The gamma-decay of³⁴Ar

Abstract

States in³⁴Ar up to 5.5 MeV excitation energy, populated by the³²S(³He,nγ) reaction at 8–12 MeV bombarding energy, have been investigated with the Doppler shift attenuation method,nγ angular correlation andnγγ triple coincidence measurements. For the states at 2.09, 3.29 and 4.52 MeV the lifetimes 200±60 fs, 130±60 fs and 260±80 fs have been found, respectively. Thenγ correlations yielded the spin assignmentsJ ^μ=(2⁺) for the level at 4.13 MeV andJ ^μ=3⁻ for the 4.52 MeV state, and the mixing ratiosδ(3.29→2.09)=−0.12±0.05 andδ(4.13→3.29)=−0.52±0.15. The results are compared with shell model calculations and predictions from the weak coupling unified model.