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Double electron capture searches in $^{74}$Se

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arxiv 1605.05976 v1 pith:F742WAKI submitted 2016-05-19 nucl-ex

B. Lehnert , T. Wester , D. Degering , D. Sommer , L. Wagner , K. Zuber This is my paper
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keywords beencapturedoubleelectronobtainedbackgroundcdotconcerns
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abstract

A search for various double electron capture modes of $^{74}$Se has been performed using an ultralow background Ge-detector in the Felsenkeller laboratory, Germany. Especially for the potentially resonant transition into the 1204.2 keV excited state of $^{74}$Ge a lower half-life limit of $0.70\cdot 10^{19}$ yr (90% credibility) has been obtained. Serious concerns are raised about the validity of obtained $^{74}$Se limits in some recent publications.

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