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中子倍增理论应用于碘坑仿真研究
碘坑 中子倍增 船用反应堆 氙毒
2011/8/25
采用中子倍增理论对碘坑仿真进行研究：首先，建立碘坑仿真模型；然后，将碘坑仿真模型对不同初始功率下反应堆突然停堆后的氙毒反应性变化进行计算，并将所得结果与点堆模型进行比较，计算结果表明，碘坑深度和初始功率呈线性关系；最后，将碘坑仿真模型应用于反应堆碘坑内机动性研究。本工作所得结论对反应堆安全分析和控制运行有一定的理论意义和参考价值。
使用蒙特卡罗直接模拟程序计算了弱源点火条件下超瞬发临界5￠的GodivaⅠ快中子脉冲堆缓发中子发射率规律和脉冲引发时刻概率分布。计算结果表明，脉冲引发时刻概率分布的计算结果与实验结果符合较好，所获得的缓发中子发射率规律可合理解释引发时刻概率分布的实验结果。
Comments on arXiv:1011.3046 "Muon Capture Constraints on Sterile Neutrino Properties"
Comments arXiv:Muon Capture Constraints Sterile Neutrino Properties
2011/1/6
It has been very recently reported (McKeen, Pospelov, arXive:1011.3046) that the parameter
region suggested for an explanation of the neutrino oscillation results from the LSND, KARMEN
and MiniBooNE...
In this paper, we investigate the effect of the presence of a quantum gravity induced minimal
length in neutrino oscillation probabilities.
In this paper, we investigate the effect of the presence of a quantum gravity induced minimal
length in neutrino oscillation probabilities. Neutrinos can propagate freely over large distances without...
Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
Itinerant Spin Excitations Inelastic Neutron Scattering
2010/11/23
We report inelastic neutron scattering measurements of the magnetic excitations in SrFe2As2,
the parent of a family of iron-based superconductors. The data extend throughout the Brillouin
zone and u...
Dual-Fermion approach to Non-equilibrium strongly correlated problems
Dual-Fermion Non-equilibrium strongly correlated problems
2010/11/23
We present a generalization of the recently developed dual fermion approach introduced for
correlated lattices to non-equilibrium problems. In its local limit, the approach has been used to devise an...
Limit on Lorentz and CPT violation of the bound Neutron Using a Free Precession 3He/129Xe co-magnetometer
Lorentz CPT violation of the bound Neutron Free Precession 3He/129Xe co-magnetometer
2010/12/20
We report on the search for Lorentz violating sidereal variations of the frequency difference of colocated spin-species while the Earth and hence the laboratory reference frame rotates with respect to...
Parity violation in low energy neutron deuteron scattering
Parity violation low energy neutron deuteron scattering
2011/1/6
Parity violating effects for low energy elastic neutron deuteron scattering are calculated for
DDH and EFT-type of weak potentials in a Distorted Wave Born Approximation, using realistic
hadronic st...
The effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5
pseudogap high energy inelastic neutron
2010/11/18
We have measured the spin fluctuations in the YBa2Cu3O6.5 (YBCO6.5, Tc=59 K) superconductor
at high-energy transfers above 100 meV.Within experimental error, the momentum dependence is
isotropic a...
本工作介绍了大亚湾核电站取消二次中子源的目的及理论计算分析源量程可用性的必要性。研究在缺乏一些重要数据情况下，如何通过数值模拟方法较准确计算出源量程的中子计数率。理论计算方案表明，可通过已有大修装料过程中实际测量所得的源量程中子计数数据，并结合相应的组件燃耗及源强数据来获取近似度因子，并以此校正蒙特卡罗理论计算出的中子通量和中子计数率。通过与实验值进行比较分析，验证了本方法的可行性，并给出与实验较...
Neutron scattering study of a quasi-2D spin-1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure
Neutron scattering study hydrostatic pressure
2010/11/17
We report inelastic neutron scattering study of a quasi-two-dimensional S=1/2 dimer system
Piperazinium Hexachlorodicuprate under hydrostatic pressure. The spin gap becomes softened
with the incre...
Structure and spatial distribution of Ge nanocrystals subjected to fast neutron irradiation
Structure spatial distribution fast neutron irradiation
2010/11/23
The influence of fast neutron irradiation on the structure and spatial distribution of Ge nanocrystals (NC) embedded in an amorphous SiO2 matrix has been studied. The investigation was conducted by me...
We report results of fully non-perturbative calculations, based on Auxiliary Field Quan-tum Monte Carlo (AFQMC) approach, for the dilute neutron matter at the density = 0.003 fm−3. Fundamental...
New Physics with MeV Neutrino Sources Brighter than a Thousand Suns
New Physics MeV Neutrino Sources Brighter Thousand Suns
2011/1/5
Short baseline oscillations of neutrinos (νe and ṽe) due to active-sterile (a-s) mixing can be observed explicitly using MeV ν beams and existing/planned ν detectors.
