15N原子核共振反应及Pd中的氢剖析

用¹⁵N+ ¹H→¹²C+⁴He+4.43MeV(γ射线)的共振核反应测量超导体Pd H中氢的浓度与深度之间关系,是较精确的方法。因为 1)深度分辨率高;2)γ射线能透过低温和真空系统而易于探测;3)反应共振能量为6.385MeV,为孤立共振,共振宽度很窄(6keV),易于分开;4)有大的反应截面(0.45b),灵敏度高。本文讨论了这种方法的原理、实验装置和不同制备条件下Pd(H)超导体中氢分布、并与压力荷电样品的结果相比较,对氢在这类超导体中的行为提出一些新的不同的看法。 关键词：

15N NUCLEAR RESONANCE REACTION AND HYDROGEN PROFILE IN PALLADIUM

The ¹⁵N+ ¹H→¹²C+⁴He+4.43MeV(γ-ray) nuclear resonance reaction has been used to study the H concentration versus depth in Pd. It is a precise method because. (1) it has a high depth resolution (～50?); (2) γ-ray can be detected easily after penetrating low temperature and vacuum systems; (3)the isolated resonance has an energy of 6.385 -MeV with very narrow width (6-keV); (4) it has reaction cross section of 0.46 barn and high sensitivity. In this paper, the principle of the method, the experimental set-ups as well as hydrogen distribution in the superconducting Pd (H) prepared at different conditions are discussed. In comparison with the observations on the presure charged sample, some new ideas about the hydrogen behavior in this kind of superconductor are given.
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