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Relation between nuclear shape and beta-decay half life of neutron-rich Zr isotopes

Research Project

Project/Area Number 26800117
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research (2015-2016)
Tohoku University (2014)

Principal Investigator

Sumikama Toshiyuki  国立研究開発法人理化学研究所, 仁科加速器研究センター, チームリーダー (20392003)

Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsβ崩壊 / 重元素合成
Outline of Final Research Achievements

The origin of elements heavier than iron in the solar system is considered to the nucleosynthesis in an environment where many neutrons exist such as a supernova explosion. In this process, very neutron-rich nuclei are produced via continuous neutron-capture reactions and beta decays. In this study, the beta decays were measured for the neutron-rich nuclei with the proton number 40 (Zr) and neighboring. The shape of nuclei, which is related to the beta decay half lives, was investigated. The deformation parameters for the Zr isotopes were successfully determined from the life time of the excited state, and the maximum deformation at the neutron number 64 was determined. New rotational bands in Mo isotopes were also observed, which are related to the detail of the deformed shape.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (49 results)

All 2017 2016 2015 2014 Other

All Int'l Joint Research (12 results) Journal Article (25 results) (of which Int'l Joint Research: 19 results,  Peer Reviewed: 25 results,  Open Access: 12 results,  Acknowledgement Compliant: 3 results) Presentation (12 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Int'l Joint Research] University of Brighton/University of Surrey/University of York(英国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] University de Strasbourg/University Grenoble-Alpes/ILL, Grenoble(フランス)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] GSI/Technische Universitat Darmstadt/Technische Universitat Muenchen(ドイツ)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Universidad Autonoma de Madrid/Instituto de Estructura de la Materia/University of Valencia(スペイン)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Seoul National University/Chung-Ang University/Hoseo University(韓国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] University of Brighton/University of Surrey/University of York(英国)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] University de Strasbourg/University Grenoble-Alpes/ILL, Grenoble(フランス)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] GSI/Technische Universitat Darmstadt/Technische Universi;at Muenchen(ドイツ)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] Universidad Autonoma de Madrid/Instituto de Estructura de la Materia/University of Valencia(スペイン)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] Seoul National University/Chung-Ang University/Hoseo University(韓国)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2015 Research-status Report
  • [Journal Article] The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd2017

    • Author(s)
      P. Davies, …, S. Nishimura et al.
    • Journal Title

      Physics Letters B

      Volume: 767 Pages: 474-479

    • DOI

      10.1016/j.physletb.2017.02.013

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Type II shell evolution in A=70 isobars from the N >= 40 island of inversion2017

    • Author(s)
      A.I. Morales, H. Baba, T. Isobe, et al.
    • Journal Title

      Physics Letters B

      Volume: 765 Pages: 328-333

    • DOI

      10.1016/j.physletb.2016.12.025

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] beta-Decay Half-Lives of Neutron-Rich Cs-55 to Ho-67: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation2017

    • Author(s)
      J. Wu, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review Letters

      Volume: 118 Issue: 7 Pages: 072701-072701

    • DOI

      10.1103/physrevlett.118.072701

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] μs isomers of Nd-158,Nd-1602016

    • Author(s)
      E. Ideguchi, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review C

      Volume: 94 Issue: 6 Pages: 064322-064322

    • DOI

      10.1103/physrevc.94.064322

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First observation of γ rays emitted from excited states south-east of 132Sn: The π g-9/2 x νf7/2 multiplet of 132In832016

    • Author(s)
      A. Jungclaus, ..., S. Nishimura et al.
    • Journal Title

      Physical Review C

      Volume: 93 Issue: 4 Pages: 041301-041301

    • DOI

      10.1103/physrevc.93.041301

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] beta decay of semi-magic Cd-130: Revision and extension of the level scheme of In-1302016

    • Author(s)
      A. Jungclaus, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review C

      Volume: 94 Issue: 2 Pages: 024303-024303

    • DOI

      10.1103/physrevc.94.024303

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Low-lying excitations in 72Ni2016

    • Author(s)
      A.I. Morales, H. Baba, T. Isobe, et al.
    • Journal Title

      Physical Review C

      Volume: 93 Issue: 3 Pages: 034328-034328

    • DOI

      10.1103/physrevc.93.034328

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] K-mixing in the doubly mid-shell nuclide Dy-170 and the role of vibrational degeneracy2016

