Lifetime measurements of highly charged radioactive ions in storage rings

• Project/Area Number: 17H01123
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Saitama University
• Principal Investigator: Yamaguchi Takayuki 埼玉大学, 理工学研究科, 准教授 (10375595)
• Co-Investigator(Kenkyū-buntansha): 山口 由高 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 技師 (40415328) ; 洲嵜 ふみ 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究職 (70779727) ; 長江 大輔 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 協力研究員 (60455285)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥44,200,000 (Direct Cost: ¥34,000,000、Indirect Cost: ¥10,200,000); Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2019: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000); Fiscal Year 2018: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000); Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
• Keywords: 実験核物理 / 蓄積リング / 多価イオン / RIビーム

Outline of Final Research Achievements

This program aims at a new development which enables in-flight decay measurements of highly charged exotic ions, by exploiting recently built heavy-ion storage ring, Rare-RI Ring, at the RI Beam Factory in RIKEN. Major developments achieved so far are following: a compact high-sensitive Schottky detector which non-destructively detects single ions stored in the storage ring, a new beam circulation monitor which measures high-energy secondary electrons emitted from a thin foil, and a long scintillating fiber detector installed along the ring circumference for decaying daughter detection.

Academic Significance and Societal Importance of the Research Achievements

開発した検出器群によって、多価イオン状態で崩壊するエキゾチック原子核の寿命を飛行中に測定することができる。原子核の寿命は軌道電子の有無によって劇的に変化することがある（例えばγ崩壊と内部転換電子崩壊が競合する場合）。このような条件は星の中にあると考えられるため鉄からウランまでの重元素合成過程の理解に鍵となる情報となる。開発したショットキー検出器で短時間に単一粒子（親核）を非破壊的に測定し、蓄積リング周長に配置したファイバー検出器によって娘核を測定する。本研究のバックグラウンドがない効率的な測定は他の装置では不可能である。

