Simulation-based design study for the passive shielding of the COSINUS dark matter experiment

Angloher, G.; Dafinei, I.; Marco, N. Di; Ferroni, F.; Fichtinger, S.; Filipponi, A.; Friedl, M.; Fuss, A.; Ge, Z. W.; Heikinheimo, Matti; Huitu, Katri; Maji, Rupali; Mancuso, M.; Pagnanini, L.; Petricca, F.; Pirro, S.; Pröbst, F.; Profeta, G.; Puiu, A.; Reindl, F.; Schäffner, K.; Schieck, J.; Schmiedmayer, D.; Schwertner, C.; Stahlberg, M.; Stendahl, A.; Wagner, F.; Yue, Shijing; Zema, V.; Zhu, Yuqing; Pandola, L.

doi:10.1140/epjc/s10052-022-10184-5

Cited by 9 publications

(11 citation statements)

References 61 publications

(97 reference statements)

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“…As shown in Ref. [14] these neutrons will be the dominant contribution to the COSINUS nuclear recoil background and an active Cherenkov muon veto is required to reduce this rate. As a charged particle enters the water tank, if the velocity of that particle is faster then the speed of light in that volume, Cherenkov radiation will be produced.…”

Section: Active Water Cherenkov Muon Vetomentioning

confidence: 92%

“…The geometry that was used was a simplified version of option 4 from Ref. [14]. A reflective foil (95% reflectivity) on the inner surface of the tank was added and the optical package of GEANT4 was implemented.…”

Section: Active Water Cherenkov Muon Vetomentioning

confidence: 99%

“…The COSINUS (Cryogenic Observatory for SIgnatures seen in Next-generation Underground Searches) experiment [11][12][13][14] will use NaI crystals operated as cryogenic scintillating calorimeters to cross-check the DAMA/LIBRA result. These detectors will be cooled to milli-Kelvin temperatures and provide a measurement of both the phonon and light signal caused by particle interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Further details about the experimental setup can be found in Ref. [14]. The first phase, called COSINUS-1π, aims for an exposure of 100 kg•days which, if the design threshold stated in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [14], a study of passive shielding configurations was performed to optimize the design of the COSINUS experiment to significantly reduce the flux of ambient and radiogenic neutrons and gammas. This study also showed that the passive shielding is insufficient for handling the background from cosmogenic neutrons, and thus an active water Cherenkov veto is required for the removal of these muoninduced events.…”

Section: Introductionmentioning

confidence: 99%

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Background suppression in the COSINUS experiment: Active muon veto and radiopure materials selection

Stukel

Angloher

Bharadwaj

et al. 2023

SciPost Phys. Proc.

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For over twenty-five years the DAMA/LIBRA experiment has reported an annual modulation signal that is consistent with a dark matter explanation. This signal is, currently, in tension with the null results observed by other searches that utilize different target detectors. The COSINUS experiment will perform a model-independent cross-check of the DAMA/LIBRA result by using the same target material, NaI crystals, operated as scintillating calorimeters. By measuring both temperature and light the NaI crystals in COSINUS will be able to distinguish between electron and nuclear recoils on an event-by-event basis. However, background events induced by cosmic-rays, environmental radioactivity or the intrinsic contamination of the materials used in the crystal, shielding and infrastructure can pose an issue to any analysis and must be fully understood. We report on the status of the development of the simulation for an active water Cherenkov muon veto, as well as the results of the beginning radiogenic material screening.

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Section: Active Water Cherenkov Muon Vetomentioning

confidence: 92%

Section: Active Water Cherenkov Muon Vetomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Background suppression in the COSINUS experiment: Active muon veto and radiopure materials selection

Stukel

Angloher

Bharadwaj

et al. 2023

SciPost Phys. Proc.

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Observing neutrinos from failed Supernovae at LNGS

Pagliaroli,

Ternes

2024

J. Cosmol. Astropart. Phys.

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We discuss the possibility to observe neutrinos emitted from a failed core collapse Supernova in the various experiments at Laboratori Nazionali del Gran Sasso. We show that the veto regions of dark matter and neutrinoless double beta decay experiments can be used as a network of small detectors to measure Supernova neutrinos. In addition we show that this network can measure very precisely the moment of black hole formation, which can be then used in the nearby VIRGO detector and future Einstein Telescope, in case the Sardinia site is selected, to look for the gravitational wave counterpart to the neutrino signal.

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Evidence for ground-state electron capture of K40

Hariasz,

Stukel,

Di Stefano

et al. 2023

Phys. Rev. C

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Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts estimated geological ages spanning billions of years, nuclear structure theory, and subatomic rare-event searches-including those for dark matter and neutrinoless double-beta decay. The decays of this long-lived isotope must be precisely known for its use as a geochronometer, and to account for its presence in low-background experiments. There are several known decay modes for potassium-40, but a predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The existence of this decay mode impacts several fields, while theoretical predictions span an order of magnitude. Here we report on the first, successful observation of this rare decay mode, obtained by the KDK (potassium decay) Collaboration using a novel combination of a low-threshold x-ray detector surrounded by a tonne-scale, high-efficiency γ -ray tagger at Oak Ridge National Laboratory. A blinded analysis reveals a distinctly nonzero ratio of intensities of ground-state electron-captures (I EC 0 ) over excitedstate ones (I EC* ) of I EC 0 /I EC* = 0.0095 stat ± 0.0022 sys ± 0.0010 (68% CL), with the null hypothesis rejected at 4σ [Stukel et al., Phys. Rev. Lett. 131, 052503 (2023)]. In terms of branching ratio, this unambiguous signal yieldsroughly half of the commonly used prediction. This first observation of a third-forbidden unique electron capture improves our understanding of low-energy backgrounds in dark-matter searches and has implications for nuclear-structure calculations. For example, a shell-model based theoretical estimate for the neutrinoless double-beta decay half-life of calcium-48 is increased by a factor of 7 +3 −2 . Our nonzero measurement shifts geochronological ages by up to a percent; implications are illustrated for Earth and solar system chronologies.

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Simulation-based design study for the passive shielding of the COSINUS dark matter experiment

Cited by 9 publications

References 61 publications

Background suppression in the COSINUS experiment: Active muon veto and radiopure materials selection

Background suppression in the COSINUS experiment: Active muon veto and radiopure materials selection

Observing neutrinos from failed Supernovae at LNGS

Evidence for ground-state electron capture of K40

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