A perturbed angular distribution in 70Ga

A pulsed proton beam and coaxial Ge(Li) detector were used to study the time dependence of the angular distribution of γ-rays resulting from the decay of the 879 keV state in ⁷⁰Ga, as excited by the ⁷⁰Zn(p, n)⁷⁰Ga reaction. A strong time-dependent attenuation of anisotropy was observed. The unperturbed value of the angular distribution is consistent with the assignment of spin I = 4 to the 879 keV level. The half-life of the 879 keV state was measured to be $\text{T}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}\text{= 22.7 ± 0.5}\text{ns}$.