Research Products

• [Int'l Joint Research] GSI/Max-Planck Institute/Giessen Univ.(ドイツ)
• [Int'l Joint Research] IMP/Beihang Univ.(中国)
• [Int'l Joint Research] GSI/Max-Planck Institute/Giessen Univ(ドイツ)
• [Int'l Joint Research] IMP/Beihang Univ(中国)
• [Journal Article] Development and operation of a time-of-flight detector to confirm particle storage at the Rare-RI Ring (2021)
  • Author(s): D. Nagae et al.
  • Journal Title: Nuclear Inst. and Methods in Physics Research, A Volume: 986 Pages: 164713-164713
  • DOI: 10.1016/j.nima.2020.164713
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental Challenges of the First Mass Measurement Campaign at the Rare-RI Ring (2020)
  • Author(s): S. Naimi et al.
  • Journal Title: Journal of Physics: Conference Series Volume: 1643 Issue: 1 Pages: 012058-012058
  • DOI: 10.1088/1742-6596/1643/1/012058
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mass measurements for the Tz = －2 fp-shell nuclei 40Ti, 44Cr, 46Mn, 48Fe, 50Co, and 52Ni (2020)
  • Author(s): C. Y. Fu, Y. H. Zhang M. Wang, X. H. Zhou, Yu. A. Litvinov, K. Blaum, H. S. Xu, X. Xu, P. Shuai, Y. H. Lam, R. J. Chen, X. L. Yan, X. C. Chen, J. J. He, S. Kubono, M. Z. Sun, X. L. Tu, Y. M. Xing, Q. Zeng, X. Zhou, W. L. Zhan, S. Litvinov, G. Audi, T. Uesaka, T. Yamaguchi, A. Ozawa, B. H. Sun, Y. Sun, F. R. Xu,
  • Journal Title: Phys. Rev. C Volume: 102 Issue: 5 Pages: 054311-054311
  • DOI: 10.1103/physrevc.102.054311
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nuclear physics research at heavy ion accelerators: Precision studies with stored and cooled exotic nuclei (2020)
  • Author(s): Yu.A. Litvinov, Th. Stoehlker, X.W. Ma, Y.H. Zhang, T. Yamaguchi,
  • Journal Title: J. Phys. Conf. Ser. Volume: 1401 Issue: 1 Pages: 012001-012001
  • DOI: 10.1088/1742-6596/1401/1/012001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Efficiency and timing performance of time-of-flight detector utilizing thin foils and crossed static electric and magnetic fields for mass measurements with Rare-RI Ring facility (2020)
  • Author(s): S. Suzuki, A. Ozawa, D. Kamioka, Y. Abe, M. Amano, H. Arakawa, Z. Ge, K. Hiraishi, Y. Ichikawa, K. Inomata, A. Kitagawa, T. Kobayashi, Hg. Li, T. Matsumoto, T. Moriguchi, M. Mukai, D. Nagae, S. Naimi, S. Omika, S. Sato, Y. Tajiri, K. Wakayama, T. Yamaguchi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume: 965 Pages: 163807-163807
  • DOI: 10.1016/j.nima.2020.163807
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit (2020)
  • Author(s): J.H. Liu, X. Xu, P. Zhang, P. Shuai, X.L. Yan, Y.H. Zhang, M. Wang, Yu.A. Litvinov, H.S. Xu, K. Blaum, et al.
  • Journal Title: Nucl. Instrum. Methods Phys. Res. B Volume: 463 Pages: 138-142
  • DOI: 10.1016/j.nimb.2019.06.007
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of a new in-ring beam monitor in the Rare-RI Ring (2019)
  • Author(s): S. Omika, T. Yamaguchi, N. Tadano, Y. Abe, M. Amano, Z. Ge, D. Kamioka, T. Moriguchi, D. Nagae, S. Naimi, A. Ozawa, F. Suzaki, S. Suzuki, T. Suzuki, T. Uesaka, M. Wakasugi, K. Wakayama, Y. Yamaguchi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 463 Pages: 241-243
  • DOI: 10.1016/j.nimb.2019.05.029
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Scheme of high-resolution identification and selection of secondary ions for mass measurements with the Rare-RI Ring (2019)
  • Author(s): Z. Ge, T. Uesaka, S. Naimi, D. Nagae, Y. Abe, S. Omika, F. Suzaki, T. Yamaguchi, Y. Yamaguchi, M. Wakusugi, H. Li, K. Wakayama, H. Arakawa, K. Inomata, K. Nishimuro, T. Kobayashi, A. Ozawa, S. Hosoi, Y. Inada, S. Suzuki, T. Moriguchi, M. Mukai, M. Amano, D. Kamioka, Y. Yano,
