Gamma-ray production in neutral-current neutrino-oxygen interactions at energies above 200 MeV
Artur M. Ankowski, Omar Benhar, Takaaki Mori, Ryuta Yamaguchi, Makoto Sakuda
备注：
Invited paper to NUFACT 11, XIIIth International Workshop on Neutrino Factories, Super beams and Beta beams, 1-6 August 2011, CERN and University of Geneva
We report the results of a calculation of the neutrino- and antineutrino-induced gamma-ray production cross section for oxygen target. Our analysis is focused on the kinematical region of neutrino energy larger than ~200MeV, in which single-nucleon knockout is known to be the dominant reaction mechanism. The numerical results have been obtained using a realistic model of the target spectral function, extensively tested against electron-nucleus scattering data. We find that at neutrino energy 600 MeV the fraction of neutral-current interactions leading to emission of gamma-rays of energy larger than 6 MeV is ~41%, and that the contribution of the p_{3/2} state is overwhelming.
The γ-ray production in neutral-current neutrino oxygen interaction in the energy range above 100 MeV
计算了中性流中微子-氧准弹性相互作用产生γ射线的截面，其中剩余核（15 N * 或15 O *）在分支比为41%时产生能量大于6 MeV的γ射线，称为$ν+\^{16}O \rightarrow ν+p+^{15}N*$或$ν+^{16}O \rightarrow ν+n+^{15}O*$.在200 MeV以上，这个截面超过了非弹性反应产生的伽马射线，$ν+^{16}O->ν+^{16}O*$。在本计算中，$1p_{1/2}, 1p_{3/2} and 1s_{1/2}$态的光谱函数和光谱因子是必不可少的。γ射线的产生主要是由剩余核的$1p_{3/2}$态的退激发所决定的。
Study of the neutrino-oxygen cross sections of the charged-current reaction 16O($\barν_e,e^+$)16N(0 MeV,$2^-$) and the neutral-current reaction 16O($ν,ν$')16O(12.97/12.53 MeV,$2^-$), producing high-energy gamma rays
Electric polarizability of neutral hadrons from dynamical lattice QCD ensembles
我们提出了一个价计算的电极化的中子，中性π介子和中性K介子的两个动态生成的nHYP-三叶草合奏。这些系综的π介子质量分别为227（2）MeV和306（1）MeV，这是极化率研究中使用的最低质量。这是在物理点上确定这些参数的程序的一部分。我们进行了一个高统计计算，使我们能够：（1）进行外推的K介子极化率的物理点，我们发现$α_K =0.269(43)\times10^{-4}$ fm $^{3}$，（2）定量比较我们的中子极化率的结果与预测从$χ$ PT，和（3）分析的依赖性的价和海夸克的质量。K介子极化率随轻夸克质量变化缓慢，外推结果可信度高。
