Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrinophysik V

T 8.4: Talk

Monday, March 19, 2018, 16:50–17:05, Z6 - HS 0.001

The ¹⁶³Ho electron capture spectrum — Loredana Gastaldo and •Martin Brass for the ECHo collaboration — Kirchhoff-Institut fuer Physik, Universitaet Heidelberg

The analysis of high statistics and high resolution calorimetrically measured ¹⁶³Ho electron capture spectra, obtained within the ECHo experiment, clearly indicated that a theory based on first order excited states could not describe the data at the few percent level. Several theoretical models have been developed by different groups in order to improve the agreement with the experimental results.In this talk, we discuss the proposed theories and compare them to the available data.

In experiments as ECHo, designed to investigate the electron neutrino mass in the sub-eV region by the analysis of the ¹⁶³Ho electron capture spectrum, the precise knowledge of the processes involved in the decay, and therefore, in turn, of the spectral shape, is extremely important for the reduction of systematic uncertainties. We present new experimental approaches addressed to gain more information on the electron capture process in ¹⁶³Ho as well as in other nuclides undergoing electron capture, characterized by a low energy available for the process, Q_EC. Our aim is to provide high resolution and high statistics electron capture spectra to theorists to test new models.