Deep-underground search for the decay of 180m-Ta with an ultra-low-background HPGe detector

R. Cerroni, S. Dell'Oro, A. Formicola +7

${}^{180m}$Ta is the longest-lived metastable state presently known. Its decay has not been observed yet. In this work, we report a new result on the decay of \mTa obtained with a $2…