UCN anomalous losses and the UCN capture cross section on material defects

“ UCN anomalous losses and the UCN capture cross section on material defects ” by A .

Comment on the article " UCN anomalous losses and the UCN capture cross section on material defects " by A. Serebrov et al. Abstract We present correct solution of the problem about a scattering of the neutron on a point-like defect existing in a medium and show that this mechanism cannot explain anomalous losses of UCN in storage bottles. In a recent article by Serebrov et al. [1], a possible ...

UCN anomalous losses and the UCN capture cross-section on material defects

Experimental data shows anomalously large Ultra Cold Neutrons (UCN) reflection losses and that the process of UCN reflection is not completely coherent. UCN anomalous losses under reflection cannot be explained in the context of neutron optics calculations. UCN losses by means of incoherent scattering on material defects are considered and crosssection values calculated. The UCN capture cross-s...

Depolarization of UCN stored in material traps

Depolarization of ultra-cold neutrons (UCN) stored in material traps was "rst observed. The probability of UCN spin #ip per re#ection depends on the trap material and varies from 7]10~6 (beryllium) to 10~4 (glass). ( 2000 Elsevier Science B.V. All rights reserved.

A Silicon UCN Detector With Large Area and With Analysis of UCN Polarization

A silicon ultracold neutron (UCN) detector with an area of 45 cm(2) and with a (6)LiF converter is developed at St. Petersburg Nuclear Physics Institute (PNPI). The spectral efficiency of the silicon UCN detector was measured by means of a gravitational spectrometer at Institut Max von Laue - Paul Langevin (ILL). The sandwich-type detector from two silicon plates with a (6)LiF converter placed ...

Summary of the J-parc Ucn Taskforce