Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 80: Neutrinophysik IV
T 80.7: Talk
Thursday, March 28, 2019, 17:35–17:50, S06
Measurement of low energy electron capture spectra to test the impact of high order processes — •Tobias Schmitt1, Christian Enss1, Andreas Fleischmann1, Loredana Gastaldo1, Sebastian Kempf1, Ulli Koester2, Federica Mantegazzini1, and Clemens Velte1 for the ECHo collaboration — 1Kirchhoff Institute for Physics, Heidelberg University. — 2Institut Laue-Langevin, Grenoble.
The neutrino mass can be determined by analyzing the shape of the endpoint region of electron capture spectra. The best candidate for this investigation is 163Ho due to its low Q-value. Recent measurements of high statistic 163Ho spectra, performed by the ECHo collaboration, showed, that available theories can not describe the spectral shape. The deviations are in the order of 5 percent of the total spectrum.
The best description of the 163Ho spectrum is nowadays obtained using methods developed for the calculation of core level spectroscopy. To be able to better understand the excitations in which a 163Dy atom can be left after an EC-process occurred in 163Ho, we decided to study the calorimetrically measured EC spectrum of 193Pt. With its relatively low Q-value of 56 keV and the large atomic number it shares two important properties with 163Ho. The analysis of the 193Pt spectrum will allow for testing theories developed for the description of the 163Ho spectrum both in the same energy range as well as for captures from the second shell. We will give a status report on the detector design, 193Pt enclosure and the completed experimental platform we developed with the goal to measure a 193Pt electron capture spectrum.