The electron capture in  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   experiment (ECHo) is designed to directly measure the effective electron neutrino mass by analysing the endpoint region of the  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   electron capture spectrum. We present a data reduction scheme for the analysis of high statistics data acquired with the first phase of the ECHo experiment, ECHo-1k, to reliably infer the energy of  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   events and discard triggered noise or pile-up events. On a first level, the raw data is filtered purely based on the trigger time information of the acquired signals. On a second level, the time profile of each triggered event is analysed to identify the signals corresponding to a single energy deposition in the detector. We demonstrate that events not belonging to this category are discarded with an efficiency above 99.8%, with a minimal loss of  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   events of about 0.7%. While the filter using the trigger time information is completely energy independent, a slight energy dependence of the filter based on the time profile is precisely characterised. This data reduction protocol will be important to minimise systematic errors in the analysis of the  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   spectrum for the determination of the effective electron neutrino mass.

Germany

Robert Hammann

Arnulf Barth

Andreas Fleischmann

Dennis Schulz

Loredana Gastaldo

Data reduction for a calorimetrically measured  $$^{163}\mathrm {Ho}$$  <math> <mrow> <msup> <mrow></mrow> <mn>163</mn> </msup> <mi>Ho</mi> </mrow> </math>   spectrum of the ECHo-1k experiment