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Evolution of shell structure and mechanism of sudden prevalence of collective motions in very asymmetric proton/neuron number systems

Research Project

Project/Area Number 19340061
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

SHIMODA Tadashi  Osaka University, 大学院・理学研究科, 教授 (70135656)

Co-Investigator(Kenkyū-buntansha) ODAHARA Atsuko  大阪大学, 大学院・理学研究科, 准教授 (30264013)
FUKUCHI Tomonori  大阪大学, 大学院・理学研究科, 特任研究員 (40376546)
SUZUKI Tomokazu  大阪大学, 核物理研究センター, 特任研究員 (80506395)
MIYATAKE Hironari  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)
HIRAYAMA Yoshikazu  高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (30391733)
Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2008: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2007: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Keywords中性子過剰核 / 単一粒子軌道の変化 / intruder configuration / スピン偏極 / ベータ崩壊 / 中性子魔法数20 / Mgアイソトープ / TRIUMF / shell model計算 / intruder state / ベータ・ガンマ分光 / スピン・パリティ / 魔法数の変化 / 単一粒子軌道 / β崩壊の非対称度 / 28,29Mgの構造 / カナダ国立素粒子原子核研究所
Research Abstract

陽子数と中性子数が極端に異なる原子核(非対称核子系、短寿命核)では核子数の非対称度とともに殻構造が大きく変化するのではないかという20年来の問題を解決するために、独自の手法を用いた実験を行った。その結果、^<29>Mg.の励起エネルギー4MeV以下の状態のスピン・パリティを全て(9つの状態)決定することに始めて成功した。第2、第3励起状態がマイナス・パリティ状態であるという新しく発見された事実は、非対称度の変化の伴う殻構造の変化を如実に示すものであり、その原因解明の大きな手がかりを与えた。

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (21 results)

All 2010 2009 2008 2007 Other

All Journal Article (3 results) Presentation (17 results) Remarks (1 results)

  • [Journal Article] Nuclear structure studies through β-delayed decay spectroscopy of polarized radioactive nuclei2008

    • Author(s)
      T. Shimoda, Y. Hirayama, H. Izumi, A. Hatakeyama, K.P. Jackson, C.D.P. Levy, H. Miyatake, M. Yagi, H. Yano, A. Odahara, T. Fukuchi, K. Tajiri, K. Kura, T. Hori, T. Masue
    • Journal Title

      Nuclear Physics A805

      Pages: 299-301

    • Related Report
      2008 Final Research Report
  • [Journal Article] 原子核の研究の新展開-レーザーを利用してスピンの向きを制御する-2007

    • Author(s)
      下田正
    • Journal Title

      生産と技術 69巻、第2号

      Pages: 62-68

    • NAID

      40015978120

    • Related Report
      2008 Final Research Report
  • [Journal Article] レーザーが切り拓く不安定核研究の新局面2007

    • Author(s)
      下田 正
    • Journal Title

      山田科学振興財団ニュース 通巻57号

      Pages: 11-11

    • Related Report
      2007 Annual Research Report
  • [Presentation] Structure of Neutron-Rich 28, 29Mg Studied throughβ-decay of Spin Polarized 28, 29Na Beams at TRIUMF2010

    • Author(s)
      K. Tajiri, T. Shimoda, et al.
    • Organizer
      Int. Symp. on Forefronts of Researches in Exotic Nuclear Structures-Niigata2010
    • Place of Presentation
      Niigata, Japan
    • Year and Date
      2010-03-04
    • Related Report
      2008 Final Research Report
  • [Presentation] Structure of Neutron-Rich 28, 29Mg Studied through beta-decay of Spin Polarized 28, 29Na Beams at TRIUMF2010

    • Author(s)
      K.Tajiri
    • Organizer
      Int.Symp.on Forefronts of Researches in Exotic Nuclear Structures -Niigata2010
    • Place of Presentation
      Niigata, Japan
    • Year and Date
      2010-03-04
    • Related Report
      2008 Annual Research Report
  • [Presentation] Structure of Mg isotopes explored by beta-decay of spin-polarize Na isotopes2010

    • Author(s)
      T. Shimoda, et al.
    • Organizer
      EFES-NSCL workshop on Perspectives on the modern shell model and related experimental topics
    • Place of Presentation
      Michigan, USA
    • Year and Date
      2010-02-04
    • Related Report
      2008 Final Research Report
  • [Presentation] Structure of Mg isotopes explored by beta-decay of spin-polarize Na isotopes2010

    • Author(s)
      T.Shimoda
    • Organizer
      EFES-NSCL workshop on Perspectives on the modern shell model and related experimental topics
    • Place of Presentation
      Michigan, State University, USA
    • Year and Date
      2010-02-04
    • Related Report
      2008 Annual Research Report
  • [Presentation] The Structure of Neutron-Rich 28, 29Mg Studied throughβ-Decay of Spin-Polarized 28, 29Na Beams at TRIUMF2009

