未来Ricochet实验在不良研究核反应堆上的快速中子背景表征

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未来Ricochet实验在不良研究核反应堆上的快速中子背景表征

Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor

论文作者

Augier, C., Baulieu, G., Belov, V., Berge, L., Billard, J., Bres, G., Bret, J. -L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. -B., Formaggio, J. A., Fuard, S., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Guy, E., Harrington, P., Heine, S. T., Hertel, S. A., Heusch, M., Hirjibehedin, C. F., Hong, Z., Ianigro, J. -C., Jin, Y., Johnston, J. P., Juillard, A., Karaivanov, D., Kazarcev, S., Lamblin, J., Lattaud, H., Li, M., Lubashevskiy, A., Marnieros, S., Mayer, D. W., Minet, J., Misiak, D., Mocellin, J. -L., Monfardini, A., Mounier, F., Oliver, W. D., Olivieri, E., Oriol, C., Patel, P. K., Perbet, E., Pinckney, H. D., Poda, D., Ponomarev, D., Rarbi, F., Real, J. -S., Redon, T., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Sanglard, V., Schmidt, B., Shevchik, Ye., Sibille, V., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Pontseele, W., Vezzu, F., Weber, S., Winslow, L., Yakushev, E., Zinatulina, D.

论文摘要

未来的Ricochet实验旨在通过对相干弹性中微子核散射（CENN）过程进行高精度测量，从而搜索电动部门中的新物理学。该实验将部署一个kg尺度的低能阈值检测器阵列，将GE和Zn靶晶体结合起来，距法国格伦布尔的58 MW研究核反应堆核心8.8米。目前，Ricochet协作正在表征其未来实验站点的背景，以优化实验的屏蔽设计。最有威胁性的背景成分不能被粒子识别积极拒绝，由KEV尺度中子诱导的核路后座组成。这些初始的快速中子是由反应堆核心和周围实验（反应遗传学）以及在周围材料中产生原发性中子和Muon诱导的中子的宇宙射线产生的。在本文中，我们使用$^3 $ HE比例计数器介绍了Ricochet中子背景表征，该计数器对热，上皮和快速中子具有很高的敏感性。我们将这些测量值与Ricochet Geant4模拟进行了比较，以验证我们的反应生成和宇宙基因中子背景估计。最终，我们介绍了未来Ricochet实验的估计中子背景以及由此产生的CENN检测显着性。

The future Ricochet experiment 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 meters away from the 58 MW research nuclear reactor core of the Institut Laue Langevin (ILL) in Grenoble, France. Currently, the Ricochet collaboration 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 the Ricochet neutron background characterization using $^3$He proportional counters which exhibit a high sensitivity to thermal, epithermal and fast neutrons. We compare these measurements to the Ricochet Geant4 simulations to validate our reactogenic and cosmogenic neutron background estimations. Eventually, we present our estimated neutron background for the future Ricochet experiment and the resulting CENNS detection significance.

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