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arXiv 1901.04746hep-phnucl-exnucl-th
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利用反应堆反中微子对无菌中微子混合的灵敏度

Sensitivity to sterile neutrino mixing using reactor antineutrinos

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

备注：
10 pages, 11 figures; Published in Eur.Phys.J. C 79, 86 (2019)
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摘要：

反应堆反中微子被用来精确测量3-中微子模型中的振荡参数，也被用来研究3 $+$ 1中微子框架中的活动-无菌中微子混合灵敏度。本文研究了利用反应堆产生的电子反中微子（$\overlineν_e$）在印度闪烁体反中微子实验装置（ISMRAN）中寻找无菌中微子的可行性。所谓的3 $+$ 1方案被认为是活跃的无菌中微子混合，这导致预计排斥曲线的无菌中微子质量和混合角平面。考虑反应器和检测器相关参数进行分析。结果表明，利用热功率为100 MW $_{th}$的DHRUVA反应堆产生的中微子，在90 $\%$置信水平下，ISMRAN装置可以观测到$\sin^{2}2θ_{14} \geq$ 0.064和$Δm^{2}_{41}$ = 1.0 eV $^2$的活动-无菌中微子混合灵敏度。还观察到，通过将ISMRAN探测器装置放置在距离热功率为1250 MW的紧凑型原型快增殖堆（PFBR）设施20 m处，在相同的$Δm^{2}_{41}$下，活性无菌中微子混合参数$\sin^{2}2θ_{14}$显着改善至$\sim$ 0.03 $_{th}$。

英文摘要：

The reactor antineutrinos are used for the precise measurement of oscillation parameters in the 3-neutrino model, and also used to investigate active-sterile neutrino mixing sensitivity in the 3$+$1 neutrino framework. In the present work, we study the feasibility of sterile neutrino search with the Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up using electron antineutrinos ($\overlineν_e$) produced from reactor as a source. The so-called 3$+$1 scenario is considered for active-sterile neutrino mixing, which leads to projected exclusion curves in the sterile neutrino mass and mixing angle plane. The analysis is performed considering both the reactor and detector related parameters. It is found that, the ISMRAN set-up can observe the active-sterile neutrino mixing sensitivity for $\sin^{2}2θ_{14} \geq$ 0.064 and $Δm^{2}_{41}$ = 1.0 eV$^2$ at 90$\%$ confidence level for an exposure of 1 ton-year by using neutrinos produced from the DHRUVA reactor with thermal power of 100 MW$_{th}$. It is also observed that, there is a significant improvement of the active-sterile neutrino mixing parameter $\sin^{2}2θ_{14}$ to $\sim$ 0.03 at the same $Δm^{2}_{41}$ by putting the ISMRAN detector set-up at a distance of 20 m from the compact proto-type fast breeder reactor (PFBR) facility with thermal power of 1250 MW$_{th}$.

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