Study of neutron-rich nuclei in "island of inversion" by nuclear physics and atomic physics

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03659
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: Odahara Atsuko 大阪大学, 理学研究科, 准教授 (30264013)
• Co-Investigator(Kenkyū-buntansha): 下田 正 大阪大学, 理学研究科, 教授 (70135656)
• Co-Investigator(Renkei-kenkyūsha): MATSUO Yukari 法政大学, 理工学部, 教授 (50231593) ; HATAKEYAMA Atsushi 東京農工大学, 工学部, 准教授 (70345073)
• Research Collaborator: LASSEN Jens TRIUMF, Laser Applications, Group Leader ; LEVY Phil TRIUMF, Resonant Ionization Laser Ion Source group, Senior Scientist ; PEARSON Matt TRIUMF, Laser Spectroscopy group, Senior Scientist
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: スピン偏極ビーム / 超微細構造 / 新奇レーザー分光法の開発 / 中性子過剰核 / 32Na / 32Mg / 魔法数20の消失 / スピン・パリティの決定

Outline of Final Research Achievements

The neutron-rich nuclei in "island of inversion" around N=20 have exotic structure, which is the disappearance of magic number 20 with deformed shape. We have systematically studied nuclear structure of these nuclei by our unique method which can exactly determine the spin-parity by the beta decay of spin-polarized nucleus. In order to produce high polarization, information of hyperfine structure is needed. We developed new laser spectroscopy method to determine hyperfine structure of atoms of neutron-rich nuclei with beam intensity of < 100 particles par second. By using this new method, not only hyperfine structure but also the nuclear structure of the ground state can be investigated. After developing the spin-polarized beam, we can study nuclear structure of the excited states in neutron-rich nuclei far from beta-stability line.

Free Research Field

実験原子核物理学