Pioneering mass measurement research of r-process nuclei in the blank spot region

• Project/Area Number: 15H02096
• 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: High Energy Accelerator Research Organization
• Principal Investigator: Miyatake Hiroari 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (50190799)
• Co-Investigator(Kenkyū-buntansha): 平山 賀一 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (30391733) ; 渡邉 裕 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (50353363) ; 石山 博恒 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (50321534)
• Co-Investigator(Renkei-kenkyūsha): Wada Michiharu 高エネルギー加速器研究機構, 素粒子原子核研究所・和光原子核科学センター, 教授 (50240560) ; Schury Peter 高エネルギー加速器研究機構, 素粒子原子核研究所・和光原子核科学センター, 助教 (30462724) ; Ito Yuta 理化学研究所, 仁科加速器研究センター, 基礎科学特別研究員 (30711501)
• Research Collaborator: Mukai Momo 筑波大学, 大学院生 ; Kimura Sota 筑波大学, 大学院生 ; Moon Jun-young 韓国IBS, researcher ; Park Jinhyung 韓国IBS, researcher
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥41,990,000 (Direct Cost: ¥32,300,000、Indirect Cost: ¥9,690,000); Fiscal Year 2017: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2016: ¥23,790,000 (Direct Cost: ¥18,300,000、Indirect Cost: ¥5,490,000); Fiscal Year 2015: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
• Keywords: 多重反射型飛行時間測定式質量分光器 / レーザー共鳴イオン化 / 速い中性子捕獲過程 / ブランクスポット / 元素選択型質量分離器 / 原子核質量測定 / 不安定核物理 / 天体核物理 / 多重反射型飛行時間測定式質量測定器 / 実験核物理 / 早い中性子捕獲過程 / 短寿命核ビーム

Outline of Final Research Achievements

Heavy elements like gold and platinum are generated in universe through successive decays of neutron-rich nuclei, which are synthesized in the rapid neutron-capture process (r-process). We can investigate an astrophysical condition of the r-process based on the masses and lifetimes of these neutron-rich nuclei.
In this pioneering research, we have been preparing mass measurements of neutron-rich heavy nuclei, which were produced artificially by the nuclear reactions and separated from many radioactive nuclei simultaneously produced. We have succeeded to construct a multi-reflection time-of-flight mass spectrograph (MRTOF-MS), which has been connected to the KEK isotope separation system (KISS). This experimental setup will make it possible to perform precise mass measurement of neutron-rich radioactive nuclei, being produced and separated using KISS.

Research Products

• [Int'l Joint Research] IBS(韓国)
• [Int'l Joint Research] Univ. of Surrey/Univ. of Brighton(英国)
• [Int'l Joint Research] Argonne Nat. Lab.(米国)
• [Int'l Joint Research] Australian Nat. Univ.(オーストラリア)
• [Int'l Joint Research] GSI(ドイツ)
• [Int'l Joint Research]
• [Int'l Joint Research] 基礎科学研究院(Institute for Basic Science)( 韓国)
• [Int'l Joint Research] KU Leuven University(ベルギー)
• [Int'l Joint Research] 基礎科学研究院(Institute for Basic Science)(韓国)
• [Int'l Joint Research] KU Leuven university(ベルギー)
• [Journal Article] First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph (2018)
  • Author(s): Ito Y.、Schury P.、Wada M.、Arai F.、Haba H.、Hirayama Y.、Ishizawa S.、Kaji D.、Kimura S.、Koura H.、MacCormick M.、Miyatake H.、Moon J.?Y.、Morimoto K.、Morita K.、Mukai M.、Murray I.、Niwase T.、Okada K.、Ozawa A.、Rosenbusch M.、Takamine A.、Tanaka T.、Watanabe Y.?X.、Wollnik H.、Yamaki S.
