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Study of the EC and bound state β decay and its half-life on the highly charged ions.

Research Project

Project/Area Number 19204023
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionSaitama University

Principal Investigator

SUZUKI Takeshi (SUZUKI Takishi)  Saitama University, 大学院・理工学研究科, 教授 (10196842)

Co-Investigator(Kenkyū-buntansha) YAMAGUCHI Takayuki  埼玉大学, 大学院・理工学研究科, 准教授 (10375595)
OHTUBO Takashi  新潟大学, 大学院・自然科学研究科, 准教授 (70262425)
IZUMIKAWA Takuji  新潟大学, アイソトープ総合センター, 准教授 (60282985)
Project Period (FY) 2007 – 2010
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥43,810,000 (Direct Cost: ¥33,700,000、Indirect Cost: ¥10,110,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2009: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2008: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2007: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
Keywords多価イオン状態核 / EC崩壊 / 束縛状態β崩壊 / 束縛状態α崩壊 / 水素様イオン / 電子捕獲崩壊 / ヘリウム様イオン / 非指数関数崩壊曲線 / ニュートリノ振動 / α崩壊半減期 / 重イオン蓄積リング / 核破砕片 / 高分解能TOF検出器 / シリコン半導体検出器
Research Abstract

In order to test the M-dependence of T_<Lab> required by the "neutrino hypothesis" we investigated the EC decay of H-like ^<122>I^<52+> ions. They exhibit a well-pronounced modulation with a period of T_<Lab> ~6s superimposed on the exponential decay. This period, being in perfect agreement to the predicted scaling with the mass of the parent ion M, corroborates the "neutrino hypothesis", if verified in the final data evaluation. The data analysis on the EC decay of He-like ^<142>Pm^<60+> is in progress.

Report

(6 results)
  • 2010 Annual Research Report   Final Research Report ( PDF )
  • 2009 Annual Research Report   Self-evaluation Report ( PDF )
  • 2008 Annual Research Report
  • 2007 Annual Research Report
  • Research Products

    (42 results)

All 2011 2010 2009 2008 2007 Other

All Journal Article (25 results) (of which Peer Reviewed: 24 results) Presentation (11 results) Remarks (6 results)

  • [Journal Article] Direct mass measurements of short-lived A=2Z-I nuclides^<63>Ge, ^<65>As, ^<67>Se and ^<71>Kr and their impact on nucleosvnthesis in the rp process2011

    • Author(s)
      X.L.Tu, T.Yamaguchi, et al.
    • Journal Title

      Physical Review Letters

      Volume: in press

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Density distribution of ^<17>Ne and possible shell-structure change in the proton-rich sd-shell nuclei2010

    • Author(s)
      K.Tanaka, T.Suzuki, T.Ohtsubo, T.Izumikawa, T.Yamaguchi, 他
    • Journal Title

      Phys.Rev.C 82

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Energy-dependent charge changing cross sections and proton distribution of ^<28>Si2010

    • Author(s)
      T. Yamaguchi, T. Ohtsubo, T. Suzuki, 他
    • Journal Title

      Phys.Rev.C 82

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Discovery and Investigation of Heavy Neutron-Rich Isotopes with Time-Resolved Schottky Spectrometry in the Element Range from Thallium to Actinium2010

    • Author(s)
      L.Chen, T.Ohtsubo, T.Yamaguchi, 他
    • Journal Title

      Phys.Lett.B 691

      Pages: 234-237

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Discovery of Highly Excited Long-Lived Isomers in Neutron-Rich Hafnium and Tantalum Isotopes through Direct Mass2010

    • Author(s)
      Measurements M W.Reed, T.Yamaguchi, 他
    • Journal Title

      Phys.Rev.Lett. 105

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Observation of a large Reaction Cross -Section in the Drip-Line Nucleus ^<22>C2010

    • Author(s)
      K.Tanaka, T.Yamaguchi, T.Suzuki, T.Ohtsubo, T.Izumikawa, 他
    • Journal Title

      Phys.Rev.Lett. 104

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Direct measurement of the 4.6 MeV isomer in stored bare ^<133>Sb ions2010

    • Author(s)
      B.Sun, T.Ohtsubo, T.Suzuki, T.Yamaguchi, 他
    • Journal Title

      Phys.Lett.B 688

      Pages: 294-297

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Direct measurement of the 4.6 MeV isomer in stored bare ^<133>Sb ions2010

    • Author(s)
      B.Sun, T.Ohtsubo, et al.
    • Journal Title

      Physics Letters B

      Volume: 688 Pages: 294-297

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Energy-dependent charge changing cross sections and proton distribution of ^<28>Si2010

    • Author(s)
      T.Yamaguchi, T.Suzuki, et al.
    • Journal Title

      Physical Review C

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of a large Reaction Cross-Section in the Drip-Line Nucleus ^<22>C2010

    • Author(s)
      K. Tanaka, T. Yamaguchi, T. Suzuki, T. Ohtsubo, T. Izumikawa, 総員36名
    • Journal Title

