Monte Carlo evaluation of the muon-induced background in the GERDA double beta decay experiment

Pandola, L.; Bauer, M.; Kroeninger, K.; Liu, X.; Tomei, C.; Belogurov, S.; Franco, D.; Klimenko, A.; Knapp, M.

doi:10.1016/j.nima.2006.10.103

Cited by 40 publications

(39 citation statements)

References 36 publications

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“…Because these backgrounds depend strongly on an experimental design, as reported in Refs. [28,29], we quantitatively tested the effects of the neutron and muon-induced backgrounds by configuring different shielding layers with the active Veto system. We studied the shielding effects with various thicknesses of lead in configuration 1 and found that it is good enough to shield muon-induced gamma rays with even a 10-cmthick lead layer for the AMoRE-II experiment.…”

Section: Resultsmentioning

confidence: 99%

Neutron and muon-induced background studies for the AMoRE double-beta decay experiment

Bae

Jeon

Kim

et al. 2020

Astroparticle Physics

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AMoRE (Advanced Mo-based Rare process Experiment) is an experiment to search a neutrinoless double-beta decay of 100 Mo in molybdate crystals. The neutron and muon-induced backgrounds are crucial to obtain the zero-background level (<10 −5 counts/(keV·kg·yr)) for the AMoRE-II experiment, which is the second phase of the AMoRE project, planned to run at YEMI underground laboratory. To evaluate the effects of neutron and muon-induced backgrounds, we performed Geant4 Monte Carlo simulations and studied a shielding strategy for the AMORE-II experiment. Neutroninduced backgrounds were also included in the study. In this paper, we estimated the background level in the presence of possible shielding structures, which meet the background requirement for the AMoRE-II experiment.

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Section: Resultsmentioning

confidence: 99%

Neutron and muon-induced background studies for the AMoRE double-beta decay experiment

Bae

Jeon

Kim

et al. 2020

Astroparticle Physics

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“…4. The interruptions were due to the test and −0.004 , reducing the contribution of the muons to the BI to <10 −3 cts/(keV kg yr) [15]. No evidence for delayed coincidences between μ veto events and germanium events was found.…”

Section: Run Parameters and Efficienciesmentioning

confidence: 90%

“…3.1) or that were known to be present in the vicinity of the detectors (see Table 2) were simulated using the MaGe code [22] based on Geant4 [23,24]. The expected BIs due to the neutron and muon fluxes at the LNGS underground laboratory have been estimated to be of the order 10 −5 cts/(keV kg yr) [25] and 10 −4 cts/(keV kg yr) [15] in earlier works. These contributions were not considered in this analysis.…”

Section: Background Sources and Their Simulationmentioning

confidence: 99%

The background in the $$0\nu \beta \beta $$ 0 ν β β experiment Gerda

et al. 2014

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The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta (0νββ) decay of 76 Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q ββ value of the decay. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Q ββ . The main parameters needed for the 0νββ analysis are described. A background model was devel- oped to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Q ββ with a background index ranging from 17.6 to 23.8 × 10 −3 cts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Q ββ is dominated by close sources, mainly due to 42 K, 214 Bi, 228 Th, 60 Co and α emitting isotopes from the 226 Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known γ peaks, the energy spectrum can be fitted in an energy range of 200 keV around Q ββ with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.

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“…In particular, the neutron background rate can be reduced down to a few events/tonne/year for direct dark matter experiments (corresponding to a potential cross-section sensitivity of 10 −10 pb to spin-independent WIMP-nucleon interactions) [25] and to 10 −3 events/(keV kg year) for neutrinoless ββ decay experiments [32].…”

Section: Background Suppression Strategiesmentioning

confidence: 99%

Neutron- and muon-induced background in underground physics experiments

2008

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Abstract. Background induced by neutrons in deep underground laboratories is a critical issue for all experiments looking for rare events, such as dark matter interactions or neutrinoless ββ decay. Neutrons can be produced either by natural radioactivity, via spontaneous fission or (α,n) reactions, or by interactions initiated by high-energy cosmic rays. In all underground experiments, Monte Carlo simulations of neutron background play a crucial role for the evaluation of the total background rate and for the optimization of rejection strategies. The Monte Carlo methods that are commonly employed to evaluate neutron-induced background and to optimize the experimental setup, are reviewed and discussed. Focus is given to the issue of reliability of Monte Carlo background estimates. PACS

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Monte Carlo evaluation of the muon-induced background in the GERDA double beta decay experiment

Cited by 40 publications

References 36 publications

Neutron and muon-induced background studies for the AMoRE double-beta decay experiment

Neutron and muon-induced background studies for the AMoRE double-beta decay experiment

The background in the $$0\nu \beta \beta $$ 0 ν β β experiment Gerda

Neutron- and muon-induced background in underground physics experiments

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