Energy levels of 38Ar from the 37Cl(p, α0)34S reaction

Abstract

The 37Cl(p, α0)34S reaction was investigated in the energy region Ep = 850–2000 keV; 130 resonances were observed. Resonance strengths and energies are reported. Angular distributions of α0 particles were measured at 77 resonances. The analysis allowed unique spin and parity assignments for 28 cases. In 32 cases, two different spin assignments were possible. Formation and population parameters were determined. Formation of the 1− resonance at 1591.8 keV and the 2+ resonance at 1860.6 keV proceeds purely through channel spin 1. The measured level density shows a good agreement with theoretical predictions. The isobaric analogues of the lowest two excited states of 38Cl were observed although the α0 decay is T-forbidden. The strength of the Jπ = 3− analogue state, split in several components, is in excellent agreement with the corresponding (d, p) strength, measured by Rapaport and Buechner.