Study of Neutron-halo and shape coexistence near the neutron-drip line

• Project/Area Number: 25400240
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hokkaido University
• Principal Investigator: KIMURA Masaaki 北海道大学, 理学(系)研究科(研究院), 准教授 (50402813)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 中性子過剰核 / 変形共存 / 中性子ハロー / 原子核半径 / クラスター / 核半径 / 陽子分布半径 / 不安定核 / 反応断面積

Outline of Final Research Achievements

In this study, I investigated the radii and deformation of neutron-rich nuclei. I also focused on the neutron halo which can be formed in the drip-line nuclei. I employ the theoretical model of antisymmtrized molecular dymamics and studied various isotopes. The obtained results are follows. (1) The relationship between the nuclear deformation of neutro-rich nuclei and the increase of the reaction cross section was found. (2) It was found that several nuclei such as 37Mg may have neutron-halo. (3) The relationship between the development of clustering and the increase of charge changing cross section was pointed out.

Research Products

• [Journal Article] Isoscalar dipole transition as a probe for asymmetric clustering (2016)
  • Author(s): Y. Chiba, M. Kimura and Y. Taniguchi
  • Journal Title: Phys. Rev. C Volume: 93 Issue: 3 Pages: 0343191-12
  • DOI: 10.1103/physrevc.93.034319
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Constraining the density dependence of the nuclear symmetry energy from an x-ray bursting neutron star (2015)
  • Author(s): Hajime Sotani, Kei Iida, Kazuhiro Oyamatsu
  • Journal Title: Physical Review C Volume: 91 Issue: 1 Pages: 0143151-5
  • DOI: 10.1103/physrevc.91.014314
  • NAID: 120005555487
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Superdeformation of Ar hypernuclei (2015)
  • Author(s): Masahiro Isaka,Masaaki Kimura,Emiko Hiyama, and Hiroyuki Sagawa
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 103D02 Issue: 10 Pages: 1-9
  • DOI: 10.1093/ptep/ptv138
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Impurity effects of the Lambda particle on the 2alpha cluster states of 9Be and 10Be (2015)
  • Author(s): M. Isaka and M. Kimura
  • Journal Title: PHYSICAL REVIEW C Volume: 92 Issue: 4 Pages: 1-9
  • DOI: 10.1103/physrevc.92.044326
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Cluster states and isoscalar monopole transitions of 24Mg (2015)
  • Author(s): Y. Chiba, M. Kimura
  • Journal Title: Phys. Rev. C Volume: 91 Issue: 6 Pages: 0613021-5
  • DOI: 10.1103/physrevc.91.061302
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Low-lying 2+ states generated by pn-quadrupole correlation and N = 28 shell quenching (2015)
  • Author(s): S.Ebata, M.Kimura
  • Journal Title: Physical Review Volume: C91 Issue: 1
  • DOI: 10.1103/physrevc.91.014309
  • NAID: 120005593447
  • Peer Reviewed
• [Journal Article] Collectivity and instability of the N=Z=28 shell gap and strongly deformed bands with g9/2 configuration in 56Ni (2014)
  • Author(s): Yohei Chiba, Masaaki Kimura
  • Journal Title: Phys. Rev. C Volume: 89 Issue: 5
  • DOI: 10.1103/physrevc.89.054313
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Proton Radii of 12-17B Define a Thick Neutron Surface in 17B (2014)
  • Author(s): A. Estrad, R. Kanungo, W. Horiuchi, et al.,
  • Journal Title: Phys.Rev.Lett. Volume: 113 Issue: 13 Pages: 1-4
  • DOI: 10.1103/physrevlett.113.132501
  • Peer Reviewed / Open Access
• [Journal Article] Ground-state properties of neutron-rich Mg isotopes (2014)
  • Author(s): S. Watanabe, K. Minomo, M. Shimada, S. Tagami, M. Kimura, M. Takechi, M. Fukuda, D. Nishimura, T. Suzuki, T. Matsumoto, Y. R. Shimizu, and M. Yahiro
  • Journal Title: Physical Review C Volume: 89 Issue: 4 Pages: 044610-044610
  • DOI: 10.1103/physrevc.89.044610
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Proton radius of 14Be from measurement of charge-changing cross sections (2014)
  • Author(s): S. Terashima, I. Tanihata, R. Kanungo, A. Estrade, et al.,
