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原子核の電気双極応答測定による対称エネルギーの研究

Publicly Offered Research

Project AreaNuclear matter in neutron stars investigated by experiments and astronomical observations
Project/Area Number 25105509
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionOsaka University

Principal Investigator

民井 淳  大阪大学, 核物理研究センター, 准教授 (20302804)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords対称エネルギー / ピグミー双極共鳴 / 双極分極率 / 中性子星 / 状態方程式 / 陽子非弾性散乱 / 中性子スキン
Outline of Annual Research Achievements

本研究の目的は、原子核物質の状態方程式の対称エネルギー項の密度依存性を飽和密度付近において調べることにある。対称エネルギーは中性子星の性質、特に核子間相互作用による圧力、質量半径相関、中性子陽子密度比を決める鍵として注目されている。
申請者らがこれまでに開発してきた陽子非弾性散乱の手法を用い、中重安定核の電気双極応答を精密に測定した。得られた電気双極応答から双極分極率およびピグミー双極共鳴強度を引き出し、対称エネルギーの値に強い制限を与える。原子核表面にできる中性子の層である中性子スキンを用いることが着目点の1つである。
本年度はスズ120核を標的とするデータの解析を完了し、ピグミー双極共鳴の励起強度総量を定量的に引き出すことに成功した。これまでガンマ線で測られていた強度は実際に存在する強度のごく一部であるという画期的な成果を得た。結果を論文にまとめてPhysics Letters B誌に投稿し掲載された。また、スズ120核の双極分極率を引き出し、理論モデルの妥当性を検証するとともに、中性子スキン半径を0.148±0.034 fmと求めた。対称エネルギーの密度依存性を決定する上で鍵となるデータである。結果を論文にまとめPhysical Review Letters誌に投稿した。現在審査中である。
またNuclear Symmetry Energy 2014会議、SOTANCP会議、νIST会議などの国際会議招待講演、ワークショップ、研究会において成果を発表し、世界の物理研究者と結果および今後の計画に関する議論を深めた。
平行してsd殻核のスピンM1励起強度に関する論文をまとめ、Physical Review Letters誌に投稿した。昨年度Physical Review C誌に投稿した鉛208核の状態密度に関する論文が掲載された。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • Research Products

    (15 results)

All 2015 2014 2013 Other

All Journal Article (8 results) (of which Peer Reviewed: 8 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (6 results) (of which Invited: 5 results) Remarks (1 results)

  • [Journal Article] Low-energy electric dipole response in 120Sn2015

    • Author(s)
      A.M. Krumbholz, P. von Neumann-Cosel, T. Hashimoto, A. Tamii, T. Adachi, C.A. Bertulani, H. Fujita, Y. Fujita, E. Ganioglu, K. Hatanaka, C. Iwamoto, T. Kawabata, N.T. Khai, A. Krugmann, D. Martin, H. Matsubara, R. Neveling, H. Okamura, H.J. Ong, I. Poltoratska et al.
    • Journal Title

      Physics Letters B

      Volume: 744 Pages: 7-12

    • DOI

      10.1016/j.physletb.2015.03.023

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Fine structure of the isovector giant dipole resonance in 208Pb: Characteristic scales and level densities2014

    • Author(s)
      I. Poltoratska 他
    • Journal Title

      Physical Review C

      Volume: 89 Issue: 5

    • DOI

      10.1103/physrevc.89.054322

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 中性子スキンと原子核物質の状態方程式2014

    • Author(s)
      民井淳、銭廣十三
    • Journal Title

      日本物理学会誌

      Volume: 69 Pages: 6-13

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electric dipole response of 208Pb probed by proton inelastic scattering: constraints on the neutron skin thickness and symmetry energy2014

