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New detector system to measure (n,γ) reaction cross section precisely in China
neutron capture reaction BaF2 crystal 4π γ total absorption facility (GTAF) time of flight technology (TOF technology)
2009/8/14
Based on the urgent requirement of the (n,γ) reaction cross-section in the energy range of keV~MeV, 4π gamma total absorption facility (GTAF) is being constructed at China Institute of Atomic Energy ...
Monte Carlo studies of micromegas as a neutron detector and its track reconstruction
simulation neutron detector track reconstruction
2009/8/14
In this paper a two dimensional readout micromegas detector with a polyethylene foil as converter was simulated on GEANT4 toolkit and GARFIELD for fast neutron detection. A new track reconstruction me...
Steady state investigation on neutronics of a molten salt reactor considering the flow effect of fuel salt
MSR steady state neutronics flow effect delayed neutron precursors
2009/8/14
The Molten Salt Reactor (MSR), one of the `Generation IV' concepts, is a liquid-fuel reactor, which is different from the conventional reactors using solid fissile materials due to the flow effect of...
Studies of the aperture design and its pointing precision in fast neutron penumbral imaging
inertial confined fusion neutron penumbral imaging classical molecular dynamics method
2009/8/14
Neutron penumbral imaging technique is an important diagnosis method in Inertial Confined Fusion, and the design of the aperture shape will affect the resolution of the imaging system. In this paper, ...
Simulation of a modified neutron detector applied in CSNS
rem counter high energy neutrons response function FLUKA
2009/8/14
We simulate the response of a modified Anderson-Braun rem counter in the energy range from thermal energy to about 10 GeV using the FLUKA code. Also, we simulate the lethargy spectrum of CSNS outside ...
Some progress in research on octupole deformation around Z=56, N=88 nuclei
high spin states octupole deformation neutron-rich nucleus
2009/8/14
Recent progress in research on octupole deformation around Z=56, N=88 neutron-rich nuclei by our cooperative groups of Tsinghua University, Vanderbilt University and Lawrence Berkeley National Labora...
Source of raw material of the pottery warriors in Qinshihuang Mausoleum pits K0006 and K0007
neutron activation analysis fuzzy cluster analysis pottery warriors of Qinshihuang Mausoleum the source of raw material
2009/8/14
The paper selects 15 samples of the pottery warriors in Qinshihuang Mausoleum Pit K0006, 21 samples of pottery warriors in Qinshihuang Mausoleum Pit K0007 and 75 samples of clay nearby Qinshihuang mau...
Study on spatial resolution of micromegas as a neutron detector under condition of high neutron flux and γ ray background
micromegas neutron detection GEANT4 spatial resolution γ sensitivity
2009/8/14
In this paper Micromegas has been designed to detect neutrons. The simulation of the spatial resolution of Micromegas as neutron detector is carried out by GEANT4 toolkit. The neutron track reconstruc...
Superfluidity in neutron matter and symmetric nuclear matter and the effect of a microscopic three-body force
neutron matter symmetric nuclear matter superfluidity three-body force BCS theory BHF approach
2009/8/14
The neutron 3PF2 pairing gap in pure neutron matter, neutron 3PF2 gap and neutron-proton 3SD1 gap in symmetric nuclear matter have been studied by using the Brueckner-Hartree-Fock(BHF) approach and th...
SSRF前端区锯齿墙束流孔洞中子屏蔽的蒙特卡罗估算
MCNP EGSnrc 中子辐射屏蔽 同步辐射 SSRF
2009/8/14
主要关于上海同步辐射装置(SSRF)储存环电子引发产生的韧致辐射和中子辐射的研究. 中子和光子经多种组合材 料(厚度在5cm～115cm之间)屏蔽后的剂量特征由蒙特卡罗代码MCNP和EGSnrc估算得到; 蒙特卡罗计算表明, 单一的材料如铅, 铁和聚乙烯对高能中子是无效的生物屏蔽材料, 而组合材料如铅或者铁加聚乙烯和铅或者铁加混凝土被认为是屏蔽高能中子很好的组合材料. 铅铁等高Z材料加点包含有氢的...
Three-body model for neutron-halo nuclei
neutron-halo nuclei three-body model Faddeev equation
2009/8/13
The neutron-halo nuclei, 11Li, 14Be, and 17B, are studied in the three-body model. The Yukawa interaction is used to describe the interaction of the two-body subsystem. For given parameters of the two...
The β-delayed neutron and γ spectra of neutron-rich nucleus 21N using β-γ and β-n coincidence measurements were presented in this paper. Thirteen new neutron groups ranging from 0.28 MeV to 4.98 MeV a...
报道了在13.5－14.6MeV中子能区用活化法测得的112Sn(n,2n)111Sn,118Sn(n,2n)117Sn 和 124Sn(n,2n)123mSn的反应截面值. 中子注量用93Nb(n, 2n)92mNb或27Al(n,α)24Na反应截面得到.单能中子由T(d, n)4He反应获得. 同时还列举了已收集到的文献值以作比较.
道辐射俘获截面的相干增强现象
热中子 相干增强 道辐射俘获截面
2009/8/13
40Ca的热中子辐射俘获截面实验值远较统计理论及Lane-Lynn直接俘获理论预言的截面值大. 本文指出, 这是一个位阱俘获与价俘获的干涉增强效应的例子. 使用普适的光学模型位阱并考虑了这一干涉效应, 计算了40Ca的热中子辐射俘获截面、散射截面和41Ca的p3/2中子束缚能, 并与实验值进行了比较.