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

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440102/
• 关键词: BRUTE FORCE; LOW-TEMPERATURE NUCLEAR ORIENTATION; NUCLEAR MAGNETIC RESONANCE; NUCLEAR MAGNETIC MOMENT; 核磁場共鳴

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.

蛮力核磁共振（BF-NMR-ON）是一种在不考虑超精细相互作用和超精细异常的情况下测量g因子的方法。用50 MeV和75 MeV的α束反冲注入2μm厚的基体金属，制备了Nd：YAG D175 Nd：YAG D1 SeFe，Nd：YAG D190 Nd：YAG D1 NbCu，Nd：YAG D190 Nd：YAG D1 NbNb，Nd：YAG D196 Nd：YAG D1 TcNb和Nd：YAG D1101 Nd：YAG D1 RhCu样品。用氦氖D13氦氖D1 He/氦氖D14氦氖D1 H稀释冰箱将样品冷却至约10 mK的低温。垂直极化场由4.2K时最大磁场为12 T的Nb_（13）D_（23）D_（23）Sn超导螺线管提供。在0.2T、2 T和6 T的外磁场下，测量了D175硒化D1 SeFe的共振场，确定其超精细场为67.9（7）T。我们成功地测量了D190硒化D1 NbCu，D190硒化D1 NbNb，1960 ~ 1101 m锝D1 RhCu。在12 T下，Nd：YAG D190 Nd：YAG D1 NbCu和Nd：YAG D190 Nd：YAG D1 NbNb的共振频率分别为56.448（2）MHz和56.57（1）MHz。谐振宽度为21（1）kHz和49（3）kHz。在12 T下，超导体D1101 m超导体D1 RhCu的共振频率为110.8775（3）MHz。宽度为17（1）kHz。还测量了弛豫时间。为了测量磁场的绝对值和场强与电流的线性关系，在12 T和2 T之间的各种外场下测量了由反应器制成的公知的超导体D1110 m超导体D1 AgAg的共振。在12 T下的谐振宽度为26（2）kHz。在已知磁矩和磁场修正的情况下，测定了Nd：YAG D190 Nd：YAG D1 NbCu，Nd：YAG D190 Nd：YAG D1 NbNb，Nd：YAG D196 Nd：YAG D1 TcNb和Nd：YAG D1101 m Nd：YAG D1 RhCu的奈特位移。