Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces
Measurement of spin-flip probabilities for ultracold neutrons interacting with nickel phosphorus coated surfaces
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超冷中子与镍磷涂层表面相互作用的自旋翻转概率的测量
DOI：
10.1016/j.nima.2016.04.098
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发表时间：
2015
影响因子：
1.4
通讯作者：
A. Young
中科院分区：
文献类型：
--
作者：
Z. Tang;E. Adamek;A. Brandt;N. Callahan;S. Clayton;S. Currie;T. Ito;M. Makela;Y. Masuda;C. Morris;R. Pattie;J. Ramsey;D. Salvat;A. Saunders;A. Young
我们测量了超冷中子与镍磷涂层表面相互作用的自旋翻转几率。对于50 μm厚的镍磷涂层，在SS=（3. 3− 5.6+ 1.8）× 10− 6。对于50 μm厚的镍磷涂层，自旋翻转概率为β NiP on Al=（3. 6− 5.9+ 2.1）× 10− 6。对于用作参考的铜波导，发现每次反弹的自旋翻转概率为β Cu=（6. 7− 2.5+ 5.0）× 10− 6。镍磷涂层表面的结果可以解释为上限，对于不锈钢上50 μm厚的镍磷涂层和铝上50 μ m厚的镍磷涂层，SS上的β NiP < 6.2× 10 − 6（90% CL）和Al上的β NiP < 7.0× 10− 6（90% CL）。当需要低成本、机械坚固且具有高费米势的非去极化UCN导向器时，镍磷涂层不锈钢或铝提供了一种解决方案。
We report a measurement of the spin-flip probabilities for ultracold neutrons interacting with surfaces coated with nickel phosphorus. For 50 μm thick nickel phosphorus coated on stainless steel, the spin-flip probability per bounce was found to be β NiP on SS=(3. 3− 5.6+ 1.8)× 10− 6. For 50 μm thick nickel phosphorus coated on aluminum, the spin-flip probability per bounce was found to be β NiP on Al=(3. 6− 5.9+ 2.1)× 10− 6. For the copper guide used as reference, the spin flip probability per bounce was found to be β Cu=(6. 7− 2.5+ 5.0)× 10− 6. The results on the nickel phosphorus-coated surfaces may be interpreted as upper limits, yielding β NiP on SS< 6.2× 10− 6 (90% CL) and β NiP on Al< 7.0× 10− 6 (90% CL) for 50 μm thick nickel phosphorus coated on stainless steel and 50 μm thick nickel phosphorus coated on aluminum, respectively. Nickel phosphorus coated stainless steel or aluminum provides a solution when low-cost, mechanically robust, and non-depolarizing UCN guides with a high Fermi potential are needed.