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arXiv · 1803.06370

First Calorimetric Measurement of Electron Capture in ${}^{193}$Pt with a Transition Edge Sensor

Katrina E. Koehler·Michael A. Famiano·Chris J. Fontes·Thomas W. Gorczyca·Michael W. Rabin·Dan R. Schmidt·Joel N. Ullom·Mark P. Croce
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Abstract

The neutrino mass can be extracted from a high statistics, high resolution calorimetric spectrum of electron capture in ${}^{163}$Ho. In order to better understand the shape of the calorimetric electron capture spectrum, a second isotope was measured with a close to ideal absorber-source configuration. ${}^{193}$Pt was created by irradiating a ${}^{192}$Pt-enriched platinum foil in a nuclear reactor. This Pt-in-Pt absorber was designed to have a nearly ideal absorber-source configuration. The measured ${}^{193}$Pt calorimetric electron-capture spectrum provides an independent check on the corresponding theoretical calculations, which have thus far been compared only for ${}^{163}$Ho. The first experimental and theoretically-calculated spectra from this ${}^{193}$Pt-in-Pt absorber are presented and overlaid for preliminary comparison of theory with experiment.

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Katrina E. Koehler, Michael A. Famiano, Chris J. Fontes, Thomas W. Gorczyca, Michael W. Rabin, Dan R. Schmidt, Joel N. Ullom, Mark P. Croce. 2018-03-16. First Calorimetric Measurement of Electron Capture in ${}^{193}$Pt with a Transition Edge Sensor. https://doi.org/10.1007/s10909-018-1984-2

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