Beta-decay spectroscopy of waiting-point nuclei in the third peak of element abundance pattern produced by r-process

• Project/Area Number: 26247044
• 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: Jeong SunChan 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, 客員教授 (00262105)
• 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) ; 宮武 宇也 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) ; 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) ; 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)
• Research Collaborator: WADA Michiharu ; SONODA Tetsu ; KIMURA Souta ; MUKAI Momo ; Kim Y. H. ; Huyse M. ; Kudryavtsev Yu. ; Duppen P. Van
• Project Period (FY): 2014-06-27 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥41,340,000 (Direct Cost: ¥31,800,000、Indirect Cost: ¥9,540,000); Fiscal Year 2016: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2015: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2014: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
• Keywords: 国際情報交換 / ベルギー / 元素合成 / アルゴンガスセル / レーザー共鳴イオン化

Outline of Final Research Achievements

In order to reveal the astrophysical environment for the formation of the 3rd peak in the solar r-abundance pattern produced by the r-process, we performed precise beta-decay spectroscopy of the nuclei around neutron magic number N=126. We developed the following three items to proceed with our research. (1) We developed a doughnut-shaped gas-cell and could increase the production yield by a factor of ten. (2)We installed a new dye laser and established laser resonance ionization schemes of the heavy elements with atomic number Z=73-78. (3)We developed highly efficient and low-background gas-counter for the lifetime measurement by detecting the beta-rays. As the result, we can successfully measure the lifetimes of 199,201Pt, 196,197,198,201Ir and 196Os. Moreover, we can evaluate the magnetic dipole moments and the change of the charge radii by using the in-gas-cell laser ionization spectroscopy technique successfully.

