New Limits on Double Electron Capture of ⁴⁰Ca and ¹⁸⁰W

G. Angloher , M. Bauer , P. Bauer , I. Bavykina , A. Bento , C. Bucci , L. Canonica , C. Ciemniak

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X. Defay G. Deuter A. Erb F. v. Feilitzsch N. Ferreiro Iachellini P. Gorla A. G\"utlein D. Hauff P. Huff C. Isaila J. Jochum M. Kiefer M. Kimmerle H. Kluck H. Kraus J.-C. Lanfranchi J. Loebell A M\"unster C. Pagliarone F. Petricca S. Pfister W. Potzel F. Pr\"obst F. Reindl S. Roth K. Rottler C. Sailer K. Sch\"affner J. Schieck J. Schmaler S. Scholl S. Sch\"onert W. Seidel M. v. Sivers L. Stodolsky C. Strandhagen R. Strauss A. Tanzke V. Tretyak H. H. Trinh Thi C. T\"urko\u{g}lu M. Uffinger A. Ulrich I. Usherov S. Wawoczny M. Willers M. W\"ustrich A. Z\"oller

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classification ⚛️ nucl-ex physics.ins-det

keywords limitstimes10capturedoubleelectronv2ecanalyzedbest

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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.

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New Limits on Double Electron Capture of ⁴⁰Ca and ¹⁸⁰W

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