New Limits on Double Electron Capture of $^{40}$Ca and $^{180}$W
  We analyzed low-background data from the CRESST-II experiment with a total net exposure of 730 kg days to extract limits on double electron capture processes. We established new limits for $^{40}$Ca with $T_{1/2}^{2v2K}>9.9\times10^{21}$ y and $T_{1/2}^{0v2EC}>1.4\times10^{22}$ y and for $^{180}$W with T$_{1/2}^{2v2K}>3.1\times10^{19}$ y and $T_{1/2}^{0v2EC}>9.4\times10^{18}$ y at 90% CL. Depending on the process, these values improve the currently best limits by a factor of $\sim$1.4-30. 
G. Angloher, M. Bauer, P. Bauer, I. Bavykina, A. Bento, C. Bucci, L.   Canonica, C. Ciemniak, X. Defay, G. Deuter, A. Erb, F...
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