Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor
Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor
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ILL 研究核反应堆未来跳弹实验的快中子背景特征
DOI：
10.1140/epjc/s10052-022-11150-x
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cazes, A.
中科院分区：
文献类型：
--
作者：
Augier, C.;Baulieu, G.;Belov, V.;Berge, L.;Billard, J.;Bres, G.;Bret, J-. L.;Broniatowski, A.;Calvo, M.;Cazes, A.
未来的中微子实验旨在通过提供低至100 eV核反冲能量范围的相干弹性中微子核散射（CENNS）过程的高精度测量来寻找电弱领域的新物理。该实验将部署一个kg级低能量阈值探测器阵列，结合Ge和Zn目标晶体，距离法国格勒诺布尔Laue Langevin研究所（ILL）的58兆瓦研究核反应堆堆芯8.8 m。目前，icochetcollaboration正在对未来实验场地的背景进行表征，以优化实验的屏蔽设计。最具威胁性的背景成分是由kv级中子诱导的核反冲组成的，它不能被粒子识别主动拒绝。这些最初的快中子是由反应堆堆芯和周围的实验（反应物）产生的，以及由宇宙射线在周围材料中产生初级中子和介子诱导的中子产生的。在本文中，我们使用对热中子、超热中子和快中子具有高灵敏度的he比例计数器提出了icochetneutron背景表征。我们将这些测量结果与theRicochetGeant4模拟结果进行比较，以验证我们的核源性和宇宙源性中子背景估计。最后，我们提出了我们对未来铯原子实验的中子背景估计以及由此产生的CENNS探测意义。我们的结果表明，根据μ子否决权的有效性，我们预计在CENNS感兴趣的区域，即在50 eV和1 keV之间，总核后坐力背景率在44±3和9±2事件/天/kg之间。因此我们发现，当只考虑极限中子背景时，对于一个反应堆循环后的CENNS检测，theRicochetexperiment应该达到4.6 ~ 13.6的统计显著性。
The futureRicochetexperiment aims at searching for new physics in the electroweak sector by providing a high precision measurement of the Coherent Elastic Neutrino-Nucleus Scattering (CENNS) process down to the sub-100 eV nuclear recoil energy range. The experiment will deploy a kg-scale low-energy-threshold detector array combining Ge and Zn target crystals 8.8 m away from the 58 MW research nuclear reactor core of the Institut Laue Langevin (ILL) in Grenoble, France. Currently, theRicochetCollaboration is characterizing the backgrounds at its future experimental site in order to optimize the experiment’s shielding design. The most threatening background component, which cannot be actively rejected by particle identification, consists of keV-scale neutron-induced nuclear recoils. These initial fast neutrons are generated by the reactor core and surrounding experiments (reactogenics), and by the cosmic rays producing primary neutrons and muon-induced neutrons in the surrounding materials. In this paper, we present theRicochetneutron background characterization usingHe proportional counters which exhibit a high sensitivity to thermal, epithermal and fast neutrons. We compare these measurements to theRicochetGeant4 simulations to validate our reactogenic and cosmogenic neutron background estimations. Eventually, we present our estimated neutron background for the futureRicochetexperiment and the resulting CENNS detection significance. Our results show that depending on the effectiveness of the muon veto, we expect a total nuclear recoil background rate between 44 ± 3 and 9 ± 2 events/day/kg in the CENNS region of interest, i.e. between 50 eV and 1 keV. We therefore found that theRicochetexperiment should reach a statistical significance of 4.6 to 13.6for the detection of CENNS after one reactor cycle, when only the limiting neutron background is considered.
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DOI：
10.1063/1.2720459
发表时间：
2007
期刊：
Experimental Methods in The Physical Sciences
影响因子：
--
作者：
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DOI：
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发表时间：
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期刊：
Journal of Physics: Conference Series
影响因子：
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作者：
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DOI：
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发表时间：
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影响因子：
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DOI：
--
发表时间：
2010
期刊：
影响因子：
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作者：
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