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 101 Issue: 10 Pages: 1-7
  • DOI: 10.1093/ptep/ptu134
  • Peer Reviewed / Open Access
• [Journal Article] Evidence of halo structure in 37Mg observed via reaction cross sections and intruder orbitals beyond the island of inversion (2014)
  • Author(s): M. Takechi, S. Suzuki, D. Nishimura, M. Fukuda, T. Ohtsubo, M. Nagashima, T. Suzuki, T. Yamaguchi, A. Ozawa, T. Moriguchi, H. Ohishi, T. Sumikama, H. Geissel, N. Aoi, Rui-Jiu Chen, De-Qing Fang, N. Fukuda, S. Fukuoka, H. Furuki, N. Inabe et al.
  • Journal Title: Physical Review C Volume: 90 Issue: 6
  • DOI: 10.1103/physrevc.90.061305
  • Peer Reviewed / Open Access
• [Journal Article] 3α clustering in excited states of C16 (2014)
  • Author(s): Tomoaki Baba, Yohei Chiba, Masaaki Kimura
  • Journal Title: Phys. Rev. C Volume: 90 Issue: 6
  • DOI: 10.1103/physrevc.90.064319
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Superdeformed Λ hypernuclei with antisymmetrized molecular dynamics (2014)
  • Author(s): M.Isaka, K.Fukukawa, M.Kimura, E.Hiyama, H.Sagawa, Y.Yamamoto
  • Journal Title: Phys. Rev. C Volume: 89 Issue: 2 Pages: 1-8
  • DOI: 10.1103/physrevc.89.024310
  • Peer Reviewed
• [Presentation] 26Neピグミー共鳴の構造と崩壊モード (2016)
  • Author(s): 木村真明
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学, (宮城県仙台市)
  • Year and Date: 2016-03-19
• [Presentation] Nuclear response functions and clustering aspects studied by Antisymmetrized Molecular Dynamics (2015)
  • Author(s): M. Kimura
  • Organizer: High Spectroscopy & Tensor Interactions
  • Place of Presentation: 大阪大学, (大阪府大阪市)
  • Year and Date: 2015-11-16
  • Int'l Joint Research
• [Presentation] Exotic Nuclear Clustering near the Neutron Drip-Line Studied by Antisymmetrized Molecular Dynamics (2015)
  • Author(s): M. Kimura
  • Organizer: Gordon Research Conference Nuclear Chemisty
  • Place of Presentation: Colby-Sawyer College, New London(USA)
  • Year and Date: 2015-05-31
  • Int'l Joint Research / Invited
• [Presentation] Clusters in N=Z nuclei proved by isoscalar monopole transitions (2014)
  • Author(s): M. Kimura
  • Organizer: International Symposium on Physics of Unstable Nuclei 2014
  • Place of Presentation: New World Hotel, Ho Chi Minh City, Vietnam
  • Year and Date: 2014-11-03 – 2014-11-08
• [Presentation] Formation of clusters in stable and unstable nuclei explored by antisymmetrized molecular dynamics (2014)
  • Author(s): M. Kimura
  • Organizer: Fourth Joint Meeting of the Nuclear Physics Divisions of APS and JPS
  • Place of Presentation: Hilton Waikoloa Village, Big Island, Hawaii, USA
  • Year and Date: 2014-10-07 – 2014-10-11
  • Invited
• [Presentation] Erosion of N=28 Shell Gap and Triple Shape Coexistence in the vicinity of 44S (2014)
  • Author(s): M. Kimura
  • Organizer: The 2nd Conference on "Advances in Radioactive Isotope Science” (ARIS2014)
  • Place of Presentation: 東京大学, 東京都文京区
  • Year and Date: 2014-06-01 – 2014-06-06
• [Presentation] Clustering aspects in N=Z nucleus 24Mg studied by antisymmetized molecular dynamics (2014)
  • Author(s): M.Kimura
  • Organizer: 3rd International Workshops on “State of the Art of Cluster Physics" (SOTANCP3)
  • Place of Presentation: KGU関内メディアセンター, 神奈川県横浜市
  • Year and Date: 2014-05-26 – 2014-05-30
  • Invited
• [Presentation] Shape coexistence and non-yrast states in neutron-rich N～28 nuclei (2013)
  • Author(s): M. Kimura
  • Organizer: The 12th Asia Pacific Physics Conference (APPC12)
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
• [Presentation] 反対称化分子動力学によるDrip-line核の研究に向けて (2013)
  • Author(s): 木村真明
  • Organizer: 核子・ハイペロン多体系におけるクラスター現象
  • Place of Presentation: 関東学院大学(神奈川県横浜市)
• [Presentation] 中性子過剰N～28核における非軸対称変形と変形共存 (2013)
  • Author(s): 木村真明
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 高知大学(高知県高知市)
• [Funded Workshop] Hokkaido workshop on many nucleons correlations and clustering (2015)
  • Place of Presentation: 北海道大学(北海道札幌市)
  • Year and Date: 2015-08-27