High lying E0 strength in ¹²C

The excitation region in ¹²C from 7 MeV<E_x<60 MeV was studied with inelastic scattering of 240-MeV α particles at small angles including 0° where E0 strength is enhanced. The strengths of known 0⁺ states at E_x=7.655 MeV and E_x=10.3 MeV were obtained and E0 strength was observed to be distributed between E_x=14 MeV and E_x=30 MeV with a centroid of 21.5±0.4 MeV and an rms width of 3.1±0.2 MeV containing 14.5±4.0% of the isoscalar E0 energy-weighted sum rule. Angular distributions and strengths of the E_x=4.439 MeV 2⁺, 9.641 MeV 3^-, and 10.844 MeV 1^- states were also obtained.