Relation between nuclear shape and beta-decay half life of neutron-rich Zr isotopes

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800117
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Institute of Physical and Chemical Research (2015-2016); Tohoku University (2014)
• Principal Investigator: Sumikama Toshiyuki 国立研究開発法人理化学研究所, 仁科加速器研究センター, チームリーダー (20392003)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: β崩壊 / 重元素合成

Outline of Final Research Achievements

The origin of elements heavier than iron in the solar system is considered to the nucleosynthesis in an environment where many neutrons exist such as a supernova explosion. In this process, very neutron-rich nuclei are produced via continuous neutron-capture reactions and beta decays. In this study, the beta decays were measured for the neutron-rich nuclei with the proton number 40 (Zr) and neighboring. The shape of nuclei, which is related to the beta decay half lives, was investigated. The deformation parameters for the Zr isotopes were successfully determined from the life time of the excited state, and the maximum deformation at the neutron number 64 was determined. New rotational bands in Mo isotopes were also observed, which are related to the detail of the deformed shape.

Free Research Field

原子核物理