      Physical Review Letters 104

    • URL

      http://prl.aps.org/abstract/PRL/v104/i6/e062701

    • Related Report
      2009 Self-evaluation Report
    • Peer Reviewed
  • [Journal Article] Observation of a large Reaction Cross-Section in the Drip-Line Nucleus ^<22>C2010

    • Author(s)
      K.Tanaka, T.Yamaguchi, et al.
    • Journal Title

      Physical Review Letters 104

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reaction cross sections at intermediate energies and Fermi motion effect2009

    • Author(s)
      M.Takechi, T.Ohtsubo, T.Izumikawa, T.Suzuki, T.Yamaguchi, 他
    • Journal Title

      Phys.Rev.C 79

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Schottky mass measurement of ^<208>Hg isotope implication for the proton-neutroninteraction strength around doubly magic ^<208>Pb2009

    • Author(s)
      L.Chen T.Ohtsubo, T.Yamaguchi, 他
    • Journal Title

      Phys.Rev.Lett. 102

    • Related Report
      2010 Final Research Report
  • [Journal Article] Reaction cross sections at intermediate energies and Fermi motion effect2009

    • Author(s)
      M. Takechi, T. Ohtsubo, T. Izumikawa, T. Suzuki, T. Yamaguchi, 総員25名
    • Journal Title

      Physical Review C 79

    • URL

      http://pre.aps.org/abstract/PRC/v79/i6/e061601

    • Related Report
      2009 Self-evaluation Report
    • Peer Reviewed
  • [Journal Article] Reaction cross sections at intermediate energies and Fermi motion effect2009

    • Author(s)
      M.Takechi, T.Suzuki, et al.
    • Journal Title

      Physical Review C 79

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New scheme for precision mass measurements of rare isotopes produced at RI Beam Factory2008

    • Author(s)
      S.Nakajima, T.Yamaguchi, T.Suzuki, T.Ohtsubo, 他
    • Journal Title

      Acta Physica Polonica B Vol.39

      Pages: 457-462

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Rare-RI Ring project at RIKEN RI Beam Factory2008

    • Author(s)
      Y.Yamaguchi, T.Ohtsubo, T.Suzuki, T.Yamaguchi, 他
    • Journal Title

      Nucl.Instr.Methods B 266

      Pages: 4575-4578

    • NAID

      120006385852

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of reaction cross section of ^<18>C and observations of fragments from ^<17>C and ^<18>C at 80A MeV2008

    • Author(s)
      A.Ozawa, T.Izumikawa, T.Ohtsubo, T.Suzuki, 他
    • Journal Title

      Phys.Rev.C 78

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Nuclear structure studies of short-lived neutron-rich nuclei with the novel large-scale isochronous mass spectrometry at the FRS-ESR facility2008

    • Author(s)
      B.Sun, T. Ohtsubo, T. Suzuki, T. Yamaguchi, 他
    • Journal Title

      Nucl.Phys.A 812

      Pages: 1-12

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Nuclear structure studies of short-lived neutron-rich nuclei with the novel large-scale isochronous mass spectrometry at the FRS-ESR facility2008

    • Author(s)
      B.Sun, T.Yamaguhci, T.Suzuki,他32名
    • Journal Title

      Nuclear Physics A・812

      Pages: 1-12

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large proton contribution to the 2+excitation in 20Mg studied by intermediate energy inelastic scattering2008

    • Author(s)
      N. Iwasa, T. Suzuki, 他31名
    • Journal Title

      Phys. Rev C・78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of reaction cross section of I8C and observations of fragments from 17C and 18C at 80A MeV2008

    • Author(s)
      A. Ozawa, T.Izumikawa, T. Ohtsubo, T. Suzuki, 他13名
    • Journal Title

      Phys. Rev C・78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nuclear matter radii of neutron deficient Kr isotopes2008

    • Author(s)
      T. Yamaguhci, T. Suzuki, 他26名
    • Journal Title

      Physical Review C, 掲載確定

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Status of the Experimental Program on Mass Measurements of Stored Exotic Nuclei at the FRS-ESR Facility2007

    • Author(s)
      Yu.A.Litvinov, T.Ohtsubo, T.Suzuki, T.Yamaguchi,他
    • Journal Title

      Nucl.Phys.A 787

      Pages: 315-320

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Direct mass measurements of short-lived A=2Z-1 nuclides ^<63>Ge, ^<65>As, ^<67>Se and ^<71>Kr and their impact on nucleosynthesis in the rp process

    • Author(s)
      X.L.Tu, T.Yamaguchi, 他
    • Journal Title

      Phys.Rev.Lett.accepted.

