Establishment of the measurement technique of the permanent electric dipole moment on an electron with cooled radioactive atoms.

建立了冷却放射性原子电子上永久电偶极矩的测量技术。

• 批准号: 21244026
• 负责人: SAKEMI Yasuhiro
• 金额: $ 30.62万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21244026/
• 关键词: フランシウム; 冷却不安定原子; 時間反転対称性; 表面イオン化器; 超対称性; 電気双極子能率; 表面電離型イオン源; CP非保存

The search for the permanent electric dipole moment (EDM)of the elementary particle such as the electron is quite important to understand the evolution mechanism of the baryon asymmetry in the universe. In this research program, to study the mechanism of the CP violation with the high accuracy measurement of the electron EDM, we focus on the radioactive element of the francium (Fr), which has the largest enhancement factor of the electron EDM due to the relativistic effect. The new high intensity thermal ionizer with melting target was successfully developed to produce the Fr with the fusion reaction of the <18>^O and <197>^Au. The specifications such as the Fr extraction efficiency of about 35%and production yield with 10^6 Fr+/s well sufficient for the EDM search were achieved. We established the experimental techniques of the Fr production, neutralization, and trapping, which were essential for the EDM search.

寻找电子等基本粒子的永久电偶极矩（EDM）对于理解宇宙中重子不对称性的演化机制具有重要意义。在本研究项目中，为了利用电子EDM的高精度测量来研究CP违和的机理，我们重点研究了放射性元素钫（Fr），它由于相对论效应对电子EDM的增强因子最大。成功研制了新型高强度带熔点的热离子发生器，以<18>^O和<197>^Au的熔合反应生产Fr。结果表明，Fr萃取效率约为35%，生产产率为10^6 Fr+/s，足以满足电火花搜索的要求。我们建立了Fr产生、中和和捕获的实验技术，这对EDM搜索至关重要。

项目成果

Search for permanent electric dipole moment in Francium

寻找钫的永久电偶极矩

• 发表时间: 2011
• 作者: 小澤正直;F.Nakano;吉田英智
• 通讯作者: 吉田英智

Present status of search for EDM of Francium atom at CYRIC (招待講演)

CYRIC钫原子EDM研究现状（特邀报告）

• 发表时间: 2010
• 作者: Itoh;K.;Ogi;K.;Awaki;H.;Kosaka;T.;Yamamoto;Y.;A. Shiomi;Masahiko Hayashi;Tohru Ozawa;吉田英智
• 通讯作者: 吉田英智

Radiation hardness of optoelectronic components for the optical readout of the ATLAS inner detector

用于 ATLAS 内部探测器光学读数的光电元件的辐射硬度

• DOI: 10.1016/j.nima.2010.04.098
• 发表时间: 2011
• 期刊: Nucl.Instrum.Meth.A
• 作者: S.Hou;K.Ishii;M.Itoh;Y.Sakemi;D.S.Su;T.T.Su;P.K.Teng;H.P.Yoshida
• 通讯作者: H.P.Yoshida

Development of the beam transport system for the study on atomic parity non conservation

原子宇称不守恒研究用束流传输系统的研制

• 发表时间: 2010
• 期刊: Proceedings of 4th International workshop on Fundamental Physics using Atoms
• 作者: A. Oikawa;M. Itoh;Y. Sakemi;et al
• 通讯作者: et al

レプトン双極子モーメントの測定

轻子偶极矩的测量

• 发表时间: 2011
• 作者: Nakano;F;K. Nakano;Tohru Ozawa;中村繁幸;酒見泰寛
• 通讯作者: 酒見泰寛