Measurement of the Coherent Neutron Scattering Length ofHe3by Reflection from a Quartz-Liquid-Helium Interface

Abstract

The real part of the bound-atom coherent neutron scattering length of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been measured by comparing the reflectivities of quartz-liquid-${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and quartz-liquid-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ interfaces and has been found to have the value (6.1 ± 0.6) × ${10}^{-13\mathrm{}}$ cm.