Measurements of electromagnetic moments of 19N and 20N and spectroscopic studies of levels in daughter nucleus

19N和20N电磁矩的测量以及子核能级的光谱研究

• 批准号: 11640277
• 负责人: SHIMIZU Suguru
• 金额: $ 2.56万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640277/
• 关键词: unstable nucleus; neutron halo nucleus; magnetic moment; spin polarization; transfer of spin-polarized electron; laser optical pumping; Ti : Sapphire laser; beam-foil spectroscopy; β遅発中性子崩壊; 励起準位; 傾斜薄膜法; チタンサファイアレーザー

A versatile spin polarizer for radioactive nuclear beams is proposed for spectroscopic studies of exotic nuclei far from stability. The polarizer takes advantage of the polarized electron transfer process, as in the optically pumped polarized proton ion sources. This method is applicable for low energy beams with a wide variety of nuclear species. The feasibility of the polarizer has been experimentally investigated by using stable nuclear beams at the test stand of RCNP.The beams with 2+ charge were injected into the polarizer and the nuclear polarization of the 1+ charge ions was selectively measured. The polarization measurement was based on the method of beam-foil spectroscopy. The nuclear polarization was observed for 10 keV/amu 3He, 3.4 keV/amu 14N and 15N beams to be (3.89 +- 0.76) %, (3.04 +- 0.11) % and (1.32 +- 0.40) %, respectively with P (Rb) =70-80%. The transmission efficiency of the 14N beam, (2+ion → 1+ion) was found to be 〜 60%. The performance is very promising for practical applications.

提出了一种用于放射性核束的多功能自旋偏振器，用于远离稳定性的奇异核的光谱研究。偏振器利用极化电子转移过程，就像在光泵极化质子离子源中一样。这种方法适用于具有多种核物种的低能束流。在RCNP实验台上用稳定的核束对偏振器的可行性进行了实验研究，将带有2+电荷的束流注入到偏振器中，选择性地测量了1+电荷离子的核极化。偏振测量是基于束箔光谱的方法。测得10keV/amu3He、3.4keV/amu14N和15N束的核极化分别为(3.89±-0.76)%、(3.04±-0.11)%和(1.32+-0.40)%，P(Rb)=70-80%。14N束流(2+离子→1+离子)的传输效率约为60%。其性能具有很好的实际应用前景。

项目成果

T.Shimoda, 他: "A spin polarizer for radioactive nuclear beams by taking advantage of polarizaed electron transfer reactions"Proc.of 5^<th> Int.Conf.on Radioactive Nuclear Beams, (RNB2000), Nuclear Physics A.. (出版予定). (2001)

T. Shimoda 等人：“利用极化电子转移反应的放射性核束的自旋偏振器”Proc.of 5^<th>Int.Conf.on Radioactive Nuclear Beams，(RNB2000)，Nuclear Chemistry A。 .（（待出版）。（2001）

S.Shimizu, E.Doumoto, M.Yagi, M.Asai, M.Nakamura, Y.Hirayama, K.Horie, T.Shigematsu, H.Izumi, T.Shimoda and N.Takahashi: "Spin polarization of low energy radioactive nuclear beams by tilted-foil technique."Proc.of 5^<th> Int.Conf.on Radioactive Nuclear Be

S.Shimizu、E.Doumoto、M.Yagi、M.Asai、M.Nakamura、Y.Hirayama、K.Horie、T.Shigematsu、H.Izumi、T.Shimoda 和 N.Takahashi：“低能自旋极化

S.Shimizu, 他: "Spin polarization of low energy radioactive nuclear beams by tilted-foil technique"Proc.of 5^<th> Int.Conf.on Radioactive Nuclear Beams, (RNB2000), Nuclear Physics A. (出版予定). (2001)

S.Shimizu 等人：“通过倾斜箔技术实现低能放射性核束的自旋极化”Proc.of 5^<th> Int.Conf.on Radioactive Nuclear Beams，(RNB2000)，核物理 A.（至即将出版）（2001）

S. Shimizu et al.: "High Precision Polarimeter System for Atomic Polarization and Tilted-Foil Experiments with 1.7 KeV/amu 14N^+ Beam"Review of Scientific Instruments. (in press). (2000)

S. Shimizu 等人：“使用 1.7 KeV/amu 14N^ 光束进行原子偏振和倾斜箔实验的高精度旋光计系统”科学仪器评论。

S.Shimizu, 他: "High Precision Polarimeter System for Atomic Polarization and Tilted-Foil Experiments with 1.7 KeV/amu ^<14>N^+ Beam"Review of Scientific Instruments.. 71. 2045-2049 (2000)

S. Shimizu 等人：“使用 1.7 KeV/amu ^<14>N^+ 光束进行原子偏振和倾斜箔实验的高精度旋光计系统”科学仪器评论.. 71. 2045-2049 (2000)