    • Author(s)
      P.A. Soderstrom, H. Baba, T. Isobe, et al.
    • Journal Title

      Physics Letters B

      Volume: 762 Pages: 404-408

    • DOI

      10.1016/j.physletb.2016.09.058

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Proton-hole and core-excited states in the semi-magic nucleus In-131(82)2016

    • Author(s)
      J. Taprogge, H. Baba, T. Isobe, et al.
    • Journal Title

      European Physical Journal A

      Volume: 52 Issue: 11 Pages: 347-347

    • DOI

      10.1140/epja/i2016-16347-y

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Long-lived K isomer and enhanced gamma vibration in the neutron-rich nucleus Dy-172: Collectivity beyond double midshell2016

    • Author(s)
      H. Watanabe, H. Baba, T. Isobe, et al.
    • Journal Title

      Physics Letters B

      Volume: 760 Pages: 641-646

    • DOI

      10.1016/j.physletb.2016.07.057

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer2016

    • Author(s)
      Z. Patel, Zs. Podolyak, P.M. Walker, P.H. Regan, P.-A. Soderstrom, H. Watanabe, E. Ideguchi, G.S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z.Y. Xu, et al.
    • Journal Title

      Physics Letters B

      Volume: 753 Pages: 182-186

    • DOI

      10.1016/j.physletb.2015.12.026

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New isomer found in 140_51Sb89: sphericity and shell evolution between N=82 and N=902016

    • Author(s)
      R. Lozeva, H. Naidja, F. Nowacki, J. Dudek, A. Odahara, C.-B. Moon, S. Nishimura, P. Doornenbal, J.-M. Daugas, P.-A. Soderstrom, T. Sumikama, G. Lorusso, J. Wu, Z.Y. Xu, et al.
    • Journal Title

      Physical Review C

      Volume: 93 Issue: 1 Pages: 014316-014316

    • DOI

      10.1103/physrevc.93.014316

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Lifetime measurements of the first 2+ states in 104, 106Zr: Evolution of ground-state deformations2015

    • Author(s)
      F. Browne, A.M. Bruce, T. Sumikama, I. Nishizuka, S. Nishimura, P. Doornenbal, G. Lorusso, P.-A. Soderstrom, H. Watanabe, R. Daido, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z.Y .Xu, A. Yagi, et al.
    • Journal Title

      Physics Letters B

      Volume: 750 Pages: 448-452

    • DOI

      10.1016/j.physletb.2015.09.043

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] β decay of 129Cd and excited states in 129In2015

    • Author(s)
      J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G.S. Simpson, P.-A. Soderstrom, T. Sumikama, Z.Y. Xu, et al.
    • Journal Title

      Physical Review C

      Volume: 91 Issue: 5 Pages: 054324-054324

    • DOI

      10.1103/physrevc.91.054324

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process2015

    • Author(s)
      G. Lorusso, S. Nishimura, Z.Y. Xu, A. Jungclaus, Y. Shimizu, G.S. Simpson, P.-A. Soderstrom, H. Watanabe, F. Browne, P. Doornenbal, G. Gey, H.S. Jung, B. Meyer, T. Sumikama, J. Taprogge, Zs. Vajta, J. Wu, et al.
    • Journal Title

      Physical Review Letters

      Volume: 114 Issue: 19 Pages: 192501-192501

    • DOI

      10.1103/physrevlett.114.192501

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Two-hole structure outside 78Ni: Existence of a μs isomer of 76Co and β decay into 76Ni2015

    • Author(s)
      P.-A. Soderstrom, S. Nishimura, Z.Y. Xu, K. Sieja, V. Werner, P. Doornenbal, G. Lorusso, F. Browne, G. Gey, H.S. Jung, T. Sumikama, J. Taprogge, Zs. Vajta, H. Watanabe, J. Wu, et al.
    • Journal Title

      Physical Review C

      Volume: 92 Issue: 5 Pages: 051305-051305

    • DOI

      10.1103/physrevc.92.051305

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New decay scheme of the 136_51Sb85 6- isomer2015

