Investigation of the reactions 31P(n, γ)32P and 32S(n, γ)33S

Abstract

The γ radiation following capture of thermal neutrons in 31P and 32S was investigated with scintillation-spectrometer techniques. Measurements of single and coincidence spectra and of γ-γ angular correlations yield the following spins in 32P: J(0.52) = 0, J(1.32) = (2), J(4.04) = 1, J(4.88) = 1, J(5.35) = 2 and J(5.78) = 1. The spins of the 1.15 and 3.26 MeV levels are confirmed to be 1 and 2, respectively. The γ-ray decay of some lower levels is determined too.

In the 33S nucleus a 1.44–7.20 MeV cascade is detected. The spin and parity of the intermediate level are 3+/2 or 5+/2. However, the existence of a level at about 1.4 MeV, expected on basis of a shell-model calculation, cannot be proved. In a sum-coincidence measurement a few other two-step cascades are detected.