# Neutrino 2018 - XXVIII International Conference on Neutrino Physics and Astrophysics

4-9 June 2018
Heidelberg
Europe/Berlin timezone
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# Contribution Poster direct neutrino mass

Poster (not participating in poster prize competition)

# Backgrounds in the ECHo-experiment

## Speakers

• Mr. Alexander ZIEGENBEIN

## Authorship annotation

for the ECHo collaboration

## Session and Location

Monday Session, Poster Wall #18 (Robert-Schumann-Room)

## Abstract content

The absolute neutrino mass $m_{\nu_{e}}$ determination is still an open question in particle physics. The ECHo experiment will explore the endpoint of the $^{163}Ho$ electron capture spectrum which offers great potential to reach sub-eV sensitivity on $m_{\nu_{e}}$. In order to better identify signatures of massive neutrinos, the control of background near the spectrums endpoint is of utmost importance. We show results obtained using Monte Carlo simulation in which common natural occurring radioactive nuclides have been positioned either in the detector itself or in its surrounding. Thereby, upper values allowed for the activity of these nuclides have been determined. Potential background caused by radionuclides in the set-up has been investigated by material screening. Hence, we confirm that the requiered background index can be achieved. We outline the status of the background determination related to cosmic muons and how it is planned to reduce the effect of this background source.

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