    • Author(s)
      R. Lozeva, A. Odahara, C.-B. Moon, S. Nishimura, P. Doornenbal, H. Naidja, F. Nowacki, P.-A. Soderstrom, T. Sumikama, G. Lorusso, J. Wu, Z.Y. Xu, et al.
    • Journal Title

      Physical Review C

      Volume: 92 Issue: 2 Pages: 024304-024304

    • DOI

      10.1103/physrevc.92.024304

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] β-delayed γ-ray spectroscopy of non-yrast states in 138Te near the neutron drip line2015

    • Author(s)
      P. Lee, C.-B. Moon, C.S. Lee, A. Odahara, R. Lozeva, A. Yagi, S. Nishimura, P. Doornenbal, G. Lorusso, P.-A. Soderstrom, T. Sumikama, H. Watanabe, et al.
    • Journal Title

      Physical Review C

      Volume: 92 Issue: 4 Pages: 044320-044320

    • DOI

      10.1103/physrevc.92.044320

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Decay properties of 68, 69, 70Mn: Probing collectivity up to N = 44 in Fe isotopic chain2015

    • Author(s)
      G. Benzoni, A.I. Morales, H. Watanabe, S. Nishimura, L. Coraggio, N. Itaco, A. Gargano, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Soderstrom, T. Sumikama, J. Wu, Z.Y. Xu, et al.
    • Journal Title

      Physics Letters B

      Volume: 751 Pages: 107-112

    • DOI

      10.1016/j.physletb.2015.10.025

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] β-Decay Half-Lives of 76, 77Co, 79, 80Ni and 81Cu Experimental Indication of a Doubly Magic 78Ni2014

    • Author(s)
      Z.Y. Xu, S. Nishimura, G. Lorusso, F. Browne, P. Doornenbal, G. Gey, H.-S. Jung, Z. Li, M. Niikura, P.-A. Soderstrom, T. Sumikama, J. Taprogge, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, H. Baba, S. Franchoo, H. Nishibata 他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 3 Pages: 032505-032505

    • DOI

      10.1103/physrevlett.113.032505

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Monopole-Driven Shell Evolution below the Doubly Magic Nucleus 132Sn Explored with the Long-Lived Isomer in 126Pd2014

    • Author(s)
      H. Watanabe, G. Lorusso, S. Nishimura, T. Otsuka, K. Ogawa, Z.Y. Xu, T. Sumikama, P.-A. Soderstrom, P. Doornenbal, Z. Li, F. Browne, G. Gey, H.S. Jung, J. Taprogge, Zs. Vajta, J. Wu, A. Yagi, H. Baba, G. Benzoni, H. Nishibata 他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 4 Pages: 042502-042502

    • DOI

      10.1103/physrevlett.113.042502

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of a millisecond isomeric state in 129Cd81 via the detection of internal conversion and Compton electrons2014

    • Author(s)
      J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, Z.Y. Xu, P. Doornenbal, G. Lorusso, E. Nacher, G.S. Simpson, P.-A. Soderstrom, T. Sumikama, H. Baba, F. Browne, N. Fukuda, R. Gernhauser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, H. Nishibata 他
    • Journal Title

      Phys. Lett. B

      Volume: 738 Pages: 223-227

    • DOI

      10.1016/j.physletb.2014.09.047

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 1p3/2 Proton-Hole State in 132Sn and the Shell Structure Along N= 822014

    • Author(s)
      J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G.S. Simpson, P.-A. Soderstrom, T. Sumikama, Z.Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhauser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, H. Nishibata 他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 112 Issue: 13 Pages: 132501-132501

    • DOI

      10.1103/physrevlett.112.132501

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Yrast 6+ Seniority Isomers of 136, 138Sn2014

    • Author(s)
      G.S. Simpson, G. Gey, A. Jungclaus, J. Taprogge, S. Nishimura, K. Sieja, P. Doornenbal, G. Lorusso, P.-A. Soderstrom, T. Sumikama, Z.Y. Xu, H. Baba, F. Browne, N. Fukuda, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, G.D. Kim, H. Nishibata 他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 13 Pages: 132502-132502

    • DOI

      10.1103/physrevlett.113.132502

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Isomer Decay Spectroscopy of 164Sm and 166Gd: Midshell Collectivity Around N=1002014

