Investigation of Nuclear Energy Levels in Sulfur

Abstract

The total cross section of sulfur has been measured for neutrons of energies from 15 to 1450 kev with energy spreads between 1.5 and 9 kev. Below 750 kev, nine well-defined maxima are observed, three of which are interpreted as caused by $s$-neutrons; the others are believed to be produced by $p$- or $d$-neutrons. The $s$-resonances have natural widths of about 15 kev, while one of the other resonances which was studied in detail has a width of 1.5 kev. In the case of the latter resonance, the compound nucleus appears to be formed with spin of $\frac{3}{2}$. Above 750 kev neutron energy the density of observed levels increases, and no interpretation of the resonances was attempted.