Measurement of the Neutron Lifetime Using a Gravitational Trap and a Low-Temperature Fomblin Coating.

We present a new value for the neutron lifetime of 878.5 ± 0.7stat.

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).

Measurement of the Loss and Depolarization Probability of UCN on Beryllium and Diamond Like Carbon Films.

Currently several institutes worldwide are working on the development of a new generation of ultracold neutron (UCN) sources. In parallel with source development, new materials for guiding and storage of UCN are developed. Currently the best results have been achieved using (58)Ni, Be, solid O2 and low temperature Fomblin oil (LTF).

Superconducting UCN Polarizer for a New EDM Spectrometer.

A test experiment has shown that the number of ultracold neutrons (UCN) of one polarization state, transmitted through a 100 μm Al foil when placed in a 5 T magnetic field, is greater by 3.8 times. The increased transmission is due to the higher velocity of the UCN passing through the foil.