arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1604.01587physics.ins-detnucl-ex
收藏

TeO $_{2}$低温量热计切伦科夫光发射模型

Model for the Cherenkov light emission of TeO$_{2}$ cryogenic calorimeters

Nicola Casali

摘要:

能够探测中微子的马约拉纳性质并发现轻子数破坏的最灵敏的过程是无中微子双β衰变。由于具有出色的能量分辨率、效率和固有的放射性纯度,低温量热仪是研究这一过程的首选。一种能够提高当前实验灵敏度的新方法是拒绝代表主要背景源的$α$相互作用。在TeO $_2$量热计中,$α$粒子可以被标记,因为与电子相反,它们不发射切伦科夫光。然而,检测到的非常少量的切伦科夫光破坏了对$α$背景的完全抑制。在本文中,我们比较了在以前的测量TeO $_2$光产额与一个详细的蒙特卡罗模拟能够再现的数量的切伦科夫光子产生的$β/γ$相互作用的热量计和它们的传播在实验装置中。我们证明,从$5\times5\times5$ ~cm $^{3}$ TeO $_2$测辐射热计检测的光输出可以增加高达60%,通过增加晶体的表面粗糙度和改进光探测器的设计。此外,我们研究了解开$α$,$β$和$γ$相互作用的可能性,这代表了最终的背景源。不幸的是,$γ$抑制是不可行的,但是$α$抑制可以利用高灵敏度光检测器来实现。

英文摘要:

The most sensitive process able to probe the Majorana nature of neutrinos and discover Lepton Number Violation is the neutrino-less double beta decay. Thanks to the excellent energy resolution, efficiency and intrinsic radio-purity, cryogenic calorimeters are primed for the search for this process. A novel approach able to improve the sensitivity of the current experiments is the rejection of $α$ interactions, that represents the dominant background source. In TeO$_2$ calorimeters, $α$ particles can be tagged as, in contrast to electrons, they do not emit Cherenkov light. Nevertheless, the very low amount of detected Cherenkov light undermines the complete rejection of $α$ background. In this paper we compare the results obtained in previous measurements of the TeO$_2$ light yield with a detailed Monte Carlo simulation able to reproduce the number of Cherenkov photons produced in $β/γ$ interactions within the calorimeter and their propagation in the experimental set-up. We demonstrate that the light yield detectable from a $5\times5\times5$~cm$^{3}$ TeO$_2$ bolometer can be increased by up to 60% by increasing the surface roughness of the crystal and improving the light detector design. Moreover, we study the possibility to disentangle $α$, $β$ and $γ$ interactions, which represent the ultimate background source. Unfortunately $γ$ rejection is not feasible but $α$ rejection can be achieved exploiting high sensitivity light detectors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