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

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arxiv 1607.04560 v1 pith:MZJXMPTG submitted 2016-07-15 astro-ph.CO hep-exnucl-exphysics.ins-det

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

classification astro-ph.CO hep-exnucl-exphysics.ins-det
keywords detectorsproductionratesactivationcosmogenicdifferentgermaniumisotopes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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. A lower limit on the production rate of $^{68}$Ge of 74 nuclei/kg/day is also presented. They are compared to model predictions present in literature and to estimates calculated with the ACTIVIA code.

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