arXiv 2007.003922020-07-21hep-phnucl-exnucl-thphysics.ins-det

用ISMRAN装置使用反应堆反中微子的活性-无菌中微子混合约束

Active-sterile neutrino mixing constraint using reactor antineutrinos with the ISMRAN set-up

S. P. Behera, D. K. Mishra, L. M. Pant

备注：: 11 pages, 6 figures, Minor text corrections similar to Published version
发表信息：: Phys. Rev. D 102, 013002 (2020)
DOI：: 10.1103/PhysRevD.102.013002

摘要：

在这项工作中，我们提出了一个分析的敏感性，以活跃的无菌中微子混合与印度闪烁体矩阵反应堆反中微子（ISMRAN）的实验设置在很短的基线。在这篇文章中，我们考虑了测量电子反中微子感生事件采用一个单一的探测器，可以放置在一个单一的位置或移动之间的近和远的位置从给定的反应堆堆芯。在后一种情况下提取的结果是独立的反应堆反中微子光谱和检测器相关的系统不确定性的理论预测。我们的分析表明，从在近和远探测器位置的组合进行的测量获得的结果显着改善在更高的$Δm^{2}_{41}$相比，在一个单一的探测器位置的测量获得的。据发现，从100兆瓦$_{th}$功率DHRUVA研究堆堆芯的近，远探测器的位置的最佳组合分别为7米和9米，其中ISMRAN设置可以排除在范围1.4 $eV^{2} \leq Δm^{2}_{41} \leq$ 4.0 $eV^{2}$的反应堆反中微子异常区以及目前的最佳拟合点的活性-无菌中微子振荡参数。在这些探测器位置的组合下，ISMRAN装置可以观察到具有95 $\%$置信水平的活跃无菌中微子振荡，条件是对于1吨-年的曝光，$Δm^{2}_{41}$处的$\sin^{2}2θ_{14}\geq 0.09$ = 1 eV $^{2}$。将探测器放置在距热功率为1250 MW $_{th}$的紧凑型原型快增殖堆堆（PFBR）近、远距离分别为15 m和17 m处，在相同曝光量下，可使活性-无菌中微子混合灵敏度提高约22%.

英文摘要：

In this work, we present an analysis of the sensitivity to the active-sterile neutrino mixing with the Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up at very short baseline. In this article, we have considered the measurement of electron antineutrino induced events employing a single detector which can be placed either at a single position or moved between near and far positions from the given reactor core. Results extracted in the later case are independent of the theoretical prediction of the reactor anti-neutrino spectrum and detector related systematic uncertainties. Our analysis shows that the results obtained from the measurement carried out at a combination of the near and far detector positions are improved significantly at higher $Δm^{2}_{41}$ compared to the ones obtained with the measurement at a single detector position only. It is found that the best possible combination of near and far detector positions from a 100 MW$_{th}$ power DHRUVA research reactor core are 7 m and 9 m, respectively, for which ISMRAN set-up can exclude in the range 1.4 $eV^{2} \leq Δm^{2}_{41} \leq$ 4.0 $eV^{2}$ of reactor antineutrino anomaly region along with the present best-fit point of active-sterile neutrino oscillation parameters. At those combinations of detector positions, the ISMRAN set-up can observe the active sterile neutrino oscillation with a 95$\%$ confidence level provided that $\sin^{2}2θ_{14}\geq 0.09$ at $Δm^{2}_{41}$ = 1 eV$^{2}$ for an exposure of 1 ton-yr. The active-sterile neutrino mixing sensitivity can be improved by about 22\% at the same exposure by placing the detector at near and far distances of 15 m and 17 m, respectively, from the compact proto-type fast breeder reactor (PFBR) facility which has a higher thermal power of 1250 MW$_{th}$.

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摘要：

英文摘要：

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