Cosmogenic activation of germanium used for tonne-scale rare event search experiments

Wei, Wenzhao; Mei, Dongming; Zhang, C.

doi:10.1016/j.astropartphys.2017.10.007

Cited by 26 publications

(34 citation statements)

References 45 publications

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“…As shown in figure 4, the transimpedance amplifier was used together with a multimeter to measure the leakage current. There are two main functions of the transimpedance amplifier: (1) converting the current to voltage; (2) amplifying the voltage signal. The voltage read out from the multimeter can be converted back to the current according to the amplification factor selected by the transimpedance amplifier.…”

Section: I-v Characteristicsmentioning

confidence: 99%

Investigation of amorphous germanium contact properties with planar detectors made from USD-grown germanium crystals

Wei

Meng

et al. 2018

J. Inst.

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A: The characterization of detectors fabricated from home-grown crystals is the most direct way to study crystal properties. We fabricated planar detectors from high-purity germanium (HPGe) crystals grown at the University of South Dakota (USD). In the fabrication process, a HPGe crystal slice cut from a USD-grown crystal was coated with a high resistivity thin film of amorphous Ge (a-Ge) followed by depositing a thin layer of aluminum on top of the a-Ge film to define the physical area of the contacts. We investigated the detector performance including the I-V characteristics, C-V characteristics and spectroscopy measurements for a few detectors. The results document the good quality of the USD-grown crystals and electrical contacts. K: amorphorous germanium contacts, planar germanium detectors, leakage current, gamma ray spectroscopy 1Corresponding author.

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Section: I-v Characteristicsmentioning

confidence: 99%

Investigation of amorphous germanium contact properties with planar detectors made from USD-grown germanium crystals

Wei

Meng

et al. 2018

J. Inst.

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“…55 using two different neutron spectra. This was followed by other estimates based in TALYS 59 and ACTIVIA and GEANT4, 36,37 profiting from the availability of reaction codes that fully identify all the reaction products in the final state. In Ref.…”

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confidence: 99%

“…36, estimating the production rates of many isotopes including tritium not only for dominating neutrons but also for protons and muons, using Geant4 simulations and ACTIVIA calculations. In addition, the effect of a shielding against activation has been analyzed and the expected background rates in the regions of interest have been evaluated for particular exposure and cooling conditions.…”

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confidence: 99%

Cosmogenic activation of materials

Cebrián

2017

Int. J. Mod. Phys. A

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Experiments looking for rare events like the direct detection of dark matter particles, neutrino interactions or the nuclear double beta decay are operated deep underground to suppress the effect of cosmic rays. But the production of radioactive isotopes in materials due to previous exposure to cosmic rays is an hazard when ultra-low background conditions are required. In this context, the generation of long-lived products by cosmic nucleons has been studied for many detector media and for other materials commonly used. Here, the main results obtained on the quantification of activation yields on the Earth's surface will be summarized, considering both measurements and calculations following different approaches. The isotope production cross sections and the cosmic ray spectrum are the two main ingredients when calculating this cosmogenic activation; the different alternatives for implementing them will be discussed. Activation that can take place deep underground mainly due to cosmic muons will be briefly commented too. Presently, the experimental results for the cosmogenic production of radioisotopes are scarce and discrepancies between different calculations are important in many cases, but the increasing interest on this background source which is becoming more and more relevant can help to change this situation.

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“…The decay leads to an energy deposition in the sensor and generates background events in the region of interest. The decay product 32 P is also unstable and decays with a half-life of t 1/2 = 14.268 days and an energy release of 1.711 MeV to the stable isotope 32 S. A further cosmogenic background is 3 H produced via muon spallation and inelastic scattering of neutrons on silicon [28,29]. It undergoes a β − -decay into the stable 3 He with an energy release of 18.592 keV.…”

Section: Simulation Of Background Contributions From Intrinsic Radioamentioning

confidence: 99%

“…In a conservative approach we use the upper limit and set R 3H = 108.74 kg −1 day −1 . The cosmogenic induced activity A 3H is then given by [28] Fig. 10 Simulation of the energy deposition in a silicon sensor from radioactive 32 Si/ 32 P decays with a given activity of 80 kg −1 day −1 and 3 H decays with a given activity of 11.57 kg −1 day −1 .…”

Section: Simulation Of Background Contributions From Intrinsic Radioamentioning

confidence: 99%

DEPFET detectors for direct detection of MeV Dark Matter particles

et al. 2017

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The existence of dark matter is undisputed, while the nature of it is still unknown. Explaining dark matter with the existence of a new unobserved particle is among the most promising possible solutions. Recently dark matter candidates in the MeV mass region received more and more interest. In comparison to the mass region between a few GeV to several TeV, this region is experimentally largely unexplored. We discuss the application of a RNDR DEPFET semiconductor detector for direct searches for dark matter in the MeV mass region. We present the working principle of the RNDR DEPFET devices and review the performance obtained by previously performed prototype measurements. The future potential of the technology as dark matter detector is discussed and the sensitivity for MeV dark matter detection with RNDR DEPFET sensors is presented. Under the assumption of six background events in the region of interest and an exposure of 1 kg year a sensitivity of about σ e = 10 −41 cm 2 for dark matter particles with a mass of 10 MeV can be reached.

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Cosmogenic activation of germanium used for tonne-scale rare event search experiments

Cited by 26 publications

References 45 publications

Investigation of amorphous germanium contact properties with planar detectors made from USD-grown germanium crystals

Investigation of amorphous germanium contact properties with planar detectors made from USD-grown germanium crystals

Cosmogenic activation of materials

DEPFET detectors for direct detection of MeV Dark Matter particles

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