在涂有液氦膜的阱中显著增加超冷中子贮存时间的可能性
On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film
摘要：
结果表明，超冷中子阱的粗糙内壁可以涂上一层比超冷中子穿透氦的深度厚得多的超流氦膜。这种涂层应该可以将阱壁吸收引起的超冷中子损失率降低几个数量级。结果表明，三角形粗糙度比矩形粗糙度更能有效地降低超冷中子的损失率。三角形粗糙度在技术上更容易实现，并且这种衍射光栅在工业上制造。还提出了其他方法来增加保护性氦膜的厚度。
英文摘要：
It is shown that rough inner walls of a trap of ultracold neutrons can be coated with a superfluid helium film much thicker than the depth of penetration of ultracold neutrons into helium. This coating should reduce the rate of loss of ultracold neutrons caused by absorption in the walls of the trap by orders of magnitude. It is demonstrated that triangular roughness is more efficient than rectangular for the reduction of the rate of loss of ultracold neutrons. Triangular roughness is more easily implemented technically and such diffraction gratings are fabricated industrially. Other methods are proposed to increase the thickness of the protective helium film.
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