman-Smith, G. Cortes, T. Davinson, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, J. Ha, O. Hall, L. Harkness-Brennan, T. Isobe, D. Kahl, M. Karny, L. H. Khiem, G. G. Kiss, M. Kogimtzis, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, J. Lee, J. Liu, G. Lorusso, K. Matsui, K. Miernik, F. Montes, B. Moon, A. I. Morales, N. Nepal, S. Nishimura, R. D. Page, M. Piersa-Silkowska, V. H. Phong, Zs. Podolyak, V. F. E. Pucknell, P. H. Regan, B. Rubio, Y. Saito, H. Sakurai, Y. Shimizu, J. Simpson, P.-A. Soderstrom, D. W. Stracener, T. Sumikama, R. Surman, H. Suzuki, M. Takechi, H. Takeda, A. Tarifeno-Saldivia, S. L. Thomas, M. Wolinska-Cichocka, P. J. Woods, X. X. Xu,“Impact of newly measured 𝛽-Delayed Neutron Emitters around ⁷8Ni on Light Element Nucleosynthesis in the Neutrino Wind Following a Neutron Star Merger”, Phys. Rev. Lett. 134, 172701 (2025)
• A. Aoyama, T. Enoto, T. Takahashi, S. Watanabe, T. Takeda, W. Iwakiri, K. Yamasaki, S. Iwata, N. Ota, A. Jujo, T. Tamagawa, T. Mihara, C.-P. Hu, A. Dohi, N. Nishimura, M. Serino, M. Nakajima, T. Kitaguchi, Y. Kato, N. Kawai, “Thermonuclear Superburst of MAXI J1752-457 Observed with NinjaSat and MAXI”, Astrophys. J. Lett. 986 L29 (2025)
• T. Takeda, T. Tamagawa, T. Enoto, W. Iwakiri, A. Dohi, T. Mihara, H. Takahashi, C.-P. Hu, A. Aoyama, N. Ota, S. Iwata, T. Takahashi, K. Yamasaki, T. Kita, S. Tsuchiya, Y. Nakano, M. Ichibakase, N. Nishimura, “Return of the Clocked Burster: Exceptionally Short Recurrence Time in GS 1826-2381”, Astrophys. J. Lett. 993 129 (2025)
• N. Nishimura, C. Fröhlich, T. Rauscher, “Uncertainties in the production of iron-group nuclides in core-collapse supernovae from Monte Carlo variations of reaction rates”, Month. Not. Roy. Astron. Soc. 546, 1 (2026)

🍀口頭発表(国際的な研究集会での招待講演)

2025年度

• S. Nishimura, “Projects related to Nuclear Astrophysics at RIBF and Future Perspectives”,”Italy-Japan Symposium on Joint Activities in Fundamental Physics“, Mar. 9–12, 2026
• S. Nishimura, “Current Status and Future Plans”,”Top-tier Nuclear Astrophysics Working Group Workshop“, (Zoom), Dec. 22–23, 2025
• S. Nishimura, “Experimental Challenges in Identifying the Sites of r-Process Nucleosynthesis”, “YN and YY interactions and neutron stars”, RIKEN, Japan, Nov. 20, 2025
• N. Nishimura, “Toward astro-physics-driven nuclear-reaction experiments for supernova nucleosynthesis”, “Origin of Elements and Cosmic Evolution”, Beihang University (China), Nov. 10-14 2025.
•  N. Nishimura, “Neutron-capture reactions in nucleosynthesis of p-nuclei”, “Neutron-capture reactions for astrophysical processes”, ECT* (Itary), Nov. 3-7 2025
• S. Nishimura, “Exploring r-Process Signatures in Neutron-Rich Nuclei”, “The 16th Asia Pacific Physics Conference”, Haikou, China, Oct. 19–24, 2025
• S. Nishimura, “A possible study of collective flows in low-energy collisions of deformed nuclei”, “The 2nd International Workshop on Physics at High Baryon Density“, Oct. 16–18, 2025, Wuhan, China
• S. Nishimura, “Investigation of Nuclear Properties relevant to Nuclear Astrophysics”, “Nuclear Astrophysics Experiments with HIAF“, Sep. 03–05, 2025, Huizhou, China
• S. Nishimura, “Overview of Project #4”, “The 2nd Japan-Korea Symposium on TOPTIER Platform in Extreme Rare Isotope Science”, Aug. 19–21, 2025, RIKEN, Japan
• S. Nishimura, “Role of Exotic Nuclei Away from Stability”, “International Symposium on Nuclei in the Cosmos (NIC XVIII)“, June 15–20, 2025, Girona, Spain
• S. Nishimura, “Projects related to Nuclear Astrophysics and TOPTIER”, “The Korean Physical Society Meeting“, April 23–25, 2025, Daejeon, Korea
•   K. Sumiyoshi, “Role of dense matter and neutrinos in core-collapse supernovae and hot neutron stars”, XIIIth International Symposium on Nuclear Symmetry Energy (NuSym25) , 2025.9.8-13 (9.11), Integrated Innovation Building (IIB), RIKEN Kobe Campus, Japan (Invited talk)

🍀口頭発表(国内講演)

2025年度

1.  西村信哉, “超新星爆発と「rプロセス」元素合成”, 「ニュートリノ輸送と原子核から読み解く超新星爆発」, 関東学院大学, 2026年3月12-13日

2. Nobuya Nishimura, “Perspectives on RIBF Experiments on Explosive Nucleosynthesis: A view from Astrophysical Theory”, Advancing physics at next RIBF (ADRIB26), RIKEN, 2026年3月5-6日

3.     S. Li, J. Pang, H. Shen, J. Hu, 住吉光介, “超新星・中性子星の状態方程式における核子有効質量の影響”, 日本物理学会 第80回年次大会

              広島大学(東広島キャンパス), 2025年9月16日〜19日(講演日9.17)

4.     住吉光介, “超新星爆発におけるニュートリノ・原子核物理”, 学術変革(A)「精密数値計算が切り開く宇宙の量子物質科学」領域研究会

              磐梯熱海, 福島県, 2026年3月2日〜4日(講演日3.4)

🍀セミナー発表(招待)

(海外)

1. N. Nishimura, “Multi-messenger Signature of Explosive Nucleosynthesis from Neutron-Star Binaries”, SWIFAR Colloquium, Yunnan University (China), Jun. 10, 2025

2. N. Nishimura, “Multi-messenger signature of explosive nucleosynthesis from neutron-star binaries”, School of Physical Science and Technology Seminar, Xinjang University (China), Aug. 13 2025

(国内)

1. N. Nishimura, “The Diversity of Matter and the Universe: UKAKUREN Workshop 2025 and Beyond”, IPNS Physics and Detector Seminars, KEK, Apr. 16, 2025

https://kds.kek.jp/event/54795

2. 西村信哉, “宇宙における元素の変換と循環 -爆発天体におけるrプロセス元素合成-“, 総合理工研究科「学際研究」・「課外セミナー」, 近畿大学, 2025年5月2日