对文章“超冷中子损失率的温度依赖性”的评论E.Korobkina等人，PRB 70，035409
Comment to the article "Temperature dependence of ultracold neutron loss rates" E.Korobkina et al., PRB 70,035409
摘要：
在工作[1]中（“超冷中子损失率的温度依赖性”E.Korobkina等人，本文介绍了在铜阱中超冷中子（UCN）贮存的4 ~ 300 K范围内，UCN损失随温度变化的测量结果。在解释实验数据时，人为地只考虑损失率之差1/τ（T）= 1/τ_exp（T）- 1/τ_exp（10 K），（τ- UCN在捕集器中的储存时间）。它已被接受的温度依赖性的损失变化从0到3.3*10-4每一个碰撞的UCN与陷阱表面。然而，对原始实验数据的分析表明，在温度为10 K的阱中，每次碰撞的损失为1.0*10-3。它们比所讨论的温度依赖性大得多（3倍），并且几乎比由于铜上的捕获截面引起的损失大10倍。这些损失最有可能与UCN通过陷阱快门的狭缝泄漏有关。温度从300 K变化到10 K时，a缝的尺寸变化25%，可以很好地解释所讨论的温度依赖性。当然，氢存在于表面上，但正如工作中所示[2]（V. P. Alfimenkov等人，JETP. Vol.55，No.2，1992年1月25日）在工作中，即使在未脱气的表面上，温度依赖性也比在脱气和氘代的表面上低3倍[1]。最后，陷阱表面的氘化几乎可以完全抑制与氢存在有关的温度依赖性[2]。工作[1]的结论是氢以膜的形式定域在表面上，而不是分布在表面物质中。这一结论与UCN功损失的能量依赖性测量结果相矛盾[2]。对工作[1]和工作[2]的更详细分析如下。
英文摘要：
In work [1] ("Temperature dependence of ultracold neutron loss rates" E.Korobkina et al., PRB 70,035409) results of measurement of temperature dependence of losses of ultracold neutrons (UCN) in a range from 4 K to 300 K at UCN storage in a copper trap are presented. At interpretation of experimental data it was artificially considered only the difference of losses rate 1/tau(T)= 1/tau_exp(T)- 1/tau_exp(10K), (tau - UCN storage time in the trap). It has been accepted for temperature dependence of losses which changes from 0 to 3.3*10-4 per one collision of UCN with a trap surface. However, the analysis of raw experimental data shows that in a trap at temperature 10 K there is losses 1.0*10-3 per collision. They are considerably (in 3 times) more than discussed temperature dependence and almost 10 times more than losses due to capture cross section on copper. It is the most probable that these losses are connected with leakage of UCN through a slit of trap shutter. Change of the size of a slits on 25% at change of temperature from 300K to 10K can quite explain discussed temperature dependence. Certainly, hydrogen is present on a surface, but as it was shown at work [2] (V.P.Alfimenkov et al., JETP., Vol. 55, No. 2 25 Jan.1992) temperature dependence in 3 times lower, even on the undegased surfaces than on the degassed and deuterated surface in work [1]. At last, deuteration of a trap surface allows almost completely to suppress temperature dependence connected with presence of hydrogen [2]. The conclusion of work [1] is that hydrogen is localized on a surface in the form of a film, instead of distribution in the surface substance. This conclusion contradicts results of measurement of energy dependence of UCN losses in work [2]. More detailed analysis of work [1] and works [2] is presented below.
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