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Background reduction and sensitivity for germanium double beta decay experiments

Germanium detectors have very good capabilities for the investigation of rare phenomena like the neutrinoless double beta decay. Rejection of the background entangling the expected signal is one primary goal in this kind of experiments.…

Nuclear Experiment · Physics 2008-11-26 H. Gómez , S. Cebrián , J. Morales , J. A. Villar

Searching for $^{76}$Ge neutrinoless double beta decay with the CDEX-1B experiment

We operated a p-type point contact high purity germanium (PPCGe) detector (CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for 500.3 days to search for neutrinoless double beta ($0\nu\beta\beta$) decay of $^{76}$Ge. A…

Nuclear Experiment · Physics 2024-09-24 B. T. Zhang , J. Z. Wang , L. T. Yang , Q. Yue , K. J. Kang , Y. J. Li , H. P. An , Greeshma C. , J. P. Chang , Y. H. Chen , J. P. Cheng , W. H. Dai , Z. Deng , C. H. Fang , X. P. Geng , H. Gong , Q. J. Guo , X. Y. Guo , L. He , S. M. He , J. W. Hu , H. X. Huang , T. C. Huang , H. T. Jia , X. Jiang , S. Karmakar , H. B. Li , J. M. Li , J. Li , Q. Y. Li , R. M. J. Li , X. Q. Li , Y. L. Li , Y. F. Liang , B. Liao , F. K. Lin , S. T. Lin , J. X. Liu , S. K. Liu , Y. D. Liu , Y. Liu , Y. Y. Liu , Z. Z. Liu , H. Ma , Y. C. Mao , Q. Y. Nie , J. H. Ning , H. Pan , N. C. Qi , J. Ren , X. C. Ruan , Z. She , M. K. Singh , T. X. Sun , C. J. Tang , W. Y. Tang , Y. Tian , G. F. Wang , L. Wang , Q. Wang , Y. F. Wang , Y. X. Wang , H. T. Wong , S. Y. Wu , Y. C. Wu , H. Y. Xing , R. Xu , Y. Xu , T. Xue , Y. L. Yan , N. Yi , C. X. Yu , H. J. Yu , J. F. Yue , M. Zeng , Z. Zeng , F. S. Zhang , L. Zhang , Z. H. Zhang , Z. Y. Zhang , K. K. Zhao , M. G. Zhao , J. F. Zhou , Z. Y. Zhou , J. J. Zhu

Dark Matter Search with sub-keV Germanium Detectors at the China Jinping Underground Laboratory

Germanium detectors with sub-keV sensitivities open a window to search for low-mass WIMP dark matter. The CDEX-TEXONO Collaboration is conducting the first research program at the new China Jinping Underground Laboratory with this approach.…

Instrumentation and Detectors · Physics 2019-08-14 Qian Yue , Henry T. Wong

A Search of Low-Mass WIMPs with p-type Point Contact Germanium Detector in the CDEX-1 Experiment

The CDEX-1 experiment conducted a search of low-mass (< 10 GeV/c2) Weakly Interacting Massive Particles (WIMPs) dark matter at the China Jinping Underground Laboratory using a p-type point-contact germanium detector with a fiducial mass of…

High Energy Physics - Experiment · Physics 2016-10-25 W. Zhao , Q. Yue , K. J. Kang , J. P. Cheng , Y. J. Li , H. T. Wong , S. T. Lin , J. P. Chang , J. H. Chen , Q. H. Chen , Y. H. Chen , Z. Deng , Q. Du , H. Gong , X. Q. Hao , H. J. He , Q. J. He , H. X. Huang , T. R. Huang , H. Jiang , H. B. Li , J. Li , J. Li , J. M. Li , X. Li , X. Y. Li , Y. L. Li , F. K. Lin , S. K. Liu , L. C. Lü , H. Ma , J. L. Ma , S. J. Mao , J. Q. Qin , J. Ren , J. Ren , X. C. Ruan , V. Sharma , M. B. Shen , L. Singh , M. K. Singh , A. K. Soma , J. Su , C. J. Tang , J. M. Wang , L. Wang , Q. Wang , S. Y. Wu , Y. C. Wu , Z. Z. Xianyu , R. Q. Xiao , H. Y. Xing , F. Z. Xu , Y. Xu , X. J. Xu , T. Xue , L. T. Yang , S. W. Yang , N. Yi , C. X. Yu , H. Yu , X. Z. Yu , M. Zeng , X. H. Zeng , Z. Zeng , L. Zhang , Y. H. Zhang , M. G. Zhao , Z. Y. Zhou , J. J. Zhu , W. B. Zhu , X. Z. Zhu , Z. H. Zhu

