随着发光二极管(Light Emitting Diode,LED)应用需求的增加,对其电子束辐照效应的研究是目前的热点,因此需要设计一个数据获取系统,实时监测发光二极管性能参数在辐照过程中的变化。利用小电流计、功率计、光谱仪、低压电源等设备完成...随着发光二极管(Light Emitting Diode,LED)应用需求的增加,对其电子束辐照效应的研究是目前的热点,因此需要设计一个数据获取系统,实时监测发光二极管性能参数在辐照过程中的变化。利用小电流计、功率计、光谱仪、低压电源等设备完成系统硬件搭建,以Lab VIEW为开发平台完成了对串行通讯接口RS-232、通用串行总线(Universal Serial Bus,USB)和局域网(Local Area Network,LAN)三种接口通信协议的软件实现,并进行数据存储和显示,在局域网内利用远程桌面连接实现远程监测。利用该系统完成了在1.5 Ge V电子束辐照过程中对Ga N光电特性参数和环境参数的实时采集、存储和显示。展开更多
A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight a...A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（IBD） candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ILL＋Vogel） model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.展开更多
文摘随着发光二极管(Light Emitting Diode,LED)应用需求的增加,对其电子束辐照效应的研究是目前的热点,因此需要设计一个数据获取系统,实时监测发光二极管性能参数在辐照过程中的变化。利用小电流计、功率计、光谱仪、低压电源等设备完成系统硬件搭建,以Lab VIEW为开发平台完成了对串行通讯接口RS-232、通用串行总线(Universal Serial Bus,USB)和局域网(Local Area Network,LAN)三种接口通信协议的软件实现,并进行数据存储和显示,在局域网内利用远程桌面连接实现远程监测。利用该系统完成了在1.5 Ge V电子束辐照过程中对Ga N光电特性参数和环境参数的实时采集、存储和显示。
基金Supported in part by the Ministry of Science and Technology of Chinathe United States Department of Energy,the Chinese Academy of Sciences+11 种基金the CAS Center for Excellence in Particle Physicsthe National Natural Science Foundation of Chinathe Guangdong provincial governmentthe Shenzhen municipal governmentthe China General Nuclear Power Groupthe Research Grants Council of the Hong Kong Special Administrative Region of Chinathe MOST and MOE in Taiwanthe U.S.National Science Foundationthe Ministry of Education,Youth and Sports of the Czech Republicthe Joint Institute of Nuclear Research in Dubna,Russiathe NSFC-RFBR joint research programthe National Commission for Scientific and Technological Research of Chile
文摘A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（IBD） candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ILL＋Vogel） model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.
