标题： 在使用Borexino探测器的${^{8}\rm{B}}$衰变中对重态中微子混合的新限制 显示英文标题

标题： New limits on heavy sterile neutrino mixing in ${^{8}\rm{B}}$-decay obtained with the Borexino detector

摘要： 如果质量为$m_{\nu_{H}}\geq$2$ m_e $的重中微子通过质子-质子链的侧分支中的衰变${^8\rm{B}} \rightarrow {^8\rm{Be}} + e^+ + \nu_H$在太阳中产生，它们会可观测地衰变为一个电子、一个正电子和一个轻中微子$\nu_{H}\rightarrow\nu_{L}+e^++e^-$。在本研究中，使用了Borexino的数据来对这类衰变的存在设定限制。我们限制了质量为1.5 MeV$\leq m_{\nu_{H}} \le$14 MeV 的重中微子的混合为$|U_{eH}|^2\leq (10^{-3}-4\times10^{-6})$。这些是比核反应堆和加速器以前实验得到的混合参数更严格的限制。 显示英文摘要

摘要： If heavy neutrinos with mass $m_{\nu_{H}}\geq$2$ m_e $ are produced in the Sun via the decay ${^8\rm{B}} \rightarrow {^8\rm{Be}} + e^+ + \nu_H$ in a side branch of pp-chain, they would undergo the observable decay into an electron, a positron and a light neutrino $\nu_{H}\rightarrow\nu_{L}+e^++e^-$. In the present work Borexino data are used to set a bound on the existence of such decays. We constrain the mixing of a heavy neutrino with mass 1.5 MeV $\leq m_{\nu_{H}} \le$ 14 MeV to be $|U_{eH}|^2\leq (10^{-3}-4\times10^{-6})$ respectively. These are tighter limits on the mixing parameters than obtained in previous experiments at nuclear reactors and accelerators.