https://doi.org/10.1140/epjc/s10052-019-6835-z
Regular Article - Experimental Physics
Temperature dependence of the probability of “small heating” and total losses of UCNs on the surface of Fomblin oils of different molecular mass
1
National Research Center Kurchatov Institute, 123182, Moscow, Russia
2
Joint Institute for Nuclear Research, 141980, Dubna, Russia
3
Institut Laue-Langevin, 38042, Grenoble, France
4
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Université, Collège de France, 75252, Paris, France
* e-mail: nesvizhevsky@ill.eu
Received:
25
February
2019
Accepted:
31
March
2019
Published online:
11
April
2019
We measured the temperature dependence of the probability of small heating and total losses of UCNs on the PFPE Fomblin Y surface with various molecular mass 
(2800, 3300, 6500 amu) in the temperature range of 100–300 K. The probability of small heating sharply decreases with increasing and decreasing temperature. The probability of total loss weakly decreases with decreasing temperature and takes the minimum value at 
. As this oil provides a homogeneous surface with minimal probabilities of small heating and total losses of UCNs, it is the preferred candidate for experiments on measuring the neutron lifetime.
© The Author(s), 2019
