Cosmogenic activation in germanium and copper for rare event searches

Cebrián, S.; Gómez, H.; Luzón, G.; Morales, J.; Tomás, A.; Villar, J.A.

doi:10.1016/j.astropartphys.2010.03.002

Cited by 53 publications

(60 citation statements)

References 39 publications

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“…The coincidence of its two γ lines in a single crystal produces a peak in the 0νββ ROI (at 2505.7 keV). 60 Co is primarily the result of fast neutron interactions on copper [29], but it can also be produced in tellurium [30,31]. Exploiting a coincident γ analysis we can set an upper limit of 3 × 10 −7 Bq/kg for the 60 Co concentration in the crystals, i.e.…”

Section: Construction Of Background Modelmentioning

confidence: 99%

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Measurement of the two-neutrino double-beta decay half-life of $$^{130}$$Te with the CUORE-0 experiment

et al. 2017

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We report on the measurement of the twoneutrino double-beta decay half-life of 130 Te with the CUORE-0 detector. From an exposure of 33.4 kg year of TeO 2 , the half-life is determined to be T 2ν 1/2 = [8.2 ± 0.2 (stat.) ± 0.6 (syst.)] × 10 20 year. This result is obtained after a detailed reconstruction of the sources responsible for the CUORE-0 counting rate, with a specific study of those contributing to the 130 Te neutrinoless double-beta decay region of interest.

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Section: Construction Of Background Modelmentioning

confidence: 99%

“…Following [29], we derive upper limits on their 60 Co activities based on the time they spent at sea-level and underground. The time spent underground before the start of data taking was a few months for the Holder, 14 years for the CryoInt, and 25 years for the CryoExt.…”

Section: Construction Of Background Modelmentioning

confidence: 99%

Measurement of the two-neutrino double-beta decay half-life of $$^{130}$$Te with the CUORE-0 experiment

et al. 2017

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“…The sea-level activation rates are taken from Ref. [21], except for 48 V, which is taken from Ref. [22].…”

Section: Non-line-of-sight Surfacesmentioning

confidence: 99%

Projected sensitivity of the SuperCDMS SNOLAB experiment

Agnese¹,

Anderson²,

Aramaki³

et al. 2017

Phys. Rev. D

294

339

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SuperCDMS SNOLAB will be a next-generation experiment aimed at directly detecting low-mass particles (with masses ≤ 10 GeV=c 2 ) that may constitute dark matter by using cryogenic detectors of two types (HV and iZIP) and two target materials (germanium and silicon). The experiment is being designed with an initial sensitivity to nuclear recoil cross sections ∼1 × 10 −43 cm 2 for a dark matter particle mass of * Corresponding author. tsaab@ufl.edu PHYSICAL REVIEW D 95, 082002 (2017) 2470-0010=2017=95(8)=082002 (17) 082002-1 © 2017 American Physical Society 1 GeV=c 2 , and with capacity to continue exploration to both smaller masses and better sensitivities. The phonon sensitivity of the HV detectors will be sufficient to detect nuclear recoils from sub-GeV dark matter. A detailed calibration of the detector response to low-energy recoils will be needed to optimize running conditions of the HV detectors and to interpret their data for dark matter searches. Low-activity shielding, and the depth of SNOLAB, will reduce most backgrounds, but cosmogenically produced 3 H and naturally occurring 32 Si will be present in the detectors at some level. Even if these backgrounds are 10 times higher than expected, the science reach of the HV detectors would be over 3 orders of magnitude beyond current results for a dark matter mass of 1 GeV=c 2 . The iZIP detectors are relatively insensitive to variations in detector response and backgrounds, and will provide better sensitivity for dark matter particles with masses ≳5 GeV=c 2 . The mix of detector types (HV and iZIP), and targets (germanium and silicon), planned for the experiment, as well as flexibility in how the detectors are operated, will allow us to maximize the low-mass reach, and understand the backgrounds that the experiment will encounter. Upgrades to the experiment, perhaps with a variety of ultra-low-background cryogenic detectors, will extend dark matter sensitivity down to the "neutrino floor," where coherent scatters of solar neutrinos become a limiting background.

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“…The EC decay scheme and the data of X-rays are shown in Fig. 3 and EC (6,2) 0.0335% EC (6,3) 0.234% EC (6,4) 0.096% EC (6,5) 0.0104% Fig. 3.…”

Section: X-raysmentioning

confidence: 99%

A background simulation method for cosmogenic nuclides inside HPGe detectors for rare event experiments

Zeng

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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Cosmogenic nuclides inside germanium detectors contribute background noise spectra quite different from ordinary external sources. We propose and discuss a nuclide decay and level transition model based on graph theory to understand the background contribution of the decay of cosmogenic nuclides inside a germanium crystal. In this work, not only was the level transition process, but the detector response time was also taken into consideration to decide whether or not to apply coincidence summing-up. We simulated the background spectrum of the internal cosmogenic nuclides in a germanium detector, and found some unique phenomena caused by the coincidence summing-up effect in the simulated spectrum. Thus, the background spectrum of each cosmogenic nuclide can be quantitatively obtained.

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Cosmogenic activation in germanium and copper for rare event searches

Cited by 53 publications

References 39 publications

Measurement of the two-neutrino double-beta decay half-life of $$^{130}$$Te with the CUORE-0 experiment

Measurement of the two-neutrino double-beta decay half-life of $$^{130}$$Te with the CUORE-0 experiment

Projected sensitivity of the SuperCDMS SNOLAB experiment

A background simulation method for cosmogenic nuclides inside HPGe detectors for rare event experiments

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