用于$^{87}$Rb β谱学和惰性中微子搜索的10 mol%铷掺杂碘化铯晶体的研发
Development of a 10 mol% Rubidium-doped CsI Crystal for $^{87}$Rb Beta-Spectroscopy and Sterile Neutrino Searches
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中文总结 AI 辅助
本研究研发10 mol% Rb掺杂CsI晶体，利用其本征$^{87}$Rb源开展$^{87}$Rb β谱学研究，以搜索keV尺度惰性中微子，为相关研究提供了基础。
中文摘要 AI 辅助
$^{87}$Rb到$^{87}$Sr的三阶禁戒非唯一β衰变（Q$_\beta$=282.275(6) keV）长期以来是理解禁戒β衰变的重要基准。为开展相关研究，我们采用布里奇曼法研发了铷掺杂浓度为10 mol%的新型碘化铯（CsI）闪烁体，掺入的$^{87}$Rb作为本征放射源，实现了源在探测器内的配置，对β衰变产生的低能电子具有高探测效率和极小的能量损失。我们研究了铷掺杂和铊共掺杂的CsI晶体，表征了其闪烁特性，包括光产额、能量分辨率和非线性响应。我们报告了CsI:Rb和CsI:Tl,Rb晶体的不同闪烁特性，光产额分别为1.38±0.01 PE/keV和4.73±0.13 PE/keV。利用测得的$^{87}$Rb β谱，我们通过重中微子质量本征态诱导的类扭 characteristic 畸变，搜索keV尺度的惰性中微子混合。本研究为后续利用铷掺杂CsI晶体开展惰性中微子搜索提供了基础。
英文摘要
The third-forbidden non-unique beta-decay of $^{87}$Rb to $^{87}$Sr (Q$_β= 282.275(6)$ keV) has long served as an important benchmark for understanding forbidden beta-decay. To investigate this, we have developed a novel CsI scintillator with a 10 mol% Rb concentration using the Bridgman method. The incorporated $^{87}$Rb serves as an intrinsic radioactive source, enabling a source-in-detector configuration with high detection efficiency and minimal energy loss for low-energy electrons from beta-decay. We investigated both Rb doped and Tl co-doped CsI crystals and characterized their scintillation properties, including light yield, energy resolution, and non-linear response. We report distinct scintillation characteristics for the CsI:Rb and CsI:Tl,Rb crystals, with light yields of $1.38\pm0.01$ and $4.73\pm0.13$ PE/keV, respectively. Using the measured $^{87}$Rb beta-spectrum, we search for a keV-scale sterile neutrino admixture through the characteristic kink-like distortion induced by a heavy neutrino mass eigenstate. This study provides a basis for future sterile neutrino searches using rubidium doped CsI crystal.