  • Journal Title: Physical Review Letters Volume: 120 Issue: 15 Pages: 152501-152501
  • DOI: 10.1103/physrevlett.120.152501
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-efficiency and low-background multi-segmented proportional gas counter for β-decay spectroscopy (2018)
  • Author(s): Mukai M.、Hirayama Y.、Watanabe Y.X.、Schury P.、Jung H.S.、Ahmed M.、Haba H.、Ishiyama H.、Jeong S.C.、Kakiguchi Y.、Kimura S.、Moon J.Y.、Oyaizu M.、Ozawa A.、Park J.H.、Ueno H.、Wada M.、Miyatake H.
  • Journal Title: Nuclear Instruments and Methods in Physics Research, Section A Volume: 884 Pages: 1-10
  • DOI: 10.1016/j.nima.2017.12.013
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Doughnut-shaped gas cell for KEK Isotope Separation System (2017)
  • Author(s): Hirayama Y.、Watanabe Y.X.、Mukai M.、Oyaizu M.、Ahmed M.、Ishiyama H.、Jeong S.C.、Kakiguchi Y.、Kimura S.、Moon J.Y.、Park J.H.、Schury P.、Wada M.、Miyatake H.
  • Journal Title: Nuclear Instruments and Methods in Physics Research, Section B Volume: 412 Pages: 11-18
  • DOI: 10.1016/j.nimb.2017.08.037
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ionization cross section, pressure shift and isotope shift measurements of osmium (2017)
  • Author(s): Hirayama Yoshikazu、Mukai Momo、Watanabe Yutaka、Oyaizu Michihiro、Ahmed Murad、Kakiguchi Yutaka、Kimura Sota、Miyatake Hiroari、Schury Peter、Wada Michiharu、Jeong Sun-Chan
  • Journal Title: nal of Physics B: Atomic, Molecular and Optical Physics Volume: 50 Issue: 21 Pages: 215203-215203
  • DOI: 10.1088/1361-6455/aa8b50
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observation of doubly-charged ions of francium isotopes extracted from a gas cell (2017)
  • Author(s): Schury P.、Wada M.、Ito Y.、Kaji D.、Haba H.、Hirayama Y.、Kimura S.、Koura H.、MacCormick M.、Miyatake H.、Moon J.Y.、Morimoto K.、Morita K.、Murray I.、Ozawa A.、Rosenbusch M.、Reponen M.、Takamine A.、Tanaka T.、Watanabe Y.X.、Wollnik H.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 407 Pages: 160-165
  • DOI: 10.1016/j.nimb.2017.06.014
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] In-gas-cell laser spectroscopy of the magnetic dipole moment of the N~126 isotope 199Pt (2017)
  • Author(s): Y. Hirayama, M. Mukai, Y. X. Watanabe, M. Ahmed, S. C. Jeong, H. S. Jung, Y. Kakiguchi, S. Kanaya, S. Kimura, J. Y. Moon, T. Nakatsukasa, M. Oyaizu, J. H. Park, P. Schury, A. Taniguchi, M. Wada, K. Washiyama, H. Watanabe, and H. Miyatake
  • Journal Title: Physical Review C Volume: 96 Issue: 1 Pages: 014307-014307
  • DOI: 10.1103/physrevc.96.014307
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] First online multi reflection time-of-flight mass measurements of isobaric chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy (2017)
  • Author(s): P.Schury, M.Wada, Y.Ito, D.Kaji, F.Arai, M.MacCormick, I.Murray, H.Haba, S.Jeong, S.Kimura, H.Koura, H.Miyatake, K.Morimoto, K.Morita, A.Ozawa, M. Reponen, P-A.Soederstroem, A.Takamine, T.Tanaka, H.Wollnik
  • Journal Title: Physical Review C Volume: 95 Issue: 1 Pages: 011305-011305
  • DOI: 10.1103/physrevc.95.011305
  • NAID: 120006502093
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Nuclear spectroscopy of r-process nuclei around N = 126 using KISS (2016)
  • Author(s): Hirayama, Y., Watanabe, Y.X., Miyatake, H., Schury, P., Wada, M., Oyaizu, M., Kakiguchi, Y., Mukai, M., Kimura, S., Ahmed, M., Jeong, S.C., Moon, J.Y., Park, J.H.
