Deduced γ transitionThe reactions 10 B( 3 He, pααα) at 4.9 MeV and 11 B( 3 He, dααα) at 8.5 MeV have been used to investigate the γ decay of states in 12 C. By measuring the four-body final state in complete kinematics we are able to detect γ transitions indirectly. We find γ transitions from the 15.11 MeV state in 12 C to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three α particles. The relative γ -ray branching ratios obtained are (1.2 ± 0.3), (0.32 ± 0.12), (1.4 ± 0.2) and (4.4 ± 0.8)%, respectively, with the remaining (92.7 ± 1.0)% of the γ decays going to the bound states. We obtain Γ α /Γ = (2.8 ± 1.2)% for the isospinforbidden α decay of the 15.11 MeV state. From the 12.71 MeV state we find γ transitions to the 10.3 and 7.65 MeV states. The relative γ -ray branching ratios are (0.9 +0.6 −0.5 ) and (2.6 +1.6 −1.2 )%, respectively, with the remaining (96.6 +1.7 −1.3 )% of the γ decays going to the bound states. Finally, we discuss the relation between the β decay of 12 N and 12 B to states in 12 C and the γ decay of the 15.11 MeV analog in 12 C to the same states.