We report the identification of metastable isomeric states of
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Abstract Ac at 6.28 keV, 6.67 keV and 20.19 keV, with lifetimes of an order of 100 ns. These states are produced by the$$^{228}$$ -decay of$$\beta $$ Ra, a component of the$$^{228}$$ Th decay chain, with$$^{232}$$ Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of$$\beta $$ Ra as well as the relative abundance of$$^{228}$$ Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.$$^{232}$$ -
Free, publicly-accessible full text available March 1, 2023
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Free, publicly-accessible full text available March 1, 2023
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A bstract The MicroBooNE liquid argon time projection chamber located at Fermilab is a neutrino experiment dedicated to the study of short-baseline oscillations, the measurements of neutrino cross sections in liquid argon, and to the research and development of this novel detector technology. Accurate and precise measurements of calorimetry are essential to the event reconstruction and are achieved by leveraging the TPC to measure deposited energy per unit length along the particle trajectory, with mm resolution. We describe the non-uniform calorimetric reconstruction performance in the detector, showing dependence on the angle of the particle trajectory. Such non-uniform reconstruction directly affectsmore »Free, publicly-accessible full text available December 1, 2022
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Free, publicly-accessible full text available October 1, 2022
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Free, publicly-accessible full text available September 1, 2022