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Presentation] Measurement of interaction cross sections for neutron-rich Na Isotopes2010

    • Author(s)
      T.Kuboki, T.Suzuki, et al.
    • Organizer
      Zacopan Conference on Nuclear Physics 2010
    • Place of Presentation
      Zakopane Poland
    • Year and Date
      2010-09-04
    • Related Report
      2010 Annual Research Report
  • [Presentation] Decay curve study in a standard electron capture decay2009

    • Author(s)
      D. Nishimura, T. Izumikawa, T. Ohtsubo, T. Suzuki, T. Yamaguchi. 総員12名
    • Organizer
      Japan-China Joint Symposium on Nuclear Physics
    • Place of Presentation
      日本・つくば市
    • Year and Date
      2009-11-11
    • Related Report
      2009 Self-evaluation Report
  • [Presentation] Measurements of nuclear radii for neutron rich Ne isotopes ^<28-32>Ne2009

    • Author(s)
      T. Ohtsubo
    • Organizer
      International Conference on Radioactive Nuclear Beam8
    • Place of Presentation
      米国・ミシガン州
    • Year and Date
      2009-06-18
    • Related Report
      2009 Self-evaluation Report
  • [Presentation] Measurements of nuclear radii for neutron-rich Ne isotopes ^<28-32>Ne2009

    • Author(s)
      T.Ohtsubo
    • Organizer
      RadioactiveNuclearBeam8
    • Place of Presentation
      米国・ミシガン州
    • Year and Date
      2009-06-18
    • Related Report
      2009 Annual Research Report
  • [Presentation] Decay curve study in a standard electron capture decay2009

    • Author(s)
      D.Nishimura, T.Izumikawa, T.Ohtsubo, T.Suzuki, T.Yamaguchi, 他
    • Organizer
      AIP conference proceedings 1235 (2010) 219-222. The 7th China-Japan Joint Nuclear Physics Symposium, Tsukuba, Japan
    • Related Report
      2010 Final Research Report
  • [Presentation] Measurements of nuclear radii for neutron-rich Ne isotopes ^<28-32>Ne(Nucl. Phys. A834 (2010) 412-415.)2009

    • Author(s)
      M.Takechi, T.Ohtsubo, T.Suzuki, T.Yamaguchi, 他
    • Organizer
      The 10th Int'l Conference in Nucleus ・Nucleus Collisions (NN2009)
    • Place of Presentation
      Beijing,China
    • Related Report
      2010 Final Research Report
  • [Presentation] Electron Screening effects on α-decay2009

    • Author(s)
      A. Musumarra, T. Ohtsubo, T. Suzuki, T. Yamaguchi, 他
    • Organizer
      AIP conference proceedings, accepted. Nuclear Structure and Dynamics (NSD09)
    • Place of Presentation
      Dubrovnik, Croatia
    • Related Report
      2010 Final Research Report
  • [Presentation] 反応断面積によるA=3体系の核半径2008

    • Author(s)
      吉竹利織・山口貴之・他28名
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学(東大阪市)
    • Year and Date
      2008-03-29
    • Related Report
      2008 Annual Research Report
  • [Presentation] Storage-ring mass spectrometry2008

    • Author(s)
      T. Yamaguchi
    • Organizer
      ECT workshop "Mass Olympics (invited 査読無)
    • Place of Presentation
      Trento, Italy
    • Related Report
      2010 Final Research Report
  • [Presentation] Proton skin in neutron-deficient nuclei studied via interaction cross sections at relativistic energies2007

    • Author(s)
      T.Yamaguchi, et. al.
    • Organizer
      Int'l.Conf.on Pro-Con.,
    • Place of Presentation
      リスボン大学、ポルトガル
    • Year and Date
      2007-06-23
    • Related Report
      2007 Annual Research Report
  • [Presentation] Large-scale mass measurements of short-lived nuclides with the isochronous mass spectrometry at GSI

    • Author(s)
      B.Sun, T.Ohtsubo, T.Suzuki, T.Yamaguchi, 他
    • Organizer
      Int'l J.of Phys.E
    • Related Report
      2010 Final Research Report
  • [Remarks] ホームページ等

    • URL

      http://www.ne.phy.saitama-u.ac.jp/~suzuki/index.html

    • Related Report
      2010 Final Research Report
  • [Remarks]

    • URL

      http://www.ne.phy.saitama-u.ac.jp/~suzuki/index.html

    • Related Report
      2010 Annual Research Report
  • [Remarks] ホームページ

    • URL

      http://www.ne.phy.saitama-u.ac.jp/-suzuki/index.html

    • Related Report
      2009 Self-evaluation Report
  • [Remarks]

    • URL

      http://www.ne.phy.saitama-u.ac.jp/~suzuki/index.html

    • Related Report
      2009 Annual Research Report
  • [Remarks]

    • URL

      http://www.ne.phy.saitama-u.ac.jp/~suzuki/index.html

    • Related Report
      2008 Annual Research Report
  • [Remarks]

    • URL

      http://www.ne.phy.saitama-u.ac.jp/~suzuki/index.html

    • Related Report
      2007 Annual Research Report

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Published: 2007-04-01   Modified: 2021-12-06  

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