Measurement of the cosmogenic activation of germanium detectors in EDELWEISS-III

Understand

We present a measurement of the cosmogenic activation in the germanium cryogenic detectors of the EDELWEISS III direct dark matter search experiment.

• The decay rates measured in detectors with different exposures to cosmic rays above ground are converted into production rates of different isotopes.
• The measured production rates in units of nuclei/kg/day are 82 $\pm$ 21 for $^3$H, 2.8 $\pm$ 0.6 for $^{49}$V, 4.6 $\pm$ 0.7 for $^{55}$Fe, and 106 $\pm$ 13 for $^{65}$Zn.
• These results are the most accurate for these isotopes.