Abstract
Various techniques have been applied to the measurement of weak gamma-ray decay modes of the 4.97-MeV 2− and 7.02-MeV 4− states in 20Ne excited by the reaction 12C(12C, αγ)20Ne. The M2 decay of the 4.97-MeV state to the ground state is 0.6 ± 0.2% of the total level width, corresponding to an M2 width of 2 × 10−3 Weisskopf units. The M2–E3 transition from the 7.02-MeV state to the 1.63-MeV 2+ state is 0.5% ± 0.2% of the level width; if all M2, this would correspond to an inhibition of 1.4 × 10−2 Weisskopf units, if all E3, to an enhancement of 6 Weisskopf units. The reliability of the measurements has been checked by angular correlation measurements of the weak transitions.
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