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26 April 2024 |
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The Performance of the Muon Veto of the GERDA Experiment | | K. Freund
; R. Falkenstein
; P. Grabmayr
; A.Hegai
; J.Jochum
; M. Knapp
; B. Lubsandorzhiev
; F. Ritter
; C. Schmitt
; A.-K. Schütz
; I. Jitnikov
; E. Shevchik
; M. Shirchenko
; D. Zinatulina
; | | Date: |
22 Jan 2016 | | Abstract: | Low background experiments need a suppression of cosmogenically induced
events. The GERDA experiment located at LNGS is searching for the neutrinless
double beta decay of $^{76}$Ge. It is equipped with an active muon veto the
main part of which is a water Cherenkov veto with 66 PMTs in the watertank
surrounding the GERDA cryostat. With this system 806 live days have been
recorded, 491 days were combined muon-germanium data. A muon detection
efficiency of $varepsilon_{mu d}=(99.935pm0.015)$ \% was found in a Monte
Carlo simulation for the muons depositing energy in the germanium detectors. By
examining coincident muon-germanium events a rejection efficiency of
$varepsilon_{mu r}=(99.2_{-0.4}^{+0.3})$ \% was found. Without veto condition
the muons by themselves would cause a background index of
$ extrm{BI}_{mu}=(3.16 pm 0.85) imes10^{-3}$ cts/(keV$cdot$kg$cdot$yr) at
$Q_{etaeta}$. | | Source: | arXiv, 1601.5935 | | Services: | Forum | Review | PDF | Favorites | |
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