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Design and fabrication of superconducting HEB mixer

Chinese Science Bulletin 2009年第12期54卷 2013-2017页

作者： wang jinping li yangbin kang lin wang yu zhong yangyin liang min chen jian cao chunhai xu weiwei wu peiheng Research Institute of Superconductor Electronics (RISE) Deptartment of Electronic Science and Engineering Nanjing UniversityNanjing 210093 China

This paper describes the design and fabrication of superconducting hot electron bolometer (HEB) mixer based on ultra-thin superconducting NbN films. The high quality films were epitaxially grown on high resistance Si substrates. The device was fabricated by magnetron sputtering, electron beam lithography (EBL), reactive ion etching (RIE), lithography, and so on. The device's resistance-tempera-ture (R-T) curves and current-voltage (I-V) curves were studied. The results of THz response of the device are presented. Y-factor technique was used to measure the device's noise temperature. When the device was irradiated with a laser radiation of 2.5 THz, the obtained lowest noise temperature of the device was 2213 K.

关键词：超导制造混合器反应离子刻蚀测辐射热计反应装置薄膜外延生长光刻技术

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Searching for^(76)Ge neutrinoless double beta decay with the CDEX-1B experiment

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Chinese Physics C 2024年第10期48卷 11-22页

作者： Bing-Tao Zhang Jun-Zheng wang li-Tao Yang Qian yue Ke-Jun kang yuan-Jing li Hai-Peng An C.Greeshma jian-Ping Chang yun-Huan chen jian-Ping cheng Wen-Han Dai Zhi Deng Chang-Hao Fang Xin-Ping Geng Hui Gong Qiu-Ju Guo xu-yuan Guo li He Sheng-ming He Jin-Wei Hu Han-Xiong Huang Tu-chen Huang Hai-Tao Jia Xi jiang S.Karmakar Hao-Bin li jian-min li Jin li Qian-yun li Ren-ming-Jie li xue-Qian li yu-Lan li Yi-Fan liang Bin liao Fong-Kay lin Shin-Ted lin Jia-xuan liu Shu-Kui liu Yan-Dong liu yu liu yuan-yuan liu zhong-Zhi liu Hao Ma yu-Cai Mao Qi-yuan Nie Jin-Hua Ning Hui Pan Ning-Chun Qi Jie Ren Xi-Chao Ruan Ze She Manoj Kumar Singh Tian-Xi Sun Chang-jian Tang Wei-You Tang Yang Tian Guang-Fu wang li wang Qing wang yu-Feng wang yun-Xiang wang Henry-Tsz-King Wong Shi-Yong wu yu-cheng wu Hao-Yang Xing Rui xu Yin xu Tao xue yu-Lu Yan Nan Yi Chun-xu yu Hai-Jun yu jian-Feng yue ming Zeng Zhi Zeng Feng-Shou Zhang Lei Zhang Zhen-Hua Zhang Zhen-yu Zhang kang-kang Zhao ming-Gang Zhao Ji-Fang Zhou Zu-Ying Zhou Jing-Jun Zhou Key Laboratory of Particle and Radiation Imaging(ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084 Department of Physics Tsinghua UniversityBeijing 100084 Institute of Physics Academia SinicaTaipei 11529 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875 College of Physics Sichuan UniversityChengdu 610065 School of Physics Peking UniversityBeijing 100871 Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413 Sino-French Institute of Nuclear and Technology Sun Yat-sen UniversityZhuhai 519082 School of Physics Nankai UniversityTianjin 300071 Department of Physics Banaras Hindu UniversityVaranasi 221005 Department of Physics Beijing Normal UniversityBeijing 100875

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(0νββ)decay of^(76)Ge.A total of 504.3 kg⋅day effective exposure data was *** anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was *** lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1/2)^(0ν)>1.0×10^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<3.2–7.5 eV.

关键词： neutrinoless double beta decay CDEX point-contact germanium detector ^(76)Ge

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