The COBRA demonstrator at the LNGS underground laboratory

Ebert, J.; Fritts, M.; Gehre, D.; Gößling, C.; Göpfert, T.; Hagner, C.; Heidrich, N.; Klingenberg, R.; Köttig, T.; Kroeninger, K.; Michel, Thilo; Neddermann, Till; Nitsch, Christian; Oldorf, C.; Quante, Thomas; Rajek, S.; Rebber, Henning; Reinecke, Oscar; Rohatsch, K.; Schulz, O.; Sörensen, A; Štekl, I.; Tebrügge, Jan; Temminghoff, R.; Theinert, R.; Timm, J.; Wester, T.; Wonsak, B.; Zatschler, Stefan; Zuber, Κ.

doi:10.1016/j.nima.2015.10.079

Cited by 27 publications

(18 citation statements)

References 16 publications

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“…Currently, it comprises 64 coplanar-grid (CPG) detectors arranged in four layers of 4 × 4 crystals. This stage of the experiment is referred to as the COBRA demonstrator [53]. Each crystal has a size of about 1×1×1 cm 3 and a mass of about 6.0 g. All of them are coated with a clear encapsulation known to be radio-pure.…”

Section: Methodsmentioning

confidence: 99%

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Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Bodenstein-Dresler¹,

Chu²,

Gehre³

et al. 2020

Physics Letters B

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A dedicated study of the quenching of the weak axial-vector coupling strength g A in nuclear processes has been performed by the COBRA collaboration. This investigation is driven by nuclear model calculations which show that the β-spectrum shape of the fourfold forbidden non-unique decay of 113 Cd strongly depends on the effective value of g A . Using an array of CdZnTe semiconductor detectors, 45 independent 113 Cd spectra were obtained and interpreted in the context of three nuclear models. The resulting effective mean values are g A (ISM) = 0.914 ± 0.008, g A (MQPM) = 0.910 ± 0.013 and g A (IBFM-2) = 0.955 ± 0.035. These values agree well within the determined uncertainties and deviate significantly from the free value of g A . This can be seen as a first step towards answering the long-standing question regarding quenching effects related to g A in low-energy nuclear processes.

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Section: Methodsmentioning

confidence: 99%

“…More recently, the COBRA collaboration used the 113 Cd β-decay to investigate the demonstrator's detector stability by monitoring the average decay rate over the time scale of several years [52]. Such a continuous data-taking was not achieved in any experiment dedicated to the study of long-lived β-decays before.…”

Section: Previous Studies On 113 CDmentioning

confidence: 99%

Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Bodenstein-Dresler¹,

Chu²,

Gehre³

et al. 2020

Physics Letters B

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“…The 14 C abundance is calculated from the evaluated counting rate of 40 ± 1 Bq/100t [155]. The contents of 238 U and 232 Th are obtained from the detected counting rates of 222 Rn (by counting 214 Bi-Po coincidence events) and that of 220 Rn (by 212 Bi-Po coincidence events), assuming secular equilibrium in the corresponding decay chain. The 210 Po decay is not in equilibrium with the parent nuclei, as could be concluded from the observed decrease in the 210 Po counting rate with the characteristic time constant [150] corresponding to the 210 Po life-time T 1/2 =138.4 d. The observed longterm time variations of the 210 Po counting rate were more complex compared to a simple exponential decay.…”

Section: Radiopuritymentioning

confidence: 99%

“…A fast scintillator can be used to reconstruct the vertex of the events [210]. There are currently two other experiments in progress searching for the double beta decay of 106 Cd: the TGV-2 experiment in the Modane underground laboratory in France utilizing 32 planar HPGe detectors with 16 thin foils of enriched 106 Cd (23.2 g) installed between the detectors [211], and the COBRA experiment, using an array of CdZnTe semiconductors (∼380 g of natural Cd) at the Gran Sasso underground laboratory [212]. COBRA is intended for a large-scale experiment with a total source mass of about 400 kg of CdZnTe enriched in another "double-beta" isotope 116 Cd to about 90%.…”

Section: Ibd and Resonant Electron Capture On Other Nuclear Targetsmentioning

confidence: 99%

Experimental aspects of geoneutrino detection: Status and perspectives

Smirnov

2019

Progress in Particle and Nuclear Physics

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Neutrino geophysics, the study of the Earth's interior by measuring the fluxes of geologically produced neutrino at its surface, is a new interdisciplinary field of science, rapidly developing as a synergy between geology, geophysics and particle physics. Geoneutrinos, antineutrinos from longlived natural isotopes responsible for the radiogenic heat flux, provide valuable information for the chemical composition models of the Earth. The calculations of the expected geoneutrino signal are discussed, together with experimental aspects of geoneutrino detection, including the description of possible backgrounds and methods for their suppression. At present, only two detectors, Borexino and KamLAND, have reached sensitivity to the geoneutrino. The experiments accumulated a set of ∼190 geoneutrino events and continue the data acquisition. The detailed description of the experiments, their results on geoneutrino detection, and impact on geophysics are presented. The start of operation of other detectors sensitive to geoneutrinos is planned for the near future: the SNO+ detector is being filled with liquid scintillator, and the biggest ever 20 kt JUNO detector is under construction. A review of the physics potential of these experiments with respect to the geoneutrino studies, along with other proposals, is presented. New ideas and methods for geoneutrino detection are reviewed.

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“…The COBRA collaboration operates a demonstrator setup at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy to prepare a large-scale experiment for the search for neutrinoless double beta-decays of several isotopes using CdZnTe semiconductor detectors [1,2]. A description of the current status of the experiment can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a large CdZnTe coplanar quad-grid semiconductor detector

Ebert

Gehre

Gößling

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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The COBRA collaboration aims to search for neutrinoless double beta-decay of 116 Cd. A demonstrator setup with 64 CdZnTe semiconductor detectors, each with a volume of 1 cm 3 , is currently being operated at the LNGS underground laboratory in Italy. This paper reports on the characterization of a large 2 × 2 × 1.5 cm 3 CdZnTe detector with a new coplanar-grid design for applications in γ-ray spectroscopy and low-background operation. Several studies of electric properties as well as of the spectrometric performance, like energy response and resolution, are conducted. Furthermore, measurements including investigating the operational stability and a possibility to identify multiple-scattered photons are presented.

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The COBRA demonstrator at the LNGS underground laboratory

Cited by 27 publications

References 16 publications

Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Experimental aspects of geoneutrino detection: Status and perspectives

Characterization of a large CdZnTe coplanar quad-grid semiconductor detector

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