Ultracold-neutron production in a pulsed-neutron beam line

A note on the ultracold neutron production by neutron deceleration on clusters in liquid helium

An evaluation of slow neutron deceleration through their interaction with nanoclusters in liquid helium is performed. It is shown that this process is strongly suppressed if clusters are bound by the van der Waals interaction. PACS: 28.20.-v; 25.40.Fq; 36.40.C; 63.22.Kn

New Pulsed Cold Neutron Beam Line for Fundamental Nuclear Physics at LANSCE

The NPDGamma collaboration has completed the construction of a pulsed cold neutron beam line on flight path12 at the Los Alamos Neutron Science Center (LANSCE). We describe the new beam line and characteristics of the beam. We report results of the moderator brightness and the guide performance measurements. FP12 has the highest pulsed cold neutron intensity for nuclear physics in the world.

A Novel Neutron Dosimeter

Background: Neutron contamination in our environment can cause harmful biological effects on human body. Therefore, many efforts have been made to construct a neutron dosimeter to estimate the received dose. Objective: To design a simple neutron dosimeter. Methods: The primary dosimeter had 3He as a spherical thermal neutron detector encircled by paraffin 10 cm in radius. Then, the paraffin sph...

Neutron lifetime measured with stored ultracold neutrons.

Ultracold neutron upscattering rates in a molecular deuterium crystal

A calculation of ultracold neutron ~UCN! upscattering rates in molecular deuterium solids has been carried out, taking into account intramolecular excitations and phonons. The different molecular species ortho-D2 ~with even rotational quantum number J! and para-D2 ~with odd J! exhibit significantly different UCN-phonon annihilation cross sections. Parato ortho-D2 conversion, furthermore, couple...