  • Journal Title: Hyp. Int. Volume: 240 Issue: 1
  • DOI: 10.1007/s10751-019-1599-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Masses of ground and isomeric states of 101In and configuration-dependent shell evolution in odd-A indium isotopes (2019)
  • Author(s): X. Xu, J. H. Liu, C. X. Yuan, Y. M. Xing, M. Wang, Y. H. Zhang, X. H. Zhou, Yu. A. Litvinov, K. Blaum, R. J. Chen, et al.
  • Journal Title: Phys. Rev. C Volume: 100 Issue: 5 Pages: 051303-051303
  • DOI: 10.1103/physrevc.100.051303
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The development of in-ring reaction measurements at the HIRFL-CSR (2019)
  • Author(s): J.T. Zhang, K. Yue, H.X. Li, X.L. Tu, C.J. Shao, P. Ma, B. Mei, X.C. Chen, Y.Y. Yang, X.Q. Liu, Y.M. Xing K.H. Fang, Z.Y. Sun, M. Wang Yu. A. Litvinov, T. Yamaguchi, P. Egelhof, Y.H. Zhang, X.H. Zhou,
  • Journal Title: Nucl. Instrum. Methods Phys. Res. A Volume: 948 Pages: 162848-162848
  • DOI: 10.1016/j.nima.2019.162848
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] New test of modulated electron capture decay of hydrogen-like 142Pm ions: Precision measurement of purely exponential decay (2019)
  • Author(s): F.C. Ozturk, B. Akkus, D. Atanasov, H. Beyer, F. Bosch, D. Boutin, C. Brandau, P. Buehler, R.B. Cakirli, R.J. Chen, et al.
  • Journal Title: Phys. Lett. B Volume: 797 Pages: 134800-134800
  • DOI: 10.1016/j.physletb.2019.134800
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Masses of neutron-rich 52-54Sc and 54,56Ti nuclides: The N = 32 subshell closure in scandium (2019)
  • Author(s): X. Xu, M. Wang, K. Blaum, J. D. Holt, Yu. A. Litvinov, A. Schwenk, J. Simonis, S. R. Stroberg, Y. H. Zhang, H. S. Xu, et l.
  • Journal Title: Phys. Rev. C Volume: 99 Issue: 6 Pages: 064303-064303
  • DOI: 10.1103/physrevc.99.064303
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes (2018)
  • Author(s): Y.M. Xing, K.A. Li, Y.H. Zhang, X.H. Zhou, M. Wang, Yu.A. Litvinov, K. Blaum, S. Wanajo, S. Kubono, G. Martinez-Pinedo, et al.
  • Journal Title: Phys. Lett. B Volume: 781 Pages: 358-363
  • DOI: 10.1016/j.physletb.2018.04.009
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Masses of the Tz = －3/2 nuclei 27P and 29S (2018)
  • Author(s): C. Y. Fu, Y. H. Zhang, X. H. Zhou, M. Wang, Yu. A. Litvinov, K. Blaum, H. S. Xu, X. Xu, P. Shuai, Y. H. Lam, et al.
  • Journal Title: Phys. Rev. C Volume: 98 Issue: 1 Pages: 014315-014315
  • DOI: 10.1103/physrevc.98.014315
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Isochronous mass measurements of Tz = -1 fp-shell nuclei from projectile fragmentation of 58Ni (2018)
  • Author(s): Y. H. Zhang, P. Zhang, X. H. Zhou, M. Wang, Yu. A. Litvinov, H. S. Xu, X. Xu, P. Shuai, Y. H. Lam, R. J. Chen, et al.
  • Journal Title: Phys. Rev. C Volume: 98 Issue: 1 Pages: 014319-014319
  • DOI: 10.1103/physrevc.98.014319
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Application of isochronous mass spectrometry for the study of angular momentum population in projectile fragmentation reactions (2017)
  • Author(s): X. L. Tu, A. Kelic-Heil, Yu. A. Litvinov, Zs. Podolyak, Y. H. Zhang, W. J. Huang, H. S. Xu, K. Blaum, F. Bosch, R. J. Chen, et al.
  • Journal Title: Phys. Rev. C Volume: 95 Issue: 1 Pages: 014610-014610
  • DOI: 10.1103/physrevc.95.014610
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-precision QEC values of super allowed 0+ -> 0+ b-emitters 46Cr, 50Fe, and 54Ni (2017)
  • Author(s): P. Zhang, X. Xu, P. Shuai, R.J. Chen, X.L. Yan, Y.H. Zhang, M. Wang, Yu.A. Litvinov, K. Blaum, H.S. Xu, et al.
