在“Troitsk nu-mass”实验中用积分和微分模式的TRISTAN原型探测器系统进行的测量
Measurements with a TRISTAN prototype detector system at the "Troitsk nu-mass" experiment in integral and differential mode
摘要：
不育中微子出现在标准模型的最小扩展中，它可以解决天体粒子物理学中的一些悬而未决的问题。例如，keV质量范围内的无菌中微子是可行的暗物质候选者。它们的存在会导致氚$β$衰变谱的扭结状畸变。在这项工作中，我们报告的仪器的Troitsk nu质量实验与7像素TRISTAN原型探测器和测量的微分和积分模式。这两种模式的结合是精确的无菌中微子搜索的关键要求，因为这两种方法都倾向于很大程度上不同的系统不确定性。由于TRISTAN探测器在高速率下的出色性能，可以进行高达约6 keV质量的无菌中微子搜索，这将以前可访问的质量范围扩大了3倍。给出了质量范围< 5.6 keV（微分）和< 6.6 keV（积分）的中微子混合振幅的上限。这些结果表明，在升级KATRIN实验的最后TRISTAN探测器和读出系统的计划中，无菌中微子搜索是可行的。
英文摘要：
Sterile neutrinos emerge in minimal extensions of the Standard Model which can solve a number of open questions in astroparticle physics. For example, sterile neutrinos in the keV-mass range are viable dark matter candidates. Their existence would lead to a kink-like distortion in the tritium $β$-decay spectrum. In this work we report about the instrumentation of the Troitsk nu-mass experiment with a 7-pixel TRISTAN prototype detector and measurements in both differential and integral mode. The combination of the two modes is a key requirement for a precise sterile neutrino search, as both methods are prone to largely different systematic uncertainties. Thanks to the excellent performance of the TRISTAN detector at high rates, a sterile neutrino search up to masses of about 6 keV could be performed, which enlarges the previous accessible mass range by a factor of 3. Upper limits on the neutrino mixing amplitude in the mass range < 5.6 keV (differential) and < 6.6 keV (integral) are presented. These results demonstrate the feasibility of a sterile neutrino search as planned in the upgrade of the KATRIN experiment with the final TRISTAN detector and read-out system.
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