    • Author(s)
      Z. Patel, P.-A. Soderstrom, Zs. Podolyak, P.H. Regan, P.M. Walker, H. Watanabe, E. Ideguchi, G.S. Simpson, H.L. Liu, S. Nishimura, Q. Wu, F.R. Xu, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, H. Nishibata 他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 26 Pages: 262502-262502

    • DOI

      10.1103/physrevlett.113.262502

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Presentation] 中性子過剰Mo同位体の崩壊核分光2017

    • Author(s)
      炭竃聡之 他
    • Organizer
      日本物理学会第72回年次大会
    • Place of Presentation
      大阪大学豊中キャンパス(大阪府豊中市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] EURICA Experiments at RIKEN: Shape Transitions of Neutron-rich Zr-Mo Isotopes2016

    • Author(s)
      Jeongsu Ha, T. Sumikama, et al.
    • Organizer
      KPS 2016 Fall Meeting
    • Place of Presentation
      韓国 Gwangju
    • Year and Date
      2016-10-19
    • Related Report
      2016 Annual Research Report
  • [Presentation] Isomer search for even-even nuclei in the vicinity of 108Zr2016

    • Author(s)
      T. Sumikama et al.
    • Organizer
      International Nuclear Physics Conference 2016
    • Place of Presentation
      オーストラリア アデレード
    • Year and Date
      2016-09-11
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Decay Spectroscopy around 110Zr2016

    • Author(s)
      T. Sumikama et al.
    • Organizer
      EURICA Collaboration Meeting
    • Place of Presentation
      理研和光キャンパス(埼玉県和光市)
    • Year and Date
      2016-09-06
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improvement of beta-ion position association in implantation detector WAS3ABI and beta-gamma spectroscopy of neutron-rich Mo isotopes2016

    • Author(s)
      Jeongsu Ha et al.
    • Organizer
      EURICA Collaboration Meeting
    • Place of Presentation
      理研和光キャンパス(埼玉県和光市)
    • Year and Date
      2016-09-06
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Lifetimes of 2+ states in 104,106Zr measured using EURICA augmented with 18 LaBr3(Ce) detectors2016

    • Author(s)
      Alison Bruce et al.
    • Organizer
      EURICA Collaboration Meeting
    • Place of Presentation
      理研和光キャンパス(埼玉県和光市)
    • Year and Date
      2016-09-06
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Highlights of decay experiments at RIBF2016

    • Author(s)
      Toshiyuki Sumikama
    • Organizer
      NUSTAR Annual meeting 2016
    • Place of Presentation
      Darmstadt (Germany)
    • Year and Date
      2016-02-26
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Test experiment to produce the slowed-down 82Ge beam with the momentum-compression mode at RIBF2015

    • Author(s)
      Toshiyuki Sumikama
    • Organizer
      OEDO-SHARAQ International Collaboration Workshop
    • Place of Presentation
      東京大学和光キャンパス(埼玉県・和光市)
    • Year and Date
      2015-09-08
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] First production test of slowed-down RI beam at RIBF2015

    • Author(s)
      Toshiyuki Sumikama
    • Organizer
      International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2015)
    • Place of Presentation
      Grand Rapids (USA)
    • Year and Date
      2015-05-11
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] β-decay half-lives of neutron-rich nuclei at A~110 on r-process path2014

    • Author(s)
      西塚 一平
    • Organizer
      Fourth Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan
    • Place of Presentation
      Hilton Waikoloa Village on Hawaii's Big Island
    • Year and Date
      2014-10-07 – 2014-10-11
    • Related Report
      2014 Research-status Report
  • [Presentation] Beta Decay Half-lives in the A~110 Rregion on R-process Path2014

    • Author(s)
      西塚 一平
    • Organizer
      Advances in Radioactive Isotope Science (ARIS2014)
    • Place of Presentation
      東京大学(東京)
    • Year and Date
      2014-06-01 – 2014-06-06
    • Related Report
      2014 Research-status Report
  • [Presentation] Deformation Evolution of Neutron-rich Zr and Mo Isotopes around N=682014

    • Author(s)
      炭竃 聡之
    • Organizer
      Advances in Radioactive Isotope Science (ARIS2014)
    • Place of Presentation
      東京大学(東京)
    • Year and Date
      2014-06-01
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2022-02-16  

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