论文标题
kg尺度pbwo $ _4 $低温检测器的放射性探测器，用于res-nova实验
Radiopurity of a kg-scale PbWO$_4$ cryogenic detector produced from archaeological Pb for the RES-NOVA experiment
论文作者
论文摘要
Res-Nova是一种新提出的实验，用于使用由PBWO $ _4 $ crystals制成的一系列低温探测器来检测天体物理源（主要是超新星）的中微子。这种具有内在高放射性的非常规的材料使中微子检测到通过相干弹性弹性中微子核散射（CE $ν$ ns），可以在感兴趣的中微子检测区域中实现低背景水平（CE $ NS）。该信号位于检测器能阈值O（1 KEV），预计它会被晶体吸收剂的自然放射性污染物所隐藏。在这里，我们在0.84 kg pbwo $ _4 $ crystal上介绍了由考古PB产生的晶体的结果，该结果作为低温检测器。水晶内部放射性污染物为：$^{232} $ <$ 40 $ 40 $μ$ bq/kg，$^{238} $ <$ u $ <$ 30 $ 30 $μ$ $ bq/kg，$^{226} $ ra 1.3 mbq/kg和$^mbq/kg and $^{210} $ pb 22.5 mbq/kg。我们还提供了最终实验的背景预测，以及可能进行进一步抑制的缓解策略。所达到的结果表明，实现这一新的探测器的可行性。
RES-NOVA is a newly proposed experiment for the detection of neutrinos from astrophysical sources, mainly Supernovae, using an array of cryogenic detectors made of PbWO$_4$ crystals produced from archaeological Pb. This unconventional material, characterized by intrinsic high radiopurity, enables to achieve low-background levels in the region of interest for the neutrino detection via Coherent Elastic neutrino-Nucleus Scattering (CE$ν$NS). This signal lies at the detector energy threshold, O(1 keV), and it is expected to be hidden by naturally occurring radioactive contaminants of the crystal absorber. Here, we present the results of a radiopurity assay on a 0.84 kg PbWO$_4$ crystal produced from archaeological Pb operated as a cryogenic detector. The crystal internal radioactive contaminations are: $^{232}$Th $<$40 $μ$Bq/kg, $^{238}$U $<$30 $μ$Bq/kg, $^{226}$Ra 1.3 mBq/kg and $^{210}$Pb 22.5 mBq/kg. We present also a background projection for the final experiment and possible mitigation strategies for further background suppression. The achieved results demonstrate the feasibility of realizing this new class of detectors.
