Speaker
Dr
Yoomin Oh
(Institute for Basic Science)
Description
The existence of sterile neutrinos may explain the discrepancy between the recent calculation and experimental measurements for the reactor anti-neutrino flux. The sterile neutrino can be searched by measuring the distortion of the anti-neutrino energy spectrum at a very short distance from the reactor core. NEOS, Neutrino Experiment for Oscillation at Short Baseline, measured the anti-neutrino energy spectrum at 24m baseline, in the tendon gallery of a 3 GW$_{\textrm{th}}$ commercial reactor in Yeonggwang, South Korea. A homogeneous target with 0.5% Gd doped liquid scintillator was used to detect e+ and neutron coincidence from the inverse beta decay. The experiment has taken data for about 8 months, reactor off for 2 months and reactor on for the last 6 months. We observed about 2,000 IBD events per day with the signal to background ratio 20. We also observed the energy spectrum discrepancy around 5 MeV between the calculation and experimental data for the first time in the short baseline reactor experiments, as in the $\theta_{13}$ experiments. In this talk, we will present the sterile neutrino search with our data sample.
Primary author
Dr
Yoomin Oh
(Institute for Basic Science)
Co-authors
Mr
Baro Kim
(Chonnam National University)
Dr
Bo-Young Han
(Korea Atomic Energy Research Institute)
Dr
Eunju Jeon
(Institute for Basic Science)
Dr
Gwang-Min Sun
(Korea Atomic Energy Research Institute)
Prof.
Hongjoo Kim
(Kyungpook National University)
Dr
HyangKyu Park
(Institute for Basic Science)
Prof.
Hyunsoo Kim
(Sejong University)
Dr
Jaison Lee
(Institute for Basic Science)
Mr
Jinyu Kim
(Sejong University)
Mr
Jooyoung Lee
(Kyungpook National University)
Dr
Kang Soon Park
(Institute for Basic Science)
Prof.
Kim Siyeon
(Chung-Ang University)
Dr
Kyungju Ma
(Sejong University)
Dr
Kyungkwang Joo
(Chonnam National University)
Mr
Kyungmin Seo
(Sejong University)
Dr
Moo Hyun Lee
(Institute for Basic Science)
Dr
Yeongduk Kim
(Sejong University)
Mr
Youngju Ko
(Chung-Ang University)
