Experimental search for the lowest T=2 state in 12C via isospin forbidden reactions

Isospin forbidden resonance reactions were studied to locate the lowest T=2 state in 12C. Charged particle reactions and gamma-ray work is described in detail. Decay of the lowest T=2 state in 12C to 16.6 and 16.9 Mev levels of 8Be has been studied for the first time. No resonance was observed in these reactions in the investigation over Barnes' range. A higher exitation energy range was also covered besides Barnes' range, both via charged particles and gamma-ray reaction. All the results in this higher excitation energy range were negative. Upper limits calculated for the resonance strength was found to be less than half of the previously reported value. (author)