# 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 (participating in poster prize competition)

# First spectroscopic measurements of conversion electrons from the gaseous Kr-83m at the KATRIN experiment

## Speakers

• Dr. Martin SLEZÁK

## Authorship annotation

for the KATRIN collaboration

## Session and Location

Monday Session, Poster Wall #13 (Robert-Schumann-Room)

## Abstract content

The KATRIN experiment will perform a measurement of the effective electron antineutrino mass with an unprecedented sensitivity of 0.2 eV/c$^2$ (90 % C.L.). An essential calibration and systematic tool in all tritium $\beta$-decay measurements is the metastable isotope $^{83\mathrm{m}}$Kr. With its unique decay characteristics it provides monoenergetic conversion electrons of suitable energies and line widths. The short half-life of 1.83 h allows to introduce the isotope into the experimental apparatus without the risk of long-term contamination.

In this poster we present the first spectroscopic measurements of gaseous $^{83\mathrm{m}}$Kr electrons performed with the full beamline of KATRIN. The results demonstrate the high-resolution performance of the KATRIN spectrometer and the ability to observe a spatially distributed isotropic source of electrons, both required for the tritium $\beta$-spectrum measurement.

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