High-purity germanium detector ionization pulse shapes of nuclear recoils, gamma interactions and microphonism

Nuclear recoil measurements with high-purity Germanium detectors are very promising to directly detect dark matter candidates. The main background sources in such experiments are natural radioactivity and microphonic noise. Digital pulse…

High Energy Physics - Experiment · Physics 2009-10-31 L. Baudis , J. Hellmig , H. V. Klapdor-Kleingrothaus , Y. Ramachers , J. W. Hammer , A. Mayer

Fabrication and Performance Tests of a Segmented P-Type HPGe Detector

A p-type HPGe detector has been segmented by cutting, with a diamond saw, and etching six circumferential grooves through the Li-diffused dead layer. The degree of segmentation was tested with the 88 keV gamma rays from a well-collimated…

Nuclear Experiment · Physics 2008-11-26 George S. King , Frank T. Avignone , Christopher E. Cox , Todd W. Hossbach , Wayne Jennings , James H. Reeves

A precise method to determine the activity of a weak neutron source using a germanium detector

A standard high purity germanium (HPGe) detector was used to determine the previously unknown neutron activity of a weak americium-beryllium (AmBe) neutron source. Gamma rays were created through 27Al(n,n'), 27Al(n,gamma) and 1H(n,gamma)…

Instrumentation and Detectors · Physics 2016-08-01 M. J. M. Duke , A. L. Hallin , C. B. Krauss , P. Mekarski , L. Sibley

Constraints on Sub-GeV Dark Matter--Electron Scattering from the CDEX-10 Experiment

We present improved germanium-based constraints on sub-GeV dark matter via dark matter--electron ($\chi$-$e$) scattering using the 205.4 kg$\cdot$day dataset from the CDEX-10 experiment. Using a novel calculation technique, we attain…

High Energy Physics - Experiment · Physics 2022-11-22 Z. Y. Zhang , L. T. Yang , Q. Yue , K. J. Kang , Y. J. Li , M. Agartioglu , H. P. An , J. P. Chang , Y. H. Chen , J. P. Cheng , W. H. Dai , Z. Deng , C. H. Fang , X. P. Geng , H. Gong , Q. J. Guo , X. Y. Guo , L. He , S. M. He , J. W. Hu , H. X. Huang , T. C. Huang , H. T. Jia , X. Jiang , H. B. Li , J. M. Li , J. Li , Q. Y. Li , R. M. J. Li , X. Q. Li , Y. L. Li , Y. F. Liang , B. Liao , F. K. Lin , S. T. Lin , S. K. Liu , Y. D. Liu , Y. Liu , Y. Y. Liu , Z. Z. Liu , H. Ma , Y. C. Mao , Q. Y. Nie , J. H. Ning , H. Pan , N. C. Qi , J. Ren , X. C. Ruan , K. Saraswat , V. Sharma , Z. She , M. K. Singh , T. X. Sun , C. J. Tang , W. Y. Tang , Y. Tian , G. F. Wang , L. Wang , Q. Wang , Y. Wang , Y. X. Wang , H. T. Wong , S. Y. Wu , Y. C. Wu , H. Y. Xing , R. Xu , Y. Xu , T. Xue , Y. L. Yan , C. H. Yeh , N. Yi , C. X. Yu , H. J. Yu , J. F. Yue , M. Zeng , Z. Zeng , B. T. Zhang , F. S. Zhang , L. Zhang , Z. H. Zhang , K. K. Zhao , M. G. Zhao , J. F. Zhou , Z. Y. Zhou , J. J. Zhu

Low Background Gamma Spectroscopy at the Boulby Underground Laboratory

The Boulby Underground Germanium Suite (BUGS) comprises three low background, high-purity germanium detectors operating in the Boulby Underground Laboratory, located 1.1 km underground in the north-east of England, UK. BUGS utilises three…

