论文标题
在7BE中寻找7BE中电子捕获的已发表数据的分析，以寻找800 KEV以下的质量中微子
Analysis of published data of electron capture in 7Be in the search for a heavy neutrino in the mass range under 800 keV
论文作者
论文摘要
我们对$^7 $中电子捕获的实验数据进行了重新分析，该数据由其他作者发表。我们的目标是将上微子的混合物与150--800 KEV质量范围内的右手中微子设置上中微子的混合物。在已发表的实验中，测量了20--200 EV范围内的$^7 $ LI后坐力能量谱。如果电子捕获并发射重中微子，应将后坐力光谱转移到较低的能量。我们搜索具有与主K壳过渡峰具有相同能量宽度的额外高斯形结构。为此，我们将已发布的光谱曲线数字化，找到能量分辨率，以约3个能量分辨率的3 sigma的能量间隔计算事件的移动总和。然后，我们使用此总和的统计误差在一定级别排除外观峰的外观。最后，我们在电子中微子上以95 \％的置信度（重中微子混合元件，$ u^2 $）呈现上限的上限。新的上限至少比300--800 KEV质量范围的现有数据低一个数量级。
We present a reanalysis of the experimental data of electron capture in $^7$Be embedded in Ta which have been published by other authors. Our goal is to set upper limits on a mixture of electron neutrino with a possible right-handed heavy neutrino in the 150--800 keV mass range. In the published experiment a $^7$Li recoil energy spectrum in the 20--200 eV range was measured. In case of electron capture with emission of a heavy neutrino, the recoil spectrum should be shifted to the lower energies. We search for an additional Gauss-shaped structure with the same energy width as the main K-shell transition peak. For this we digitize the published spectrum curve, find the energy resolution, calculate the moving sum of the events along the spectrum in the energy interval of about 3 sigma of energy resolution. Then we use the statistical error of this sum to exclude at some level the appearance of an additional peak. Finally, we present the upper limits at a 95\% confidence level on electron neutrino -- heavy neutrino mixing element, $U^2$, in the mass matrix. New upper limits are at least one order of magnitude lower than the existing data in 300--800 keV mass range.
