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Study of neutron matter equation of state with proton and neutron density distributions of unstable nuclei

Research Project

Project/Area Number 15H05451
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Zenihiro Juzo  国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 研究員 (70529057)

Research Collaborator Terashima Satoru  
Matsuda Yohei  
Sakaguchi Harutaka  
Uesaka Tomohiro  
Ota Shinsuke  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥20,670,000 (Direct Cost: ¥15,900,000、Indirect Cost: ¥4,770,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Fiscal Year 2015: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Keywords核物質状態方程式 / 中性子星 / 中性子密度分布 / 不安定核 / 陽子弾性散乱 / 中性子スキン / 大強度RIビーム / 原子核実験物理 / 状態方程式 / 実験核物理 / 中性子核物質状態方程式 / 不安定核陽子弾性散乱測定 / 大強度RIビーム実験 / 大強度RIビーム生成
Outline of Final Research Achievements

In order to understand the nuclear matter equation of state (EOS), especially the isospin asymmetry term, so-called "symmetry energy", we have established the method to directly determine the nucleon density distributions and the neutron skin thicknesses because the symmetry energy is known to have strong correlation with the neutron skin thicknesses of double magic nuclei. We have also extended this experimental method to unstable nuclei, finally have successfully measured proton elastic scattering of 132Sn in inverse kinematics. In addition, we have developed new methods to investigate the EOS with the systematic change of density distributions, or alpha-clustering in medium-heavy nucleus.

Academic Significance and Societal Importance of the Research Achievements

宇宙に存在する天体現象や元素の起源の解明は物理学における非常に重要なテーマの一つである。特に中性子星と呼ばれる天体は中性子でできた巨大な原子核とでも言うべき物質で、特に重い元素の生成起源として大いに注目されている。しかしその構造やダイナミクスについてはまだ良くわかっていない。そこで鍵となるのが、核子(陽子・中性子)を構成要素とする物質(核物質)の状態方程式である。特に陽子が極端に少ない系はそのまま中性子星の構造を示していることに他ならない。核物質の特に中性子物質の状態方程式を知ることはそのまま宇宙の成り立ちを知ることにつながっているのである。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (19 results)

All 2019 2018 2017 Other

All Int'l Joint Research (5 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Int'l Joint Research] Institut de Physique Nuclaire, Orsay(フランス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] University of Hong Kong(その他の国・地域)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Beihang University(中国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] INFN Milano(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] MTA ATOMKI(ポーランド)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7-2.7 fm-1 as a probe of the nuclear matter density of 6He2018

    • Author(s)
      S. Chebotaryov, S. Sakaguchi (62人中2番目), et al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 5 Issue: 5 Pages: 1-20

    • DOI

      10.1093/ptep/pty048

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Proton elastic scattering from stable and unstable nuclei ? Extraction of nuclear densities2017

    • Author(s)
      Sakaguchi H.、Zenihiro J.
    • Journal Title

      Progress in Particle and Nuclear Physics

      Volume: 97 Pages: 1-52

    • DOI

      10.1016/j.ppnp.2017.06.001

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ESPRI project and Nuclear density distributions2019

    • Author(s)
      J. Zenihiro
    • Organizer
      子光理学研究センター拠点研究会, 電子散乱による原子核研究 -陽子半径、不安定核の電荷密度分布を中心に-
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Direct determination of neutron skin thickness of 48Ca from proton elastic scattering and the ESPRI project2018

    • Author(s)
      J. Zenihiro
    • Organizer
      Hawaii2018 Fifth Joint Meeting of the Nuclear Physics Divisions of the APS and JPS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New detector design for (p,p), (p,pX) experiments2018

    • Author(s)
      J. Zenihiro
    • Organizer
      SAMURAI Workshop, RIBF week 2018
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 炭素14偏極陽子弾性散乱測定の現状2018

    • Author(s)
      松田洋平
    • Organizer
      日本物理学会第73回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 大強度イオンビーム用のXeガスシンチレーション検出器の開発2018

    • Author(s)
      原田知也
    • Organizer
      日本物理学会第73回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Direct determination of neutron skin thickness of 48Ca via proton elastic scattering2018

    • Author(s)
      J. Zenihiro
    • Organizer
      13th International conference on nucleus-nucleus collisions (NN2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Direct determination of neutron density profiles via proton elastic scattering2018

    • Author(s)
      J. Zenihiro
    • Organizer
      Workshops on HIAF physics, Nuclear Astrophys., Radii & EOS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 大強度重イオンビーム用のXe ガスシンチレーション検出器の開発2018

    • Author(s)
      原田知也, 銭廣十三, 松田洋平, 坂口治隆, 寺嶋知, 大田晋輔, 堂園昌伯, 川田敬太, 石田駿野, 笠松幸生, 高田栄一
    • Organizer
      日本物理学会 第73回年次大会(2018年)
    • Related Report
      2017 Annual Research Report
  • [Presentation] 不安定核ビームのTOF検出器としてのガスシンチレーション検出器の開発2018

    • Author(s)
      石田駿野, 松田洋平, 伊藤正俊, 石橋陽子, 岡本潤, 烏谷晃平, 笠松幸生, 銭廣十三, 原田知也, 坂口治隆, 寺嶋知, 大田晋輔, 堂園昌伯, 川田敬太, 高田栄一
    • Organizer
      日本物理学会 第73回年次大会(2018年)
    • Related Report
      2017 Annual Research Report
  • [Presentation] 炭素14偏極陽子弾性散乱測定の現状2018

    • Author(s)
      松田洋平, 坂口治隆, 寺嶋知, 銭廣十三, 伊藤正俊, 石橋陽子, 岡本潤, 那須裕, 秋宗秀俊, 平郡克吉, 川畑貴裕, 村上哲也, 津村美保, 古野達也, 村田求基, 稲葉健斗, 高橋祐羽, 武田朋也, 前田幸重, 原田知也
    • Organizer
      日本物理学会 第73回年次大会(2018年)
    • Related Report
      2017 Annual Research Report
  • [Presentation] パラ水素を用いた薄型自己保持固体水素標的の開発2017

    • Author(s)
      高橋祐羽, 稲葉健斗, 川畑貴裕, 武田朋也, 津村美保, 古野達也, 村田求基, 森本貴博, 松田洋平, 銭廣十三
    • Organizer
      日本物理学会 2017年秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 偏極陽子弾性散乱実験のための炭素14標的の開発2017

    • Author(s)
      松田洋平, 坂口治隆, 寺嶋知, 銭廣十三, 秋宗秀俊, 村田求基, 岡本潤
    • Organizer
      日本物理学会 2017年秋季大会
    • Related Report
      2017 Annual Research Report

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Published: 2015-04-16   Modified: 2020-03-30  

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