Characterization of a broad-energy germanium detector for its use in CJPL

Zeng, Zhi; Mi, Yu-Hao; Zeng, Ming; Ma, Hui; Yue, Qian; Cheng, Jianping; Li, Junli; Qiu, Rui; Zhang, Hui

doi:10.1007/s41365-016-0162-y

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…If the dead layer begins to thicken, the area of the lower energy peak would reduce relative to the higher energy peak. A similar technique using a collimated 241 Am source is described in [21] although we only monitor the overall dead-layer thickness, not the position dependent thickness. Figure 8(a) shows the stability of FWHM resolution for the Roseberry detector for the calibration energies.…”

Section: Calibrationmentioning

confidence: 99%

Ultra-low background germanium assay at the Boulby Underground Laboratory

Scovell,

Meehan,

Paling

et al. 2024

J. Inst.

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As we move to an era where next generation ultra-low background particle physics experiments begin to be designed and constructed, the ability to assay materials with high sensitivity and at speed with a variety of techniques will be key. This paper describes the Mirion Technologies (Canberra) specialty ultra-low background detectors installed and commissioned at the Boulby Underground Laboratory between 2017 and 2021. The low background levels of the detectors combine with low background shielding and a radon-reduced dry nitrogen purge system to give sensitivity approaching the best in the world without the need for intricate shielding solutions. For an optimised sample geometry, run for 100 d, it would be possible to reach close to 10 μBq kg-1 (10-12 g/g) for background radionuclides of interest in neutrinoless double-beta decay.

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Section: Calibrationmentioning

confidence: 99%

Ultra-low background germanium assay at the Boulby Underground Laboratory

Scovell,

Meehan,

Paling

et al. 2024

J. Inst.

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show abstract

“…The discrepancy between data and simulated efficiencies could be explained if the crystal active volume had a major alteration with respect to that reported in the technical sheet. In order to explore this possibility, a crystal scan was performed following a similar method as in [19,20].…”

Section: If-begementioning

confidence: 99%

Characterization of germanium detectors for the first underground laboratory in Mexico

et al. 2020

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This article reports the characterization of two High Purity Germanium detectors performed by extracting and comparing their efficiencies using experimental data and Monte Carlo simulations. The efficiencies were calculated for pointlike γ-ray sources as well as for extended calibration sources. Characteristics of the detectors such as energy linearity, energy resolution and full energy peak efficiencies are reported from measurements performed on surface laboratories. The detectors will be deployed in a γ-ray assay facility that will be located in the first underground laboratory in Mexico, Laboratorio Subterr'aneo de Mineral del Chico (LABChico), in the Comarca Minera UNESCO Global Geopark [1].

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“…The CDEX [1] (China Dark matter EXperiment) in CJPL (China Jinping Underground Laboratory) [2] is located in Xichang, Sichuan province, China. CDEX-1 deploys one kg-scale mass pPCGe (p-type Point Contact Germanium) detector enclosed by a NaI(Tl) crystal scintillator as anti-Compton detector [3].…”

Section: Introductionmentioning

confidence: 99%

Prototype of pulse digitizer and readout electronics for CDEX-10 in CJPL

Zhu¹,

Li²,

Xue³

et al. 2020

J. Inst.

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The CDEX (China Dark matter Experiment) is currently in the stage to upgrade to approximately 10 kg HPGe (High Purity Germanium) detectors (CDEX-10) in CJPL (China Jinping Underground Laboratory) and aims to detect the WIMP (Weakly Interacting Massive Particles). Six analog signals and one inhibited signal are outputted from preamplifier by one HPGe detector (~1 kg) of CDEX-10. The analog signals are conditioned with two 6-µs and one 12-µs shaping amplifiers, and three timing amplifiers respectively. The inhibited signal is used for trigger. The analog signals from shaping and timing amplifiers are digitized to obtain energy spectrum and rise-time distribution. The rise-time distribution is used to discriminate surface, bulk, and very bulk events, which can help to supress the background level in dark matter detection. Composed of commercial modules, the previous DAQ (Data Acquisition Systems) is insufficient in discriminating between bulk and very bulk events due to the limited sampling rate (100 MSPS). Besides, as number of channel increases, the system will be simplified by integrating the trigger logic in FPGA (Field Programmable Gate Array). In this paper, a prototype named RAIN4HPGe is designed with pulse digitizer and readout electronics, integrating 14-Bit 100 MSPS ADCs (Analog-to-Digital Converters), 12-Bit 1 GSPS ADCs, FPGA etc.. The RAIN1000Z1 readout module based on ZYNQ SoC (System on Chip) is used for readout over Gigabit Ethernet. Better energy resolution, e.g. improving from 558 eV to 474 eV @122 keV, can be achieved by RAIN4HPGe compared to previous DAQ (Data Acquisition Systems) with commercial solution. Moreover, the discrimination performance of bulk, and very bulk events has been improved by RAIN4HPGe with 1 GSPS ADC.

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Characterization of a broad-energy germanium detector for its use in CJPL

Cited by 15 publications

References 16 publications

Ultra-low background germanium assay at the Boulby Underground Laboratory

Ultra-low background germanium assay at the Boulby Underground Laboratory

Characterization of germanium detectors for the first underground laboratory in Mexico

Prototype of pulse digitizer and readout electronics for CDEX-10 in CJPL

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