Fluorescence of the 15⋅1 MeV level of 12 C

Abstract

The resonant scattering from the 15⋅1 MeV level in 12 C has been measured. The broad photon spectrum from the 7 Li ( p, γ ) 8 Be reaction was used as a source of 15⋅1 MeV radiation and the resonantly scattered γ -rays detected with a large NaI(TI) crystal. The quantity Γ γ 0 √Γ γ 0 √Γ was measured and found equal to (47⋅0 ± 6⋅0) eV. Combining this result with the branching ratios for the various modes of decay of the 15⋅1 MeV 12 C state, the value Γ γ 0 = (50⋅5 ± 7⋅1) eV for the ground-state transition was deduced.