Sterile neutrino oscillometry with Jinping
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Regular Article - Theoretical Physics
Sterile neutrino oscillometry with Jinping M. V. Smirnov1,a , Zh. J. Hu1,b , J. J. Ling1,2,c , Yu. N. Novikov3,4 , Z. Wang2,5 , G. Yang6,d 1
School of Physics, Sun Yat-Sen University, Guangzhou 510275, China Key Laboratory of Particle and Radiation Imaging (Tshinghua University), Ministry of Education, Beijing 10084, China 3 Petersburg Nuclear Physics Institute-“Kurchatov Institute”, Gatchina 188300, Russia 4 Saint-Petersburg State University, Peterhof, St. Petersburg 198504, Russia 5 Department of Engineering Physics, Tsinghua University, Beijing 100084, China 6 Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794, USA
2
Received: 31 March 2020 / Accepted: 20 June 2020 © The Author(s) 2020
Abstract The existence of sterile neutrino is an open question in neutrino physics up to now. The method of neutrino oscillometry provides a powerful tool to test the common 3 + 1 sterile neutrino hypothesis, i.e. three active flavors and one sterile flavor. There are several antineutrino sources which can be used for this method. One of them is the well known isotope chain of 144 Ce–144 Pr with initial activity around 50– 100 kCi. It has compact size and might be installed either outside or inside the detector. Another one is the short-lived isotope 8 Li, which can be produced in nuclear reaction of a proton beam hitting a beryllium target. The lithium source has only the out-of-detector option due to its large size. The proposed Jinping water-based liquid scintillator detector will be used as a detection volume. Above experimental setups will allow us to cover the current best fit values of oscillation parameters with 90% C.L. At the same time, it is sensitive to the region of the Neutrino-4 result.
3 Layout of the experiment and numerical analysis 3.1 Experimental setup . . . . . . . . . . . . . 3.1.1 Point-like 144 Ce source . . . . . . . . 3.1.2 IsoDAR . . . . . . . . . . . . . . . . 3.2 Event rate calculation with toy MC . . . . . 3.2.1 A point source like 144 Ce . . . . . . . 3.2.2 IsoDAR . . . . . . . . . . . . . . . . 3.3 Statistical evaluation . . . . . . . . . . . . 3.4 Systematic uncertainties treatment . . . . . 4 Results and discussion . . . . . . . . . . . . . . 5 Conclusion . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . .
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1 Introduction
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It is known that the neutrino is the second most prevalent particle in the Universe. Significant progress has been achieved in neutrino physics in the last two decades. Successful observations of neutrino oscillations have confirmed that neutrinos are massive particles [1]. The majority of experimental results are in good agreement with the theory of threeneutrino oscillations. However several experim
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