Instrumentation and Detectors · Physics 2017-12-20 P. R. Scovell , E. Meehan , H. M. Araújo , J. Dobson , C. Ghag , H. Kraus , V. A. Kudryavtsev , X-. R. Liu , P. Majewski , S. M. Paling , R. M. Preece , R. Saakyan , A. Tomás , C. Toth , L. M. Yeoman

Dark Matter Search Results from the Commissioning Run of PandaX-II

We present the results of a search for WIMPs from the commissioning run of the PandaX-II experiment located at the China Jinping underground Laboratory. A WIMP search data set with an exposure of 306$\times$19.1 kg-day was taken, while its…

High Energy Physics - Experiment · Physics 2016-06-29 PandaX Collaboration , Andi Tan , Xiang Xiao , Xiangyi Cui , Xun Chen , Yunhua Chen , Deqing Fang , Changbo Fu , Karl Giboni , Franco Giuliani , Haowei Gong , Shouyang Hu , Xingtao Huang , Xiangdong Ji , Yonglin Ju , Siao Lei , Shaoli Li , Xiaomei Li , Xinglong Li , Hao Liang , Qing Lin , Huaxuan Liu , Jianglai Liu , Wolfgang Lorenzon , Yugang Ma , Yajun Mao , Kaixuan Ni , Kirill Pushkin , Xiangxiang Ren , Michael Schubnell , Manbin Shen , Fang Shi , Scott Stephenson , Hongwei Wang , Jiming Wang , Meng Wang , Qiuhong Wang , Siguang Wang , Xuming Wang , Zhou Wang , Shiyong Wu , Mengjiao Xiao , Pengwei Xie , Binbin Yan , Yong Yang , Jianfeng Yue , Xionghui Zeng , Hongguang Zhang , Hua Zhang , Huanqiao Zhang , Tao Zhang , Li Zhao , Jing Zhou , Xiaopeng Zhou

Background discrimination capabilities of a heat and ionization germanium cryogenic detector

The discrimination capabilities of a 70 g heat and ionization Ge bolometer are studied. This first prototype has been used by the EDELWEISS Dark Matter experiment, installed in the Laboratoire Souterrain de Modane, for direct detection of…

Astrophysics · Physics 2009-10-31 P. Di Stefano , L. Berge , B. Chambon , M. Chapellier , J. Chaumont , G. Chardin , P. Charvin , M. De Jesus , D. Drain , L. Dumoulin , P. Forget , P. Garoche , J. Gascon , C. Goldbach , D. L'Hote , J. Mallet , J. Mangin , S. Marnieros , L. Miramonti , L. Mosca , X. -F. Navick , G. Nollez , P. Pari , S. Pecourt , E. Simon , L. Stab , J. -P. Torre , R. Tourbot , D. Yvon

Highly Sensitive Gamma-Spectrometers of GERDA for Material Screening: Part 2

The previous article about material screening for GERDA points out the importance of strict material screening and selection for radioimpurities as a key to meet the aspired background levels of the GERDA experiment. This is directly done…

Instrumentation and Detectors · Physics 2008-12-04 D. Budjáš , W. Hampel , M. Heisel , G. Heusser , M. Keillor , M. Laubenstein , W. Maneschg , G. Rugel , S. Schönert , H. Simgen , H. Strecker

First Results from the HDMS experiment in the Final Setup

The Heidelberg Dark Matter Search (HDMS) is an experiment designed for the search for WIMP dark matter. It is using a special configuration of Ge detectors, to efficiently reduce the background in the low-energy region below 100 keV. After…

High Energy Physics - Phenomenology · Physics 2008-11-26 H. V. Klapdor-Kleingrothaus , A. Dietz , G. Heusser , I. V. Krivosheina , D. Mazza , H. Strecker , C. Tomei

Background Shielding by Dense Samples in Low-Level Gamma Spectrometry

In low activity gamma spectrometric measurements of large, dense samples, the bulk sample material shields the HPGe crystal from external background sources. If not accounted for in studies that utilise background-subtraction methods, this…

Instrumentation and Detectors · Physics 2022-09-08 M. Thiesse , P. Scovell , L. Thompson