  • Journal Title: Nuovo Cimento della Societa Italiana di Fisica C Volume: 39 Pages: 359-359
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On-line experimental results of an argon gas cell-based laser ion source (KEK Isotope Separation System) (2016)
  • Author(s): Y. Hirayama, Y.X. Watanabe, N. Imai, H. Ishiyama, S.C. Jeong, H.S. Jung, H. Miyatake, M. Oyaizu, S. Kimura, M. Mukai, Y.H. Kim, T. Sonoda, M. Wada, M. Huyse, Yu. Kudryavtsev, P. Van Duppen
  • Journal Title: Nucl. Instrum. Methods B Volume: 376 Pages: 52-56
  • DOI: 10.1016/j.nimb.2016.03.031
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Search for efficient laser resonance ionization schemes of tantalum using a newly developed time-of-flight mass-spectrometer in KISS (2016)
  • Author(s): M. Mukai, Y. Hirayama, H. Ishiyama, H.S. Jung, H. Miyatake, M. Oyaizu, Y.X. Watanabe, S. Kimura, A. Ozawa, S.C. Jeong, T. Sonoda
  • Journal Title: Nucl. Instrum. Methods B Volume: 376 Pages: 73-76
  • DOI: 10.1016/j.nimb.2016.02.017
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Status of the low-energy super-heavy element facility at RIKEN (2016)
  • Author(s): Schury, P., Wada, M., Ito, Y., Arai, F., Kaji, D., Kimura, S., Morimoto, K., Haba, H., Jeong, S., Koura, H., Miyatake, H., Morita, K., Reponen, M., Ozawa, A., Sonoda, T., Takamine, A., Wollnik, H.
  • Journal Title: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume: 印刷中 Pages: 425-428
  • DOI: 10.1016/j.nimb.2016.02.061
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Beta-decay spectroscopy of r-process nuclei around N = 126 (2016)
  • Author(s): HIrayama, Y., Miyatake, H., Watanabe, Y.X., Imai, N., Ishiyama, H., Jeong, S.C., Jung, H.S., Oyaizu, M., Mukai, M., Kimura, S., Sonoda, T., Wada, M., Kim, Y.H., Huyse, M., Kudryavtsev, Yu., Van Duppen, P.
  • Journal Title: European Physical Journal Volume: 109 Pages: 08001-08001
  • DOI: 10.1051/epjconf/201610908001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of the detector system for β-decay spectroscopy at the KEK Isotope Separation System (2016)
  • Author(s): Kimura, S., Ishiyama, H., Miyatake, H., Hirayama, Y., Watanabe, Y.X., Jung, H.S., Oyaizu, M., Mukai, M., Jeong, S.C., Ozawa, A.
  • Journal Title: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Pathway for the production of neutron-rich isotopes around the N=126 shell closure (2015)
  • Author(s): Watanabe, Y.X.,Kim, Y.H., Jeong, S.C., Hirayama, Y., Imai, N., Ishiyama, H., Jung, H.S., Miyatake, H., Choi, S., Song, J.S., Clement, E., De France, G., Navin, A., Rejmund, M., Schmitt, C., Pollarolo, G., Corradi, L., Fioretto, E., Montanari, D., Niikura, Mi, Suzuki, D., Nishibata, H., Takatsu, J.
  • Journal Title: Physical Review Letters Volume: 115 Issue: 17 Pages: 172503-172503
  • DOI: 10.1103/physrevlett.115.172503
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Laser ion source for multi-nucleon transfer reaction products (2015)
  • Author(s): Hirayama, Y., Watanabe, Y.X., Imai, N., (...), Kudryavtsev, Yu., Van Duppen, P.