  • Journal Title: Phys. Lett. B Volume: 767 Pages: 20-24
  • DOI: 10.1016/j.physletb.2017.01.039
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nuclear-matter radius studies from 58Ni(α,α) experiments at the GSI Experimental Storage Ring with the EXL facility (2017)
  • Author(s): J. C. Zamora, T. Aumann, S. Bagchi, S. Boenig, M. Csatlos, I. Dillmann, C. Dimopoulou, P. Egelhof, V. Eremin, T. Furuno, et al.
  • Journal Title: Phys. Rev. C Volume: 96 Issue: 3 Pages: 034617-034617
  • DOI: 10.1103/physrevc.96.034617
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Half-life measurement of short-lived 94mRu44+ using isochronous mass spectrometry (2017)
  • Author(s): Q. Zeng, M. Wang, X. H. Zhou, Y. H. Zhang, X. L. Tu, X. C. Chen, X. Xu, Yu. A. Litvinov, H. S. Xu, K. Blaum, et al.
  • Journal Title: Phys. Rev. C Volume: 96 Issue: 3 Pages: 031303-031303
  • DOI: 10.1103/physrevc.96.031303
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 稀少RIリングのためのプラスチックシンチレータを用いた位置検出器の開発 (2020)
  • Author(s): 濱川大貴
  • Organizer: 日本物理学会2020年秋季大会
• [Presentation] 稀少RIリングにおける周回周期の測定のためのデルタ線検出器の性能評価 (2020)
  • Author(s): 梶木大輔
  • Organizer: 日本物理学会2020年秋季大会
• [Presentation] New experimental plan and detector R&D at the Rare-RI Ring facility (2019)
  • Author(s): T. Yamaguchi
  • Organizer: China-Japan Collaboration Workshop on "Nuclear Mass and Life for Unraveling Mysteries of R-process”
  • Int'l Joint Research / Invited
• [Presentation] ILIMA status report and phase-0 program (2019)
  • Author(s): T. Yamaguchi
  • Organizer: Nuster Week 2019
  • Int'l Joint Research / Invited
• [Presentation] 極低温静電型イオン蓄積リングRICEを用いたN2O+の輻射振動冷却II (2019)
  • Author(s): 廣田彩音
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 稀少RIリングのためのファイバーシンチレーション検出器の開発 (2019)
  • Author(s): 稲田康人
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 稀少RIリングのための薄膜を利用した位置検出器の開発 (2019)
  • Author(s): 細井駿
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 極低温静電型イオン蓄積リングRICEによるN2O+の振動冷却測定 (2019)
  • Author(s): 廣田彩音
  • Organizer: 2019年原子衝突学会44回年会
• [Presentation] Status of RIKEN Ring (2019)
  • Author(s): T. Yamaguchi
  • Organizer: NucAR collaboration meeting
  • Int'l Joint Research / Invited
• [Presentation] Rare-RI Ring project in RIKEN and a proposal at CSRe (2018)
  • Author(s): T. Yamaguchi
  • Organizer: Symposium on Precision Physics Experiments with Stored Highly Charged Ions at Low Energies
  • Int'l Joint Research / Invited
• [Presentation] Precision mass spectrometry of stored exotic nuclei (2018)
  • Author(s): T. Yamaguchi
  • Organizer: 重力波マルチメッセンジャー研究会「重力波観測時代のrプロセスと不安定核」
  • Invited
• [Presentation] 稀少RIリングを用いたウラン核分裂片の質量測定実験のデータ解析 (2018)
  • Author(s): 大甕舜一朗
  • Organizer: 日本物理学会第73回年次大会（東京理科大学野田キャンパス）
• [Presentation] Storage-ring mass spectrometry of exotic nuclei (2017)
  • Author(s): T. Yamaguchi
  • Organizer: International symposium on RI beam physics in the 21st century: 10th anniversary of RIBF
  • Int'l Joint Research / Invited
• [Presentation] ILIMA project: isomeric beams, lifetimes and masses at the FAIR storage rings (2017)
  • Author(s): T. Yamaguchi
  • Organizer: 10th International Conference on Nuclear Physics at Storage Rings
  • Int'l Joint Research / Invited
• [Presentation] ILIMA status report (2017)
  • Author(s): T. Yamaguchi
  • Organizer: NUSTAR week 2017
  • Int'l Joint Research / Invited
• [Presentation] 稀少RIリングの質量測定の現状 (2017)
  • Author(s): 大甕舜一朗
  • Organizer: 日本物理学会2017年秋季大会（宇都宮大学峰キャンパス）
• [Presentation] Storage-ring mass spectrometry at GSI/FAIR (2017)
  • Author(s): 山口貴之
  • Organizer: 日本物理学会2017年秋季大会（宇都宮大学峰キャンパス）