Pygmy Dipole Resonances in Zr isotopes

• Project/Area Number: 25887036
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: IWAMOTO Chihiro 大阪大学, 核物理研究センター, 特任研究員 (50649770)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 実験核物理 / 実験核物理学

Outline of Final Research Achievements

Purpose of the study is to measure a Pygmy Dipole Resonances (PDRs) in Zirconium isotopes and to develop the new method to observe a structure of the PDR. The PDR is a new electric dipole resonances which have been found in recent years.

We have devepoled to measure the PDRs in Zirconium isotopes above 4MeV of excitation energy and we are performing an experiment to measure the PDR in Zrconium isotopes now. The PDRs in Zirconium isotopes is predicted to appear in the excitation energy range from 4MeV to 7MeV. In addition, we have estimated a background around an area in which we will set detectors for the measurement of the PDR structure and we have make a shield for the background and a vacuum chamber for targets.

Research Products

• [Journal Article] Low-energy electric dipole response in 120Sn (2015)
  • 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
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Study of radiation damage on Ge detectors and background for CAGRAF (2014)
  • Author(s): Natsumi Ichige
  • Organizer: 日本物理学会
  • Place of Presentation: Hilton Waikoloa Village Island of Hawaii, USA
  • Year and Date: 2014-10-07 – 2014-10-11
• [Presentation] 陽子非弾性散乱実験によるピグミー双極子共鳴の研究と中性子核物質研究への応用 (2014)
  • Author(s): 岩本 ちひろ
  • Organizer: 日本物理学会
  • Place of Presentation: 東海大学 湘南キャンパス
• [Presentation] Pygmy Dipole Resonance and Dipole Polarizability in 90Zr (2013)
  • Author(s): C. Iwamoto
  • Organizer: The 12th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG12)
  • Place of Presentation: International Congress Center EPOCHAL TSUKUBA (つくば国際会議場)