Proton-Neutron Reactions and Thresholds

Abstract

Threshold proton energies for neutron emission have been determined carefully for ${\mathrm{Be}}^{9}$, ${\mathrm{B}}^{11}$, ${\mathrm{C}}^{13}$, ${\mathrm{O}}^{18}$, ${\mathrm{Cl}}^{37}$, ${\mathrm{K}}^{41}$, ${\mathrm{V}}^{51}$, ${\mathrm{Mn}}^{55}$. Thin target yield data up to about 4 Mev proton energy are reported for ${\mathrm{Be}}^{9}$, ${\mathrm{B}}^{11}$, ${\mathrm{O}}^{18}$, and ${\mathrm{K}}^{41}$. A summary of all reported $p\ensuremath{-}n$ thresholds for $Z\ensuremath{\le}25$ is included. Isobaric mass differences from $p\ensuremath{-}n$ measurements and from beta-ray end points are compared. Data concerning the suitability of various $p\ensuremath{-}n$ reactions as controlled energy neutron sources are included.