Speaker
Description
The electron capture decay of 123-Te to 123-Sb is a second-order unique forbidden decay with a Q-value of 51.9 keV. It provides an excellent means to explore the limits of current theoretical models of electron capture at high daughter nucleus angular momentum and low Q-value. The Cryogenic Underground Observatory for Rare Events (CUORE) is a cryogenic calorimeter experiment located at Gran Sasso National Laboratory which uses natural TeO2 crystals allowing for the investigation of this rare electron capture due to the presence of 123-Te in the crystals. New analysis techniques have enabled the use of approximately 2 years of data with thresholds down to 3 keV for a total TeO2 exposure of 11.4 kg-yr. In this work, I present the first study with CUORE data of both the K- and L-shell captures in 123-Te. I present observations of peaks at 4.69 ± 0.03 keV and 30.6 ± 0.1 keV corresponding to the L1- and K-shell lines of Antimony (Sb). These lines can be produced in Tellurium electron captures and they have been found to have constant signal rates of 19.2 ± 1.0 counts per kg-day and 1.2 ± 0.1 counts per kg-day, respectively, in CUORE data.
