Shell evolution towards doubly-magic 78Ni studied by the beta-gamma spectroscopy

• Project/Area Number: 25800130
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: NIIKURA Megumi 東京大学, 理学(系)研究科(研究院), 助教 (50644720)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 実験原子核物理 / 原子核構造 / ベータ崩壊 / ガンマ線核分光

Outline of Final Research Achievements

Spectroscopic studies were carried out on neutron-rich Zn isotopes to explore the single-particle structure of the most neutron-rich doubly-magic nucleus, Ni-78. The experiment was performed at RI Beam Factory (RIBF) in RIKEN using two different method: beta-gamma spectroscopy and in-beam gamma-ray spectroscopy. Excited level schemes of Zn-79,80,81 were constructed for the first time. From the different selectivity of the decay/reaction, single-particle states are identified and the shell-evolution of this neutron-rich nuclei were discussed.

Research Products

• [Journal Article] β-Decay Half-Lives of 76, 77Co, 79, 80Ni and 81Cu Experimental Indication of a Doubly Magic 78Ni (2014)
  • Author(s): Z.Y. Xu, S. Nishimura, G. Lorusso, F. Browne, P. Doornenbal, G. Gey, H.-S. Jung, Z. Li, M. Niikura, P.-A. Soderstrom, T. Sumikama, J. Taprogge, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, H. Baba, S. Franchoo, H. Nishibata 他
  • Journal Title: Phys. Rev. Lett. Volume: 113 Issue: 3 Pages: 032505-032505
  • DOI: 10.1103/physrevlett.113.032505
  • Peer Reviewed / Open Access
• [Journal Article] Systematic study of β-decay half-lives in the vicinity of 78Ni (2013)
  • Author(s): Z. Y. Xu et al.
  • Journal Title: JPS Conf. proc Volume: 1
  • DOI: 10.7566/jpscp.1.013035
  • Peer Reviewed
• [Presentation] Structure of neutron- rich Zn isotope (2014)
  • Author(s): Megumi Niikura
  • Organizer: APS-JPS Joint meeting (HAW14)
  • Place of Presentation: Waikoloa, Hawaii (USA)
  • Year and Date: 2014-10-07 – 2014-10-11
• [Presentation] Neutron monopole drift towards 78Ni (2014)
  • Author(s): Megumi Niikura
  • Organizer: 3rd SUNFLOWER workshop
  • Place of Presentation: the University of Tokyo, Tokyo, Japan
  • Year and Date: 2014-09-15 – 2014-09-16
• [Presentation] Study on neutron-rich Zn isotopes via β-γ spectroscopy (2014)
  • Author(s): Megumi Niikura
  • Organizer: 2nd ARIS Conference
  • Place of Presentation: the University of Tokyo, Tokyo, Japan
  • Year and Date: 2014-06-01 – 2014-06-06
• [Presentation] Shell-evolution towards 78Ni (2014)
  • Author(s): Megumi Niikura
  • Organizer: 3rd EURICA workshop
  • Place of Presentation: RIKEN Nishina Center, Wako, Saitama, Japan
  • Year and Date: 2014-04-10 – 2014-04-11
• [Presentation] beta-decay spectroscopy at RIBF (2014)
  • Author(s): 新倉潤
  • Organizer: 7th SSRI workshop
  • Place of Presentation: 理化学研究所（埼玉県）
• [Presentation] Study on neutron-rich Zn isotopes via beta-gamma spectroscopy (2014)
  • Author(s): M. Niikura
  • Organizer: 2nd ARIS conference
  • Place of Presentation: 東京大学（東京都）
• [Presentation] Study of proton shell evolution towards 78Ni (2013)
  • Author(s): M. Niikura
  • Organizer: SUNFLOWER workshop
  • Place of Presentation: Darmstadt, Germany
• [Presentation] Beta-decay spectroscopy in the vicinity of 78Ni (2013)
  • Author(s): M. Niikura
  • Organizer: LIA symposium
  • Place of Presentation: Paris, France
• [Presentation] ベータガンマ核分光による中性子過剰な78Ni近傍核の構造研究 (2013)
  • Author(s): 新倉潤
  • Organizer: 日本物理学会 秋季大会
  • Place of Presentation: 高知大学（高知県）