Non-Dispersive Measurement of the Transverse Coherence Length of a Cold Neutron Beam
Non-Dispersive Measurement of the Transverse Coherence Length of a Cold Neutron Beam
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冷中子束横向相干长度的非色散测量
DOI：
10.1143/jpsj.72.3079
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发表时间：
2003
影响因子：
1.7
通讯作者：
H. Shimizu
中科院分区：
文献类型：
--
作者：
M. Kitaguchi;H. Funahashi;T. Nakura;K. Taketani;M. Hino;Y. Otake;H. Shimizu
利用Jamin型冷中子自旋干涉仪测量了冷中子束的横向相干长度。它可以控制叠加的两个光路之间的横向位移，而不会产生色散。我们清楚地观察到，干涉条纹的对比度随光束准直所决定的相干函数而变化。测量的相干长度与用中子横动量分布的标准差估计的一致。
We have measured the transverse coherence length of a cold neutron beam using Jamin-type cold neutron spin interferometer. It can control the transverse shift between the superposed two paths with no dispersion. We have observed clearly that the contrast of interference fringes varies according to the coherence function determined by the collimation of the beam. The measured coherence length was consistent with the estimate by the standard deviation of the neutron transverse momentum distribution.