arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12508physics.ins-dethep-ex
收藏

光学读出识别气体TPC中的低能核反冲

Identification of low energy nuclear recoils in a gas TPC with optical readout

Elisabetta Baracchini, Luigi Benussi, Stefano Bianco, Cesidio Capoccia, Michele Arturo Caponero, Gianluca Cavoto, Andre Cortez, Igor Abritta Costa, Emanuele Di … 展开作者

Elisabetta Baracchini, Luigi Benussi, Stefano Bianco, Cesidio Capoccia, Michele Arturo Caponero, Gianluca Cavoto, Andre Cortez, Igor Abritta Costa, Emanuele Di Marco, Giulia D'Imperio, Giorgio Dho, Fabrizio Iacoangeli, Giovanni Maccarrone, Michela Marafini, Giovanni Mazzitelli, Andrea Messina, Rafael Antunes Nobrega, Aldo Orlandi, Emiliano Paoletti, Luciano Passamonti, Fabrizio Petrucci, Davide Piccolo, Daniele Pierluigi, Davide Pinci, Francesco Renga, Filippo Rosatelli, Alessandro Russo, Giovanna Saviano, Roberto Tesauro, Sandro Tomassini

摘要:

寻找一种新的技术,能够检测和重建的核反冲事件在keV的能量范围内已经变得越来越重要,只要大面积的大质量WIMP类暗物质候选人已被排除在外。具有光学读出的气体时间投影室(TPC)将TPC技术提供的完整事件信息与上一代科学光传感器的高灵敏度和粒度相结合,是非常有前途的候选者。在Frascati国家实验室测试了用气体电子倍增器(GEM)获得的阳极放大TPC。来自放射源的光子和中子被用来诱导反冲原子核和电子,其动能在[1-100] keV范围内。在大气压下使用He-CF 4(60/40)气体混合物,并且通过高位置分辨率和低噪声的科学CMOS相机和光电倍增管获取GEM通道中倍增期间产生的光。本文提出了一种基于改进聚类技术的多阶段模式识别算法。一些集群的形状可观的是用来识别核反冲中子起源于AmBe源对X射线55 Fe光电子。对能量约为6 keV的核反冲的探测效率达到18%,同时获得96%的~(55)Fe光电子抑制。这使得这种光学读出气体TPC作为定向直接暗物质搜索的超稀有事件的未来调查非常有希望的候选者。

英文摘要:

The search for a novel technology able to detect and reconstruct nuclear recoil events in the keV energy range has become more and more important as long as vast regions of high mass WIMP-like Dark Matter candidate have been excluded. Gaseous Time Projection Chambers (TPC) with optical readout are very promising candidate combining the complete event information provided by the TPC technique to the high sensitivity and granularity of last generation scientific light sensors. A TPC with an amplification at the anode obtained with Gas Electron Multipliers (GEM) was tested at the Laboratori Nazionali di Frascati. Photons and neutrons from radioactive sources were employed to induce recoiling nuclei and electrons with kinetic energy in the range [1-100] keV. A He-CF4 (60/40) gas mixture was used at atmospheric pressure and the light produced during the multiplication in the GEM channels was acquired by a high position resolution and low noise scientific CMOS camera and a photomultiplier. A multi-stage pattern recognition algorithm based on an advanced clustering technique is presented here. A number of cluster shape observables are used to identify nuclear recoils induced by neutrons originated from a AmBe source against X-ray 55Fe photo-electrons. An efficiency of 18% to detect nuclear recoils with an energy of about 6 keV is reached obtaining at the same time a 96% 55Fe photo-electrons suppression. This makes this optically readout gas TPC a very promising candidate for future investigations of ultra-rare events as directional direct Dark Matter searches.

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。

↑