Investigation of the reaction 35Cl(τ, α)34Cl at Eτ = 15 MeV

Abstract

The 35Cl(τ, α)34C reaction has been used to study the properties of 34Cl levels up to an excitation energy of 5 MeV. Angular distributions of 37 levels were measured with a split-pole magnetic spectrograph, at a bombarding energy of 15 MeV. New levels have been found at 3847, 3964, 4206, 4321 and 4715 keV, all ± 10 keV. There is a strongly excited multiplet at Ex = 5.0 MeV with components at 4939 ± 11, 4958 ± 11, 4971 ± 11, 4998 ± 12 and 5010 ± 13 keV. A DWBA analysis of the α-particle angular distributions yielded ln values and spectroscopic factors. New spin and parity assignments were obtained. The T = 1 character of the levels at Ex = 4.21 and 4.72 MeV has been determined. Experimental spectroscopic factors are compared with results from recent many-particle shell-model calculations.