MaGe-a Geant4-Based Monte Carlo Application Framework for Low-Background Germanium Experiments

Boswell, M.; Chan, Y. D.; Detwiler, J. A.; Finnerty, P.; Henning, R.; Gehman, V. M.; Johnson, Rob; Jordan, David V.; Kazkaz, K.; Knapp, M.; Kroeninger, K.; Lenz, Daniel; Leviner, L. E.; Liu, Jing; Liu, Xiang; MacMullin, S.; Marino, M. G.; Mokhtarani, A.; Pandola, L.; Schubert, A.; Schubert, J.; Tomei, C.; Volynets, O.

doi:10.1109/tns.2011.2144619

Cited by 146 publications

(119 citation statements)

References 47 publications

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“…The spectral shapes of individual background contributions were obtained by using a detailed implementation of the experimental setup in the Monte Carlo (MC) simulation framework MaGe [45]. A Bayesian spectral fit of the measured energy spectrum with the simulated spectra was performed in an energy range from 570 keV up to the end of the dynamic range at 7500 keV.…”

Section: The Background Modelmentioning

confidence: 99%

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

Agostini¹,

Allardt²,

Bakalyarov³

et al. 2015

Eur. Phys. J. C

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A search for neutrinoless ββ decay processes accompanied with Majoron emission has been performed a e-mail: gerda-eb@mpi-hd.mpg.de using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with 123 416 Page 2 of 12 Eur. Phys. J. C (2015) 75 :416 spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10 23 yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with 76 Ge. A new result for the half-life of the neutrino-accompanied ββ decay of 76 Ge with significantly reduced uncertainties is also given, resulting in T 2ν 1/2 = (1.926 ± 0.094) × 10 21 yr.

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Section: The Background Modelmentioning

confidence: 99%

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

Agostini¹,

Allardt²,

Bakalyarov³

et al. 2015

Eur. Phys. J. C

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show abstract

“…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.…”

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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“…Activities from U, K, and Th are being estimated and preliminary upper limits are <0.03 counts/(kg·d) per isotope. Cosmogenic contributions are also [5], a simulation software framework based on Geant4 [6] and developed by the Majorana and GERDA collaborations. Simulations are being used to validate the background model and the pulse-shape analysis techniques, and to study other systematic effects.…”

Section: Background Modelmentioning

confidence: 99%

Background model for the Majorana Demonstrator

Cuesta

2017

J. Phys.: Conf. Ser.

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Abstract. The Majorana Collaboration is constructing a system containing 44 kg of highpurity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonnescale experiment capable of probing the neutrino mass scale to ∼15 meV. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 count/(ROI-t-y) in the 4 keV region of interest (ROI) around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials and analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact (PPC) HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements. Preliminary background results obtained during the engineering runs of the Demonstrator are presented.

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MaGe-a Geant4-Based Monte Carlo Application Framework for Low-Background Germanium Experiments

Cited by 146 publications

References 47 publications

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

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

Background model for the Majorana Demonstrator

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