Cubic boron nitride: a new prospective material for ultracold neutron application

TL;DR

This study measures the neutron optical wall-potential of cubic boron nitride, demonstrating its potential as a coating material for ultracold neutron applications due to its high critical velocity and dielectric properties.

Contribution

First measurement of cubic boron nitride's neutron optical wall-potential using time-of-flight at an ultracold neutron source.

Findings

Wall-potential of (305 +/- 15) neV measured

Results agree with neutron reflectometry and theory

Cubic boron nitride shows promise for UCN applications

Abstract

For the first time, the neutron optical wall-potential of natural cubic boron nitride (cBN) was measured at the ultracold neutron (UCN) source of the research reactor TRIGA Mainz using the time-of-flight method (TOF). The samples investigated had a wall-potential of (305 +/- 15) neV. This value is in good agreement with the result extracted from neutron reflectometry data and theoretical expectations. Because of its high critical velocity for UCN and its good dielectric characteristics, cubic boron nitride coatings (isotopically enriched) will be useful for a number of applications in UCN experiments.