Excitation of alpha cluster in light nuclei

2013 Fiscal Year Final Research Report

• Project/Area Number: 23540349
• 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: Konan University
• Principal Investigator: YAMAGATA Tamio 甲南大学, 理工学部, 教授 (50068144)
• Project Period (FY): 2011 – 2013
• Keywords: αクラスター / 媒質効果 / αクラスターの大きさ

Research Abstract

The giant dipole resonance (GDR) in 6Li was investigated via the 6Li(gamma,n) reaction.The GDR in 6Li was found to consist of two components at Ex= 15 MeV and 33 MeV. The component at Ex=15 MeV is seemed to be the intrinsic GDR in 6Li. The another one at Ex=33 MeV is due to the GDR of the alpha cluster in 6Li. Since the GDR in free 4He is known to locate at Ex= 27 MeV, the excitation energy of the GDR of the alpaha cluster in 6Li is much higher than that of the 4He. This fact suggests that the size of the alpha cluster in 6Li is smaller than that of 4He due to the nuclear medium effect.

Research Products

• [Journal Article] Photoneutron cross sections for Mo isotope : A step toward a unified understanding of ( γ , n) and (n, γ ) reactions (2013)
  • Author(s): H. Utsunomiya, S. Goriely, T. Kondo, C. Iwamoto, H. Akimune, T. Yamagata, H. Toyokawa, H. Harada, F. Kitatani, Y.-W. Lui, A.C. Larsen, M. Guttormsen, P.K. Koehler, S. Hilaire, S. Peru, M. Martini, and A.J. Koning
  • Journal Title: Phys. Rev Volume: C88 Pages: 015805-1-6
  • Peer Reviewed
• [Journal Article] Total and partial photoneutron cross sections for Pb isotopes (2012)
  • Author(s): T. Kondo, H. Utsunomiya, S. Goriely, I. Daoutidis, C. Iwamoto, H. Akimune, A. Okamoto, T. Yamagata, M. Kamata, O. Itoh, H. Toyokawa, Y.-W. Lui, H. Harada, F. Kitatani, S. Hilaire, and A.J. Koning
  • Journal Title: Phys. Rev Volume: C86 Pages: 014316-1-7
  • Peer Reviewed
• [Journal Article] Separation of pigmy dipole and M1 resonances in 90Zr by a high-resolution inelastic scattering near 0 degree (2012)
  • Author(s): C. Iwamoto, H. Utsunomiya, A. Tamii, H. Akimune, H. Nakada, T. Shima, T. Yamagata, et al
  • Journal Title: Phys. Rev. Lett Volume: 108 Pages: 262501-1-4
  • Peer Reviewed
• [Journal Article] Determination of pulsed laser Compton scattering photons (2011)
  • Author(s): T. Kondo H. Utsunomiya, H. Akimune, T. Yamagata, A. Okamoto, H. Harada, F. Kitatani, T. Shima, K. Horikawa, S. Miyamoto
  • Journal Title: Nucl. Instruments and Methods in Phys. Research Volume: A 659 Pages: 462-466
  • Peer Reviewed
• [Journal Article] Photoneutron cross sections for Au revisited:Measurements with laser Compton scattering γ-rays and data reduction by a least-squares method (2011)
  • Author(s): O. Itoh, H. Utsunomiya, H. Akimune, T. Kondo, M. Kamata, T. Yamagata, H. Toyokawa, H. Harada, F. Kitatani, S. Goko, C. Nair and Y-W. Lui
  • Journal Title: Journal of Nuclear Science and Technology Volume: Vol. 48, No. 5 Pages: 834-840
  • Peer Reviewed
• [Presentation] Medium effect in the photoexcitation of α cluster in 6Li (2014)
  • Author(s): T. Yamagata, et al
  • Organizer: International Workshop on Nuclear Physics and Gamma-ray Sources for Nuclear Security and Nonproliferation
  • Place of Presentation: Ricotti, Tokai-Mura, Japan
  • Year and Date: 2014-01-30
• [Presentation] 6Li(γ, n)反応によるαクラスター励起 (2013)
  • Author(s): 山県民穂, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 高知大学
  • Year and Date: 2013-09-26