Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 63: Poster Session: Cryogenic Particle Detectors and Cryotechnique

TT 63.7: Poster

Donnerstag, 4. April 2019, 15:00–18:30, Poster D

Measurement of low energy electron capture spectra to test the impact of high order processes — •Tobias Schmitt¹ and Martin Brass for the ECHo-Collaboration² — ¹Kirchhoff-Institute of Physics, Heidelberg University, Germany — ²Institute of Theoretical Physics, Heidelberg University, Germany.

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 on the order of 5 percent of the total spectrum. Nowadays, the best description of the ¹⁶³Ho spectrum is obtained using ab-initio calculations for the capturing process of the electron. 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 low Q-value of 56 keV, which means ¹⁹³Pt can not undergo 1s-capture and the large atomic number it shares two important properties with ¹⁶³Ho. The larger energy interval will also provide more spectral lines for comparison with theories. At the same time it will provide a check that the theoretical description is not just fitted to the ¹⁶³Ho spectrum but indeed well understood. 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.