The Angular Distribution of the Photo-Neutrons from Beryllium

Abstract

The angular distribution of the photo-neutrons from beryllium has been studied for $\gamma$-ray energies of 1.70, 1.81, and 2.76 Mev. The distribution was found to be spherically symmetrical for the 1.70- and 1.81-Mev $\gamma$-rays. The 2.76-Mev gamma-ray yields a distribution of the form $a+b{sin}^2\theta$ with $\frac{a}{b}=1.2\mathrm{}$.