  • Journal Title: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume: 353 Pages: 4-15
  • DOI: 10.1016/j.nimb.2015.04.001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 重元素の網羅的質量測定の可能性と応用 (2017)
  • Author(s): 和田道治
  • Organizer: 日本物理学会 春の年会
  • Place of Presentation: 大阪大学（大阪府・豊中市）
  • Year and Date: 2017-03-17
  • Invited
• [Presentation] Production of radioactive nuclei relevant to r-process by multinucleon transfer reactions for KISS (2017)
  • Author(s): 渡邉裕
  • Organizer: 「第9 回停止・低速RI ビームを用いた核分光研究会」 & 「2017 超重元素の科学研究会」 合同研究会
  • Place of Presentation: 日本原子力研究開発機構（茨城県・東海村）
  • Year and Date: 2017-03-05
• [Presentation] Present status of KISS (2017)
  • Author(s): 平山賀一
  • Organizer: 「第9 回停止・低速RI ビームを用いた核分光研究会」 & 「2017 超重元素の科学研究会」 合同研究会
  • Place of Presentation: 日本原子力研究開発機構（茨城県・東海村）
  • Year and Date: 2017-03-05
• [Presentation] Precision mass measurements of trans-uranium nuclei with MRTOF at RIKEN (2017)
  • Author(s): 伊藤由太
  • Organizer: 「第9 回停止・低速RI ビームを用いた核分光研究会」 & 「2017 超重元素の科学研究会」 合同研究会
  • Place of Presentation: 日本原子力研究開発機構（茨城県・東海村）
  • Year and Date: 2017-03-05
• [Presentation] Observation of doubly-charged ions of Pb through Pu extracted from cryogenic gas cell and mass analyzed by MRTOF-MS (2017)
  • Author(s): Peter Schury
  • Organizer: 「第9 回停止・低速RI ビームを用いた核分光研究会」 & 「2017 超重元素の科学研究会」 合同研究会
  • Place of Presentation: 日本原子力研究開発機構（茨城県・東海村）
  • Year and Date: 2017-03-05
• [Presentation] Recent progress of the KISS project at KEK-WNSC (2017)
  • Author(s): H. Miyatake
  • Organizer: China-Japan collaboration workshop on “Nuclear mass and life for unravelling mysteries of r-process”, 6/26-28, Tsukuba Univ., Tsukuba
  • Invited
• [Presentation] Present status of the KISS project (2017)
  • Author(s): H. Miyatake
  • Organizer: OMEG 2017, International Symposium on Origin of Matter and Evolution of Galaxies, 6/27-30, Daejeong, Korea
  • Int'l Joint Research
• [Presentation] Present status of the KISS project (2017)
  • Author(s): H. Miyatake
  • Organizer: International Workshop on “Physics Opportunities using CAGRA and RCNP tracking Ge detector” (CAGRA17), 10/10-12, RCNP, Osaka
  • Int'l Joint Research / Invited
• [Presentation] Recent KISS activities and future’s plan (2017)
  • Author(s): H. Miyatake
  • Organizer: Workshop for Einsteinium Campaign, 11/7-8, JAEA, Tokai
  • Int'l Joint Research / Invited
• [Presentation] Nuclear production by multinucleon transfer reactions with neutron-rich heavy ion beams (2017)
  • Author(s): Y.X. Watanabe
  • Organizer: Workshop for Einsteinium Campaign, 11/7-8, JAEA, Tokai
  • Int'l Joint Research / Invited
• [Presentation] KISS、超微細構造測定と質量測定の現状 (2017)
  • Author(s): 宮武宇也
  • Organizer: 平成29年度KUR専門研究会 「短寿命RIを用いた核分光と核物性研究」, 12/20-21, 京大原子炉実験所
• [Presentation] Present status of the KISS project (2017)
  • Author(s): H. Miyatake
  • Organizer: Impact of Exotic Nuclear Structure on Explosive Nucleosynthesis, 11/23-24, Beihang Univ., China
  • Int'l Joint Research / Invited
• [Presentation] Production of neutron-rich nuclei by multinucleon transfer reactions at KISS Project (2017)
  • Author(s): Y. X. Watanabe
  • Organizer: 3rd International Symposium on Super-Heavy Elements (SHE2017), 9/10-14, Kazimierz Dolny, Poland
  • Int'l Joint Research / Invited
• [Presentation] Production of N = 126 Nuclei and Beyond Using Multinucleon Transfer Reactions for KISS Project (2017)
  • Author(s): Y.X. Watanabe
  • Organizer: ARIS2017, 5/28-6/2, Keystone, United States
  • Int'l Joint Research
• [Presentation] KISS I : 199Ptのレーザー共鳴イオン化核分光 (2017)
