Current Status and Future Perspectives of the COBRA Experiment

Figure 4

Distribution of events in interaction depth and energy from 82.3 kg⋅days of low-background data. Two high energy regions on the cathode surface are identified as alpha contaminants. Three gamma lines (vertical) are also visible. The region below 400 keV is dominated by the 𝛽-decay of 113Cd (half-life 8×10¹⁵ years). At low depths well-understood detector distortions and reconstruction artifacts can be seen.