A MEASUREMENT OF THE NUCLEAR MAGNETIC-MOMENT OF THE HE-3 ATOM IN TERMS OF THAT OF THE PROTON
A MEASUREMENT OF THE NUCLEAR MAGNETIC-MOMENT OF THE HE-3 ATOM IN TERMS OF THAT OF THE PROTON
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DOI：
10.1088/0026-1394/30/2/004
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发表时间：
1993-05-01
期刊：
影响因子：
2.4
通讯作者：
RICHARDS, MG
中科院分区：
文献类型：
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作者：
FLOWERS, JL;PETLEY, BW;RICHARDS, MG
我们已经测量了光泵低压氦-3和质子在水中的NMR自旋进动频率的比率，使用自由感应衰减。这是通过在精确球形的25 mm直径样品池中以0.1 T的通量密度直接替换样品来完成的，而不从磁体上移除样品池。将水测量值校正至25 ℃。这两组测量值分别参考10 mm直径的球形参考水样，并按比例计算。设计了一种新的方法来测量和校正由水中的阳离子和质子引起的磁场中剩余不均匀性的不同平均值。我们的最终结果是μ（h）（He-3）/μ（p）' =-0，7617861313（33）。使用CODATA 1986推荐的伽马（p）'值，伽马（h）/2 pi = 32，434 092 1（97）MHz T-1。将结果与γ（h）（He-3）/γ（p）（H-2）的测量结果相结合，得到H-2的屏蔽因子为sigma（H-2）= 26，350（19）x 10（-6），与理论值非常一致。将我们的结果与mu（p He-3）/mu（B）的测量结果相结合，得到mu（h）（He-3）/mu（B）=-1，158 671 471（14）× 10（-3）。
We have measured the ratio of the NMR spin precession frequencies of optically pumped low pressure helium-3 and of protons in water, using free induction decay. This was done by direct substitution in a flux density of 0,1 T of samples in an accurately spherical 25 mm diameter sample cell, without-removing the sample cell from the magnet. The water measurements were corrected to 25-degrees-C. The two sets of measurements were each referred to a 10 mm diameter spherical reference water sample which was ratioed out. A new method was devised to measure and correct for the different averaging of the residual inhomogeneities in the magnetic field by the helions and by the protons in the water. Our final result is mu(h) (He-3)/mu(p)' = -0,761 786 131 3(33). Using the CODATA 1986 recommended value for gamma(p)' gives gamma(h)/2pi = 32,434 092 1(97) MHz T-1. Combining the result with a measurement of gamma(h)(He-3)/gamma(p)(H-2) gives the shielding factor of H-2 as sigma(H-2) = 26,350(19) x 10(-6), in good agreement with a theoretical value. Combining our result with a measurement of mu(p)'/mu(B) yields mu(h)(He-3)/mu(B) = -1,158 671 471(14) x 10(-3).