A prestorage method to measure neutron transmission of ultracold neutron guides

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.

Bi-spectral extraction through elliptic neutron guides

In this article we present the results of investigating a suggested guide extraction system utilizing both a thermal and a cold moderator at the same time, the so-called bi-spectral extraction. Here, the thermal moderator has line of sight to the sample position, and the neutrons from the cold source are reflected by a supermirror towards the sample. The work is motivated by the construction of...

Neutron velocity distribution from a superthermal solid 2 H 2 ultracold neutron source

We have determined for the first time the velocity distribution of neutrons from a solid H2 ultracold neutron (UCN) source. The spectrum rises sharply above 4.5m/s and has a maximum around 7m/s after transport in an 8m long guide. The number of neutrons in the UCN velocity range (< 7m/s) may be increased by a factor of two by placing the experiment 1m above the UCN source level. PACS. 29.25.Dz ...

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