Universal liquid-hydrogen source of polarized cold and ultracold neutrons at the WWER-M LIYaF reactor

Record values of polarized cold neutron flux density and intensity (3x1010 n x s-1 and 6x108 n x s-1 x cm-2), as well as ultracold neutron intensity (5x105 n x s-1) with 6x103 n x s-1 cm-2 flux density for Vx, Vy, VZ<7.8 m/s rate interval are obtained at a medium power reactor. The neutron beam polarization degree is 90±5%. Investigations into the ultracold and cold neutron yield for deuterium and hydrogen-deuterium mixtures are carried out