  • Author(s): 平山賀一
  • Organizer: 日本物理学会、9/12-15, 宇都宮大学
• [Presentation] Nuclear spectroscopy of r-process nuclei around N=126 by using KISS (2017)
  • Author(s): Y. Hirayama
  • Organizer: International symposium of RI beam physics in the 21th century: 10th anniversary of RIBF, 12/4-5, Riken
  • Int'l Joint Research / Invited
• [Presentation] Nuclear spectroscopy of r-process nuclei around N=126 by using KISS (2017)
  • Author(s): Y. Hirayama
  • Organizer: KEK-TRIUMF Scientific Symposium, TRIUMF
  • Invited
• [Presentation] KISS,SLOWRI施設での低エネルギー核分光研究 (2016)
  • Author(s): 宮武宇也
  • Organizer: 平成28年度KUR専門研究会「短寿命RIを用いた核分光と核物性研究」
  • Place of Presentation: 京都大学原子炉実験所（大阪府・泉南郡熊取町）
  • Year and Date: 2016-12-20
• [Presentation] Nuclear Physics with Slow and Stopped Beams at RIBF (2016)
  • Author(s): Schury Peter
  • Organizer: Korean physical society fall meeting
  • Place of Presentation: Gwangju, Korea
  • Year and Date: 2016-10-19
  • Invited
• [Presentation] Mass Measurements of r-Process Nuclei at KISS and SLOWRI (2016)
  • Author(s): Schury Peter
  • Organizer: 14th International Symposium on Nuclei in the Cosmos XIV
  • Place of Presentation: 朱鷺メッセ( 新潟県・新潟市）
  • Year and Date: 2016-06-19
  • Int'l Joint Research
• [Presentation] Experimental study of multinucleon transfer reactions of 136Xe + 198Pt for KISS project (2016)
  • Author(s): Y.X. Watanabe
  • Organizer: 8th Japan-Italy Symposium
  • Place of Presentation: 理化学研究所(埼玉県、和光市）
  • Year and Date: 2016-03-07
  • Int'l Joint Research
• [Presentation] Experimental study of multi-nucleon transfer reactions of 136Xe + 198Pt for KISS project (2015)
  • Author(s): Y.X. Watanabe
  • Organizer: The 9th Japan-China Joint Nuclear Physics Symposium (JCNP 2015)
  • Place of Presentation: 大阪大学銀杏会館（大阪府、吹田市）
  • Year and Date: 2015-11-07
  • Int'l Joint Research
• [Presentation] Beta-decay spectroscopy of r-process nuclei around N = 126 (2015)
  • Author(s): Y. Hirayama
  • Organizer: Origin of Matter and Evolution of Galaxies (OMEG2015)
  • Place of Presentation: Beijin, China
  • Year and Date: 2015-06-24
  • Int'l Joint Research
• [Presentation] Search for efficient laser resonance ionization schemes of tantalum using a newly developed time-of-flight mass-spectrometer in KISS (2015)
  • Author(s): M. Mukai
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS)
  • Place of Presentation: Michigan, USA
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] Development of the detector system for β-decay spectroscopy at the KEK Isotope Separation System (2015)
  • Author(s): S. Kimura
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS)
  • Place of Presentation: Michigan, USA
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] Status of the low-energy super-heavy element facility at RIKEN (2015)
  • Author(s): Schury, Peter
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS)
  • Place of Presentation: Michigan, USA
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] On-line experimental results of an argon gas cell-based laser ion source (KEK Isotope Separation System) (2015)
  • Author(s): Y. Hirayama
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS)
  • Place of Presentation: Michigan, USA
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Remarks] KEK 和光原子核科学センター
  • URL: http://research.kek.jp/group/wnsc/
• [Remarks] 和光原子核科学センター
  • URL: http://research.kek.jp/group/wnsc/
• [Remarks] IGLIS-net
  • URL: http://research.kek.jp/group/kekrnb/iglis-net/
• [Remarks] KEK RNB Group
  • URL: http://research.kek.jp/group/kekrnb/