基于涂有“低温氟油”的手风琴式超冷中子存储容器的中子寿命实验
Neutron Lifetime Experiment Based on an Accordion-Like UCN Storage Volume Coated With "Low Temperature Fomblin".
作者信息
Yerozolimsky B, Steyerl A, Kwon O, Luschikov V, Strelkov A, Geltenbort P, Achiwa N, Pichlmaier A, Fierlinger P
机构信息
Harvard University, Cambridge, MA, USA.
University of Rhode Island, Kingston, RI, USA.
出版信息
J Res Natl Inst Stand Technol. 2005 Aug 1;110(4):351-6. doi: 10.6028/jres.110.052. Print 2005 Jul-Aug.
A new type of per-fluorinated polymer, "Low Temperature Fomblin," has been tested as a wall coating in an ultracold neutron (UCN) storage experiment using a gravitational storage system. The data show a UCN reflection loss coefficient η as low as ≈ 5 × 10(-6) in the temperature range 105 K to 150 K. We plan to use this oil in a new type of neutron lifetime measurement, where a bellows system ("accordion") enables to vary the trap size in a wide range while the total surface area and distribution of surface area over height remain constant. These unique characteristics, in combination with application of the scaling technique developed by W. Mampe et al. in 1989, ensure exact linearity for the extrapolation from inverse storage lifetimes to the inverse neutron lifetime. Linearity holds for any energy dependence of loss coefficient µ(E). Using the UCN source at the Institut Laue Langevin we expect to achieve a lifetime precision below ±1 s.
一种新型的全氟聚合物“低温福姆布林”，已在一个使用重力存储系统的超冷中子（UCN）存储实验中作为壁涂层进行了测试。数据显示，在105 K至150 K的温度范围内，UCN反射损失系数η低至≈5×10⁻⁶。我们计划在一种新型中子寿命测量中使用这种油，其中一个波纹管系统（“手风琴”）能够在很宽的范围内改变陷阱尺寸，而总表面积和表面积沿高度的分布保持不变。这些独特的特性，与W. 曼佩等人在1989年开发的缩放技术相结合，确保了从反向存储寿命外推到反向中子寿命的精确线性关系。对于损失系数µ（E）的任何能量依赖性，线性关系都成立。使用劳厄 - 朗之万研究所的UCN源我们预计能实现低于±1 s的寿命精度。
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