Research Products

• [Int'l Joint Research] Institute for basic science/Seoul National University(韓国)
• [Int'l Joint Research] GANIL(France)
• [Int'l Joint Research] KU Leuven(Belgium)
• [Int'l Joint Research] Katholieke Universiteit Leuven(ベルギー)
• [Int'l Joint Research] Institute for Basic Science/Seoul National University(韓国)
• [Int'l Joint Research] GANIL/Institut de Physique Nucleaire (IPN)(フランス)
• [Int'l Joint Research] Universita di Torino/Laboratori Nazionali di Legnaro(イタリア)
• [Journal Article] Nuclear spectroscopy of r-process nuclei around N=126 using KISS (2017)
  • Author(s): Y. Hirayama, Y. X. Watanabe, H. Miyatake, P. Schury, M. Wada, M. Oyaizu, Y. Kakiguchi, M. Mukai, S. Kimura, M. Ahmed, S. C. Jeong, J. Y. Moon, J. H. Park
  • Journal Title: IL NUOVO CIMENTO Volume: 39
  • 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] Development of the detector system for image-decay spectroscopy at the KEK Isotope Separation System (2016)
  • Author(s): S. Kimura, H. Ishiyama, H. Miyatake, Y. Hirayama, Y.X. Watanabe, H.S. Jung, M. Oyaizu, M. Mukai, S.C. Jeong, A. Ozawa
  • Journal Title: Nucl. Instrum. Methods B Volume: 376 Pages: 338-340
  • DOI: 10.1016/j.nimb.2016.01.041
  • Peer Reviewed / 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] 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
• [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
• [Presentation] Production of radioactive nuclei relevant to r-process by multinucleon transfer reactions for KISS (2017)
  • Author(s): Y.X. Watanabe
  • 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: 原子力機構・先端基礎研究センター(茨城県、東海村)
  • Year and Date: 2017-03-05
• [Presentation] Present status of KISS (2017)
  • Author(s): Y. Hirayama
  • 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: 原子力機構・先端基礎研究センター(茨城県、東海村)
  • Year and Date: 2017-03-05
• [Presentation] Development of low-background gas-counter for the beta spectroscopy at KISS (2017)
  • Author(s): M. Mukai
  • 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: 原子力機構・先端基礎研究センター(茨城県、東海村)
  • Year and Date: 2017-03-05
• [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: 短寿命RIを用いた核分光と核物性研究III
  • Place of Presentation: 大阪. 京大原子炉(大阪府、熊取町)
  • Year and Date: 2016-12-20
• [Presentation] Production of N = 126 nuclei and beyond using multinucleon transfer reactions (2016)
  • Author(s): Y.X. Watanabe
  • Organizer: First Tsukuba-CCS-RIKEN joint workshop on microscopic theories of nuclear structure and dynamics
  • Place of Presentation: 理化学研究所(埼玉県、和光市)
  • Year and Date: 2016-12-12
  • Int'l Joint Research / Invited
• [Presentation] Production of N = 126 nuclei and beyond using deep inelastic transfer reactions (2016)
  • Author(s): Y.X. Watanabe
  • Organizer: Sixth International conference on Fission and Properties of Neutron-rich Nuclei
  • Place of Presentation: Sanibel, Florida(USA)
  • Year and Date: 2016-11-06
  • Int'l Joint Research / Invited
• [Presentation] Recent spectroscopic activities using multi-nucleon transfer reaction products at KISS (2016)
  • Author(s): Y. Hirayama
  • Organizer: the La3net laser ion source and RESIST 2016 Workshop
  • Place of Presentation: Paris(France)
  • Year and Date: 2016-10-24
  • Int'l Joint Research / Invited
• [Presentation] Spectroscopy of multi-nucleon transfer reaction products using KISS (2016)
  • Author(s): Y. Hirayama
  • Organizer: The RIBF Users Meeting 2016
  • Place of Presentation: 理化学研究所(埼玉県、和光市)
  • Year and Date: 2016-09-08
  • Int'l Joint Research / Invited
• [Presentation] KISS status (2016)
  • Author(s): Y. Hirayama
  • Organizer: 2016 SSRI-PNS collaboration meeting
  • Place of Presentation: 理化学研究所(埼玉県、和光市)
  • Year and Date: 2016-09-02
  • Int'l Joint Research / Invited
• [Presentation] Nuclear spectroscopy of r-process nuclei around N=126 using KISS (2016)
  • Author(s): Y. Hirayama
  • Organizer: The Second Sicily-East Asia Workshop on Low Energy Nuclear Physics(SEA2016)
  • Place of Presentation: 理化学研究所(埼玉県、和光市)
  • Year and Date: 2016-06-26
  • Int'l Joint Research / Invited
• [Presentation] Production of radioactive nuclei relevant to r-process by multinucleon transfer reaction for KISS (2016)
  • Author(s): Y. Watanabe
  • Organizer: 14th International symposium on Nuclei in the Cosmos XIV
  • Place of Presentation: Toki Messe(新潟県、新潟市)
  • Year and Date: 2016-06-19
  • Int'l Joint Research
• [Presentation] Spectroscopy of multi-nucleon transfer reaction products using KISS (2016)
  • Author(s): Y. Hirayama
  • Organizer: The 12th International Conference on Stopping and Manipulation of Ions and related topics (SMI-2016)
  • Place of Presentation: Lanzhou(China)
  • Year and Date: 2016-06-08
  • Int'l Joint Research / Invited
• [Presentation] Experimental study of multinucleon transfer reactions of 136Xe + 198Pt for KISS project (2016)
  • Author(s): Y.X. Watanabe
  • Organizer: Korean Physical Society 2016 Spring Meeting
  • Place of Presentation: Daejeon Convention Center(Daejeon, Korea)
  • Year and Date: 2016-04-20
  • Invited
• [Presentation] Experimental study of multinucleon transfer reactions of 136Xe + 198Pt for KISS project (2015)
  • Author(s): 渡辺 裕
  • Organizer: The 9th Japan-China Joint Nuclear Physics Symposium (JCNP2015)
  • Place of Presentation: 大阪大学吹田キャンパス(大阪府吹田市)
  • Year and Date: 2015-11-07
• [Presentation] KISSを用いた核分光実験 (2015)
  • Author(s): 平山 賀一
  • Organizer: 短寿命RIを用いた核分光と核物性研究II
  • Place of Presentation: 京都大学原子炉実験所(大阪府熊取町)
  • Year and Date: 2015-11-04
• [Presentation] 多核子移行反応によるN=126中性子過剰核の生成に関する実験的研究 (2015)
  • Author(s): 渡辺 裕
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 大阪市立大学杉本キャンパス(大阪府大阪市)
  • Year and Date: 2015-09-25
• [Presentation] Beta-decay spectroscopy of r-process nuclei around N = 126 (2015)
  • Author(s): 宮武 宇也
  • Organizer: OMEG2015, The 12th International Symposium on Origin of Matter and Evolution of Galaxies
  • Place of Presentation: Beijing, China
  • Year and Date: 2015-06-24
  • 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): 平山 賀一
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS2015)
  • Place of Presentation: Grand Rapids, Michigan, in the United States
  • Year and Date: 2015-05-11
  • 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): 向井 もも
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS2015)
  • Place of Presentation: Grand Rapids, Michigan, in the United States
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] Development of the detector system for image-decay spectroscopy at the KEK Isotope Separation System (2015)
  • Author(s): 木村 創大
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS2015)
  • Place of Presentation: Grand Rapids, Michigan, in the United States
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] Measurements of multi-nucleon transfer reactions of 136Xe + 198Pt for production of exotic nuclei (2015)
  • Author(s): 渡辺 裕
  • Organizer: International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS2015)
  • Place of Presentation: Grand Rapids, Michigan, in the United States
  • Year and Date: 2015-05-11
  • Int'l Joint Research
• [Presentation] On-line experimental results of argon gas cell based laser ion source (KEK Isotope Separation System) (2015)
  • Author(s): 平山 賀一
  • Organizer: EMIS2015
  • Place of Presentation: Grand Rapids, Michigan, US
  • Year and Date: 2015-05-10 – 2015-05-15
• [Presentation] Measurements of multinucleon transfer reactions of 136Xe + 198Pt for production of exotic nuclei (2015)
  • Author(s): 渡辺 裕
  • Organizer: EMIS2015
  • Place of Presentation: Grand Rapids, Michigan, US
  • Year and Date: 2015-05-10 – 2015-05-15
• [Presentation] Search for efficient laser resonance ionization schemes for Ta and W using a new reference-cell in KISS (2015)
  • Author(s): 向井 もも
  • Organizer: EMIS2015
  • Place of Presentation: Grand Rapids, Michigan, US
  • Year and Date: 2015-05-10 – 2015-05-15
• [Presentation] Development of the detector system for β-decay spectroscopy at the KEK isotope separation system (2015)
  • Author(s): 木村 創大
  • Organizer: EMIS2015
  • Place of Presentation: Grand Rapids, Michigan, US
  • Year and Date: 2015-05-10 – 2015-05-15
• [Presentation] KISS to explore neutron-rich nuclei around the last r-process bottleneck (2014)
  • Author(s): 平山 賀一
  • Organizer: Recent progress on r-process and nucleosynthesis
  • Place of Presentation: 理化学研究所
  • Year and Date: 2014-11-25
  • Invited
• [Remarks] KEK 和光原子核科学センター(Wako Nuclear Science Center)
  • URL: http://research.kek.jp/group/wnsc/
• [Remarks] KEK 短寿命核グループのホームページ
  • URL: http://research.kek.jp/group/kekrnb/