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1.
The small angle neutron scattering (SANS) instrument is presently being constructed at Chinese Spallation Neutron Source (CSNS) in China, and the biological shielding design is needed to prevent the instrument from causing excessive dose rates in accessible locations. In this paper, the study of shielding design for SANS that relies on Monte Carlo simulation is introduced. Beam line shielding calculations are performed considering both scenarios of closed versus open T0 chopper. The basic design scheme of the beam stop is discussed. The size of the T0 chopper rotor is also estimated.  相似文献   
2.
随着信息技术的突飞猛进,传统教学模式突显其方法单一、手段陈旧、效率低等不适应性.本文提出了一整套大学物理实验智能化教学的新模式:线上预习,门禁把关,实验课堂引入手机互动,实验报告智能分类处理,实验室智能开放等,使慕课、智能手机等信息化技术在教学过程中发挥作用,以灵活多样的考核制度激发学生自主学习的积极性.经过一年的实践,本构想中的很多内容得到了有效实施,在提升自主学习能力方面,收到了较为理想的效果.  相似文献   
3.
杨丽桃  李浩斌  岳骞  康克军  程建平  李元景  王子敬  M.Agartioglu  安海鹏  常建平  陈景瀚  陈云华  邓智  杜强  宫辉  何力  胡津纬  胡庆东  黄瀚雄  贾历平  江灏  李红  李荐民  李金  李霞  李学潜  李玉兰  林枫凯  林兴德  刘书魁  刘仲智  马豪  马菁露  潘辉  任杰  阮锡超  B.Sevda  Vivek Sharma  申满斌  Lakhwinder Singh  Manoj Kumar Singh  唐昌建  唐维优  田阳  王继敏  王力  王青  王轶  吴世勇  吴玉成  幸浩洋  徐音  薛涛  杨松伟  易难  喻纯旭  于海军  岳剑峰  曾雄辉  曾鸣  曾志  张云华  赵明刚  赵伟  周济芳  周祖英  朱敬军  朱忠华 《中国物理C(英文版)》2018,(2)
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.  相似文献   
4.
We give a brief discussion on the measurement of the cross section for D^-D production around the ψ(3770) resonance, and point out a new calculation of the cross sections based on the absolute measurements. Compared with single tag and double tag analyses, the new calculation provides us with many more opportunities to perform the cross section measurement.  相似文献   
5.
研究了CsI(Tl)晶体在1.3GeV e束形成的电磁辐射场和60Co γ辐射场照射后的辐照损伤,测量了晶体光输出和透射率的变化,以及辐射损伤的自然恢复和加热恢复效应.  相似文献   
6.
An inbuilt compound target composed of carbon and tungsten is designed, and optimized by realistic GEANT4 Monte Carlo simulation. Also, we do a Monte Carlo study for single-pion photoproduction at the target. The results are presented from the simulation of pion yield, angular distribution and spectrum (at θlab, θcm=41°). These efforts are important to the coming measurement of the differential cross section for γ+N→π+N.  相似文献   
7.
描述了北京谱仪桶部簇射计数器(BanelShowerCounter)的改进升级工作,改进后的桶部簇射计数器在能量分辨和位置分辨方面有了明显的提高,经对Bhabha事例进行离线刻度后,能量分辨好于21%,z向位置分辨小于3cm.  相似文献   
8.
周小朋  曾鑫宁  宁旭阳  阿布都沙拉木·阿布都克力木  陈葳  谌勋  陈云华  程晨  崔祥仪  樊英杰  方德清  符长波  付孟婷  耿立升  Karl Giboni  顾琳慧  郭绪元  韩柯  何昶达  黄迪  黄焱  黄彦霖  黄周  季向东  巨永林  李帅杰  刘华萱  刘江来  芦晓盈  马文博  马余刚  冒亚军  孟月  倪恺翔  宁金华  任祥祥  商长松  申国防  司琳  谈安迪  王安庆  王宏伟  王萌  王秋红  王思广  王为  王秀丽  王舟  武蒙蒙  吴世勇  邬维浩  夏经铠  肖梦姣  谢鹏伟  燕斌斌  杨继军  杨勇  喻纯旭  袁鞠敏  袁影  张丹  张涛  赵力  郑其斌  周济芳  周宁 《中国物理快报》2021,(1):30-34
We report a search for new physics signals using the low energy electron recoil events in the complete data set from PandaX-Ⅱ,in light of the recent event excess reported by XENON1 T.The data correspond to a total exposure of 100.7 ton·day with liquid xenon.With robust estimates of the dominant background spectra,we perform sensitive searches on solar axions and neutrinos with enhanced magnetic moment.It is found that the axionelectron coupling gAe<4.6×10-12 for an axion mass less than 0.1 keV/c2 and the neutrino magnetic moment μv<4.9×10-11μB at 90%confidence level.The observed excess from XENON1 T is within our experimental constraints.  相似文献   
9.
We present Monte Carlo studies on the singly tagged D mesons, which are crucial in the absolute measurements of D meson decays, based on a full Monte Carlo simulation for the BES-III detector, with the BES-III Offline Software System. The expected detection efficiencies and mass resolutions of the tagged D mesons are well estimated.  相似文献   
10.
研究了CsI(TI)晶体在1.3GeVe-束形成的电磁辐射场和60Coγ辐射场照射后的辐照损伤,测量了晶体光输出和透射率的变化,以及辐射损伤的自然恢复和加热恢复效应。  相似文献   
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