Exploring dark matter with quantum-enhanced haloscopes and time projection chambers

This thesis explores experimental and theoretical approaches to dark matter detection, from gas-based detectors to quantum sensors, tackling the challenge of identifying dark matter, which makes up 27% of the Universe's energy. It reviews…

Instrumentation and Methods for Astrophysics · Physics 2025-12-05 David Díez-Ibáñez

Fabrication and Characterization of High-Purity Germanium Detectors with Amorphous Germanium Contacts

Large, high-purity, germanium (HPGe) detectors are needed for neutrinoless double-beta decay and dark matter experiments. Currently, large (> 4 inches in diameter) HPGe crystals can be grown at the University of South Dakota (USD). We…

Instrumentation and Detectors · Physics 2019-03-27 X. -H. Meng , G. -J. Wang , M. -D. Wagner , H. Mei , W. -Z. Wei , J. Liu , G. Yang , D. -M. Mei

Particle Dark Matter and Solar Axion Searches with a small germanium detector at the Canfranc Underground Laboratory

A small, natural abundance, germanium detector (COSME) has been operating recently at the Canfranc Underground Laboratory (Spanish Pyrenees) in improved conditions of shielding and overburden with respect to a previous operation of the same…

High Energy Physics - Experiment · Physics 2008-11-26 A. Morales , F. T. Avignone , R. L. Brodzinski , S. Cebrian , E. Garcia , D. Gonzalez , I. G. Irastorza , H. S. Miley , J. Morales , A. Ortiz de Solorzano , J. Puimedon , J. H. Reeves , M. L. Sarsa , S. Scopel , J. A. Villar

Measurement of photoelectron yield of the prototype for the CDEX-10 liquid argon detector

The China Dark Matter Experiment (CDEX) is a low background experiment at China Jinping Underground Laboratory (CJPL) designed to directly detect dark matter with a high-purity Germanium (HPGe) detector. In the second phase CDEX-10 with a…

Instrumentation and Detectors · Physics 2016-12-09 Qing-Hao Chen , Qian Yue , Jian-Ping Cheng , Ke-Jun Kang , Yuan-Jing Li , Shin-Ted Lin , Chang-Jian Tang , Hao-Yang Xing , Xun-Zhen Yu , Ming Zeng

Dark Matter Results from First 98.7-day Data of PandaX-II Experiment

We report the WIMP dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing Underground Laboratory. No dark matter candidate is…

High Energy Physics - Experiment · Physics 2016-09-21 II Collaboration , Andi Tan , Mengjiao Xiao , Xiangyi Cui , Xun Chen , Yunhua Chen , Deqing Fang , Changbo Fu , Karl Giboni , Franco Giuliani , Haowei Gong , Shouyang Hu , Xingtao Huang , Xiangdong Ji , Yonglin Ju , Siao Lei , Shaoli Li , Xiaomei Li , Xinglong Li , Hao Liang , Qing Lin , Huaxuan Liu , Jianglai Liu , Wolfgang Lorenzon , Yugang Ma , Yajun Mao , Kaixuan Ni , Xiangxiang Ren , Michael Schubnell , Manbin Shen , Fang Shi , Hongwei Wang , Jiming Wang , Meng Wang , Qiuhong Wang , Siguang Wang , Xuming Wang , Zhou Wang , Shiyong Wu , Xiang Xiao , Pengwei Xie , Binbin Yan , Yong Yang , Jianfeng Yue , Xionghui Zeng , Hongguang Zhang , Hua Zhang , Huanqiao Zhang , Tao Zhang , Li Zhao , Jing Zhou , Ning Zhou , Xiaopeng Zhou

TREX-DM: a low background Micromegas-based TPC for low mass WIMP detection

Dark Matter experiments are recently focusing their detection techniques in low-mass WIMPs, which requires the use of light elements and low energy threshold. In this context, we present the TREX-DM experiment, a low background…

Instrumentation and Detectors · Physics 2015-11-24 F. J. Iguaz , J. G. Garza , F. Aznar , J. F. Castel , S. Cebrian , T. Dafni , J. A. Garcia , H. Gomez , D. Gonzalez-Diaz , I. G. Irastorza , A. Lagraba , G. Luzon , A. Peiro , A. Rodriguez