Fig. 6: Excitation energy spectra from the multi-α events.
Excitation energy spectra of a 8Be from 2-α and b 12C from 3-α coincident detection. Each spectrum is fitted by the sum (red-solid line) of several resonance peaks (green-dotted lines) and a smooth background (blue-dashed line). The vertical red-dashed lines in (a) and (b) stand for the 2-α and 3-α decay thresholds of 8Be (−91.8 keV) and 12C (7.27 MeV), respectively. Arrows indicate the position of known states. The error bars are not displayed as they are smaller in size compared to the data points, which is attributed to the high statistics within each bin.