    • Author(s)
      A. Tamii 他
    • Journal Title

      European Physics Journal A

      Volume: 50 Issue: 2

    • DOI

      10.1140/epja/i2014-14028-7

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei2014

    • Author(s)
      Y. Fujita, H. Fujita, T. Adachi, C. L. Bai, A. Algora, M. Honma, K. Matsuyanagi, B. Rubio, H. Sagawa, A. Tamii et al.
    • Journal Title

      Physical Review Letters

      Volume: 112 Issue: 11 Pages: 1125021-5

    • DOI

      10.1103/physrevlett.112.112502

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Probing effect of tensor interactions in 16O via (p,d) reaction.2013

    • Author(s)
      H.J. Ong, I. Tanihata et al.,
    • Journal Title

      Physics Letters B

      Volume: 725 Issue: 4-5 Pages: 277-281

    • DOI

      10.1016/j.physletb.2013.07.038

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Studies of Electric Dipole Response in Nuclei Using the Scattering of Polarized Protons2013

    • Author(s)
      A. Tamii
    • Journal Title

      Acta Physica Polonica B

      Volume: 44 Issue: 3 Pages: 571-580

    • DOI

      10.5506/aphyspolb.44.571

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Isospin mixing of the isobaric analog state studied in a high-resolution 56Fe(3He, t)56Co reaction2013

    • Author(s)
      H. Fujita, Y. Fujita, T. Adachi, H. Akimune, N. T. Botha, R. Neveling, F. D. Smit, A. Tamii et al.
    • Journal Title

      Physical Review C

      Volume: 88 Issue: 5 Pages: 0543291-6

    • DOI

      10.1103/physrevc.88.054329

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Presentation] Giant Resonancesand Their Gamma Emissivity2015

    • Author(s)
      A. Tamii
    • Organizer
      International Workshop on Neutrino Physics and Astrophysics (νIST2015)
    • Place of Presentation
      Istanbul University, Istanbul, Turkey
    • Year and Date
      2015-03-16 – 2015-03-20
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] E1 and spin-M1 responses of nuclei probed by proton inelastic scattering2014

    • Author(s)
      A. Tamii
    • Organizer
      Neutrino Nuclear Response 2014
    • Place of Presentation
      Osaka University, Ibaraki, Japan
    • Year and Date
      2014-11-05 – 2014-11-06
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Electric dipole response of nuclei studied by proton inelastic scattering2014

    • Author(s)
      A. Tamii
    • Organizer
      日米合同物理学会
    • Place of Presentation
      Hilton Waikoloa Village, Hawai, USA
    • Year and Date
      2014-10-08 – 2014-10-11
    • Related Report
      2014 Annual Research Report
  • [Presentation] From Neutron Rich Nuclei to Low Mass Neutron Stars (I)2014

    • Author(s)
      A. Tamii
    • Organizer
      日米合同物理学会ミニワークショップ「中性子星」
    • Place of Presentation
      Hilton Waikoloa Village, Hawai, USA
    • Year and Date
      2014-10-07
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Complete measurement of Electric Dipole Response of 120Sn2014

    • Author(s)
      T. Hashimoto
    • Organizer
      4th International Symposium on the Nuclear Symmetry Energy (NuSYM14)
    • Place of Presentation
      University of Liverpool, Liverpool, UK
    • Year and Date
      2014-07-07 – 2014-07-09
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Spin-M1 and E1 Responses of Nuclei Probed by Proton Inelastic Scattering2014

    • Author(s)
      A. Tamii
    • Organizer
      State of the Art in Nuclear Cluster Physics (SOTANCP3)
    • Place of Presentation
      Kanto Gakuin University, Yokohama, Japan
    • Year and Date
      2014-05-26 – 2014-05-30
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Remarks] プレスリリース: 原子核の中性子皮の振動の分離観測に成功

    • URL

      http://www.rcnp.osaka-u.ac.jp/jp/topics/press_release-120619.pdf

    • Related Report
      2014 Annual Research Report

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Published: 2013-05-15   Modified: 2019-07-29  

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