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

Bae, H.; Jeon, E. J.; Kim, Yeongduk; Lee, S W

doi:10.1016/j.astropartphys.2019.06.006

“…A preliminary muon flux was measured to be 1.0 × 10 -7 μ/cm 2 •s, four times less than the muon flux at Y2L, 3.8 × 10 -7 μ/cm 2 •s [7]. The measured value is consistent with an expectation value of 8.2 × 10 -8 μ/ cm 2 •s using a GEANT4 simulation [8]. To profile the muons for each cavern precisely, we plan to install a thick plastic (or liquid) scintillator for long-time measurements at different caverns and provide the values to the experiments, which want to avoid the muon background.…”

Section: Radiation Background and Measurementssupporting

confidence: 74%

Construction of Yemilab

Park,

Kim,

Bang

et al. 2024

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The Center for Underground Physics of the Institute for Basic Science (IBS) in Korea has been planning the construction of a deep underground laboratory since 2013 to search for extremely rare interactions such as dark matter and neutrinos. In September 2022, a new underground laboratory, Yemilab, was finally completed in Jeongseon, Gangwon Province, with a depth of 1,000 m and an exclusive experimental area spanning 3,000 m3. The tunnel is encased in limestone and accommodates 17 independent experimental spaces. Over 2 years, from 2023 to 2024, the Yangyang Underground Laboratory facilities will be relocated to Yemilab. Preparations are underway for the AMoRE-II, a neutrinoless double beta decay experiment, scheduled to begin in Q2 2024 at Yemilab. Additionally, Yemilab includes a cylindrical pit with a volume of approximately 6,300 m3, designed as a multipurpose laboratory for next-generation experiments involving neutrinos, dark matter, and related research. This article provides a focused overview of the construction and structure of Yemilab.

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“…The "Shielding" physics list contains the electromagnetic and hadronic physics processes for high-energy and underground detector simulation. We have performed calculation from different physics list, the "QGSP BERT HP" physics list with high precision neutron model implemented for neutrons at low energy, which was used in simulation studies for underground experiments [31]. The results are found to be compatible in trend and magnitude.…”

Section: Monte Carlo Simulation Setupmentioning

confidence: 96%

Cosmogenic background study for a 100Mo-based bolometric demonstration experiment at China JinPing underground Laboratory

Chen,

Ma,

Chen

et al. 2022

Preprint

0

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We perform simulation study for a 10-kg 100 Mo-based bolometeric demonstration experiment for neutrinoless double-beta decay (0νββ) search at China JinPing underground Laboratory (CJPL). Cosmogenic production of radionuclides in 100 Mo-enriched lithium molybdate crystals and copper components of the detector system are studied using Geant4 toolkit based on the simulated cosmic ray data from the CRY library. Background energy spectra of the cosmogenic radionuclides including 56 Co, 82 Rb and 88 Y which are harmful for the 100 Mo-based 0νββ experiment are investigated. We then evaluate the total cosmogenic background level in the 100 Mo 0νββ search energy region of interest (ROI) for the demonstration experiment. After one year of cooling down underground, the residual background contribution is found to be 1.8×10 −6 cts/kg/keV/yr and 3.3×10 −4 cts/kg/keV/yr from crystals and copper components, respectively. Furthermore, underground cosmogenic activation of copper and lithium molybdate crystal is calculated based on the simulation spectra of neutron and proton in CJPL. The underground cosmogenic background is found to be negligible in the ROI.

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“…We have performed calculation from different physics list, the "QGSP_BERT_HP"physics list with high precision neutron model implemented for neutrons at low energy, which was used in simulation studies for underground experiments [31]. The results are found to be compatible in trend and magnitude.…”

Section: Monte Carlo Simulation Setupmentioning

confidence: 96%

Cosmogenic background study for a $$^{100}$$Mo-based bolometric demonstration experiment at China JinPing underground Laboratory

Chen

¹

,

Ma

²

,

Chen

³

et al. 2022

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We perform simulation study for a 10-kg $$^{100}$$ 100 Mo-based bolometeric demonstration experiment for neutrinoless double-beta decay ($$0\nu \beta \beta $$ 0 ν β β ) search at China JinPing underground Laboratory (CJPL). Cosmogenic production of radionuclides in $$^{100}$$ 100 Mo-enriched lithium molybdate crystals and copper components of the detector system are studied using Geant4 toolkit based on the simulated cosmic ray data from the CRY library. Background energy spectra of the cosmogenic radionuclides including $$^{56}$$ 56 Co, $$^{82}$$ 82 Rb and $$^{88}$$ 88 Y which are harmful for the $$^{100}$$ 100 Mo-based $$0\nu \beta \beta $$ 0 ν β β experiment are investigated. We then evaluate the total cosmogenic background level in the $$^{100}$$ 100 Mo $$0\nu \beta \beta $$ 0 ν β β search energy region of interest (ROI) for the demonstration experiment. After one year of cooling down underground, the residual background contribution is found to be 1.8 $$\times $$ × 10$$^{-6}$$ - 6 cts/kg/keV/yr and 3.3$$\times $$ × 10$$^{-4}$$ - 4 cts/kg/keV/yr from crystals and copper components, respectively. Furthermore, underground cosmogenic activation of copper and lithium molybdate crystal is calculated based on the simulation spectra of neutron and proton in CJPL. The underground cosmogenic background is found to be negligible in the ROI.

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

Cited by 9 publications

References 27 publications

Construction of Yemilab

Construction of Yemilab

Cosmogenic background study for a 100Mo-based bolometric demonstration experiment at China JinPing underground Laboratory

Cosmogenic background study for a $$^{100}$$Mo-based bolometric demonstration experiment at China JinPing underground Laboratory

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