STUDY OF NUCLEAR PHYSICS USING BRUTE FORCE LOW-TEMPERATURE NUCLEAR POLARIZATION

利用强力低温核极化研究核物理

基本信息

批准号：
09440102
负责人：
OHYA Susumu
金额：
$ 8.38万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Brute-force NMR-ON (BF-NMRON) is an attractive method for measuring g-factors without the knowledge of hyperfine interaction and hyperfine anomaly. The samples of ィイD175ィエD1SeFe, ィイD190ィエD1NbCu, ィイD190ィエD1NbNb, ィイD196ィエD1TcNb and ィイD1101mィエD1RhCu were prepared by recoil implantation into host metals (2μm) using 50MeV and 75MeV alpha- beams. Cooling down of the sample to low temperature about 10 mK was performed with a ィイD13ィエD1He/ィイD14ィエD1H dilution refrigerator. The vertical polarization field was provided by an NbィイD23ィエD2Sn superconducting solenoid with 12T maximum field at 4.2K. The manufacturer's computed homogeneity is 5x10ィイD1-4ィエD1 in 1 cm d.s.v. The hyperfine field of ィイD175ィエD1SeFe was determined to be 67.9(7)T by measuring the resonances at the external magnetic field of 0.2, 2 and 6T.We have succeeded in measuring BF-NMRON for ィイD190ィエD1NbCu, ィイD190ィエD1NbNb, ィイD196ィエD1TcNb and ィイD1101mィエD1RhCu. The resonance frequencies of ィイD190ィエD1NbCu and ィイD190ィエD1NbNb at 12T are 56.448(2) MHz and 56.57(1) MHz, respectively. The resonance widths are 21(1) kHz and 49(3) kHz. The resonance frequency of ィイD1101mィエD1RhCu at 12T is 110.8775(3) MHz. The width is 17(1) kHz. The relaxation time was also measured. To measure the absolute value of the magnetic field and the linearity of the field strength vs. the electric current the resonances of the well-known ィイD1110mィエD1AgAg made by a reactor were measured at various external field between 12T and 2T. The resonance width at 12T is 26(2) kHz. With the known magnetic moments and the field correction the Knight shifts of ィイD190ィエD1NbCu, ィイD190ィエD1NbNb, ィイD196ィエD1TcNb and ィイD1101mィエD1RhCu were determined.

强力 NMR-ON (BF-NMRON) 是一种在不了解超精细相互作用和超精细异常的情况下测量 g 因子的有吸引力的方法，适用于 D175D1SeFe、D190D1NbCu、D190 D1NbNb、D196D1TcNb 和 D196D1TcNb 样品。 D1101D1RhCu 通过使用 50MeV 和 75MeV α 光束反冲注入到主体金属 (2μm) 中制备，使用 D13He/D14 D1H 稀释制冷机将样品冷却至约 10 mK。 NbD23D2Sn 4.2K 时最大磁场为 12T 的超导螺线管。制造商计算出的均匀性为 1 cm d.s.v 中的 5x10D1-4D1。通过测量 0.2、2 和 2 的外部磁场下的共振，确定 D175D1SeFe 的超精细磁场为 67.9(7)T。 6T.我们已经成功测量D190D1NbCu、D190D1NbNb、D196D1TcNb 和 D1101mD1RhCu 的 BF-NMRON D190D1NbCu 和 D190D1NbNb 在 12T 时的共振频率为56.448(2) MHz 和 56.57(1) MHz 分别为 21(1) kHz 和 49(3) kHz。还测量了弛豫时间。磁性的场和场强与电流的线性在 12T 和 2T 之间的各种外部场下测量了由反应器产生的著名 D1AgAg 的谐振。12T 下的谐振宽度为 26(2 ) kHz。已知磁矩和场校正 D190D1NbCu 的奈特位移，测定了 D190D1NbNb、D196D1TcNb 和 D1101D1RhCu。