    • Author(s)
      K. Tajiri, T. Shimoda, et al.
    • Organizer
      Third Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and the Physical Society of Japan
    • Place of Presentation
      Hawaii, USA
    • Year and Date
      2009-10-17
    • Related Report
      2008 Final Research Report
  • [Presentation] The Structure of Neutron-Rich 28, 29Mg Studied through beta-Decay of Spin-Polarized 28, 29Na Beams at TRIUMF2009

    • Author(s)
      K.Tajiri
    • Organizer
      Third Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and the Physical Society of Japan
    • Place of Presentation
      Hawaii, USA
    • Year and Date
      2009-10-13
    • Related Report
      2008 Annual Research Report
  • [Presentation] Structure of 30Mg studied through b decay of polarized 30Na2009

    • Author(s)
      Y.Kenmoku
    • Organizer
      The 8th CNS-EFES Int.Summer School(CNS-EFES09)
    • Place of Presentation
      Wako, Japan
    • Year and Date
      2009-08-26
    • Related Report
      2008 Annual Research Report
  • [Presentation] TRIUMFにおける偏極した29Naのβ崩壊による29Mgの構造の研究2008

    • Author(s)
      田尻邦彦、下田正, 他
    • Organizer
      日本物理学会、秋季大会
    • Place of Presentation
      山形大学
    • Year and Date
      2008-09-21
    • Related Report
      2008 Final Research Report
  • [Presentation] TRIUMFにおける偏極した28Naのβ崩壊による28Mgの構造の研究2008

    • Author(s)
      倉健一朗、下田正, 他
    • Organizer
      日本物理学会、秋季大会
    • Place of Presentation
      山形大学
    • Year and Date
      2008-09-21
    • Related Report
      2008 Final Research Report
  • [Presentation] Structure of neutron-rich Mg isotopes throughβ-delayed of spin-polarized Na isotopes2008

    • Author(s)
      T. Shimoda, et al.
    • Organizer
      CNS-RIKEN Joint Int. Symp. on Frontier of gamma-ray spectroscopy and Perspectives for Nuclear Structure Studies (gamma08)
    • Place of Presentation
      Wako, Saitama, Japan
    • Year and Date
      2008-04-05
    • Related Report
      2008 Final Research Report
  • [Presentation] RIUMFにおける偏極したNaアイソトープのβ崩壊による中性子過剰なMgの構造の研究22008

    • Author(s)
      田尻邦彦、下田正, 他
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Year and Date
      2008-03-24
    • Related Report
      2008 Final Research Report
  • [Presentation] TRIUMFにおける偏極したNaアイソトープのβ崩壊による中性子過剰なMgの構造の研究12008

    • Author(s)
      倉健一朗、下田正, 他
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Year and Date
      2008-03-24
    • Related Report
      2008 Final Research Report
  • [Presentation] Structure of Exotic Nuclei Probed by Spin-Polarized Radioactive Beams2008

    • Author(s)
      T. Shimoda, et al.
    • Organizer
      Int. Workshop, Halo08
    • Place of Presentation
      Vancouver, Canada
    • Year and Date
      2008-03-17
    • Related Report
      2008 Final Research Report
  • [Presentation] Structure of Nuclei Studied with Polarized Radioactive Nuclear Beams at TRIUMF2008

    • Author(s)
      下田 正
    • Organizer
      The international workshop on "Advance in Physics with ISOL-based/Fragmentation-based RI Beams"
    • Place of Presentation
      東京工業大学
    • Year and Date
      2008-02-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Structure of nuclei studied with polarized radioactive nuclear beams at TRIUMF2008

    • Author(s)
      T. Shimoda, et al.
    • Organizer
      Workshop on "Advance in Physics with ISOL-based/ Fragmentation-based RI Beams"
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2008-02-02
    • Related Report
      2008 Final Research Report
  • [Presentation] Nuclear structure studies throughβ-delayed decay spectroscopy of polarized radioactive nuclei2007

    • Author(s)
      T. Shimoda, et al.
    • Organizer
      Int. Nuclear Physics Conf. (INPC2007)
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2007-06-05
    • Related Report
      2008 Final Research Report
  • [Presentation] Nuclear Structure Studies through β-Delayed Decay Spectroscopy of Spin-Polarized Radioactive Nuclei2007

    • Author(s)
      下田 正
    • Organizer
      International Nuclear Physics Conference 2007
    • Place of Presentation
      東京国際フォーラム
    • Year and Date
      2007-06-05
    • Related Report
      2007 Annual Research Report
  • [Remarks]

    • URL

      http://adam.phys.sci.osaka-u.ac.jp/

    • Related Report
      2008 Final Research Report

URL: 

Published: 2007-04-01   Modified: 2016-04-21  

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