Abstract
The neutron spectrum of a 1-kg Pu laboratory neutron source was measured by use of nuclear track emulsion and a differentiation technique. The spectrum consists of a minor peak at 0.91 MeV and a major one at 1.55 MeV. The mean energy was found to be 1.35 MeV and the maximum energy 2.8 MeV. Special analysis of the track distribution revealed peaks at 0.91, 1.26, 1.44, 1.64, 1.8, and 2.1 MeV, and weaker ones at 0.5 and 2.5 MeV. The measured spectrum does not differ in principal features from an analytical spectrum obtained by a graphico-numerical study of published thin-target measurements. The analytical study predicts the effects on -source spectra when emitters of different energy from are employed, and permits an interpretation of some previously unexplained observations by Chadwick and Constable.
- Received 28 December 1967
DOI:https://doi.org/10.1103/PhysRev.171.1311
©1968 American Physical Society