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Recent Results from RENO Experiment
KAIST Jonghee Yoo
on behalf of the RENO Collaboration 2020-06-25 Neutrino 2020, Chicago, USA
2Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Collaboration
9 Institutions and 40 Physicists Chonnam National University Dongshin University Gwangju Institute of Science and Technology Gyeongsang National University Korea Advanced Institute of Science and Technology Kyungpook National University Seoul National University Seoyeong University Sungkyunkwan University
Reactor Experiment for Neutrino Oscilla5on
● Start of project: 2006
● The first reactor experiment running with both near and far detectors since August 2011
Yonggwang
South Korea
3Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Experimental Setup
Near Detector (120 m.w.e)
Far Detector (450 m.w.e)
1383 m
294 m
Hanbit Nuclear Power Plant Complex 6 Reactor array
2.8GWth/reactor
4
RENO Detectors
● Target (Gd-loaded LS) 16 tons● Gamma catcher (LS) 29 tons ● Buffer (Mineral oil) 64 tons ● Veto (Water) 353 tons
Two idenAcal (near and far) detectors
Detector Calibration
354 (Buffer) + 67 (Veto) 10” PMTs
Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
0 2 4 6 8 100
0.05
0.1
0.15
0.2
0.25
0.3
Energy [MeV]
Prob
abili
ty
an5neutrinosprompt
5
RENO Antineutrino Detection Principle
Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Ethr⌫ =
(mn +mp)2 �m2p
2mp= 1.806MeV
Eprompt = K.E.(e+) + 1.022MeV ' E⌫ � 0.78MeV
Eprompt = K.E.(e+) + 2⇥ (0.511)MeV
p n
Inverse Beta Decay
e+e� ! 2�
n-Gd ! �...
(prompt)
(delayed ~30µs)
6Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Recent Results from RENO
● “Fuel-composition dependent reactor antineutrino yield at RENO” Phys. Rev. Lett. 122, 232501 (2019)
● “Observation of Reactor Antineutrino Disappearance Using Delayed Neutron Capture on Hydrogen at RENO” JHEP04 (2020) 029 - Update of 1500 days data
- The first θ13 measurement in n-H channel ➔ see poster session #56 by Dr. Eunhyang Kwon
● “Search for Sub-eV Sterile Neutrino at RENO” arXiv:2006.07782 (2020) posted at online 14 June 2020 ➔ see poster session #128 by Dr. Jiwoong Seo
● Updated analysis of 2900 days (Aug. 2011 – Feb. 2020) of RENO data - 2200 Days results published at PRL121 (2018) 20, 201801 - Update on Reactor Antineutrino Anomaly (RAA) - Update on θ13 and Δm2 from n-Gd channel - Update on 5 MeV excess (finer bin measurement) ➔ see poster session #62 by Dr. DongHa Lee
7Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Measured Spectra of IBD Prompt Signal
RENO 2900 days (2200 + 700 days) : Aug. 2011 — Feb. 2020 - Clear excess at 5MeV compared to the Huber-Mueller prediction
Near detector live time: 2509 days#IBD candidates: 989,736Background rate: 2.26 ± 0.05 %5 MeV excess rate: 2.50 ± 0.06 %
Far detector live time: 2908 days# IBD candidates: 120,383Background rate: 4.77 ± 0.19 %5 MeV excess rate: 2.26 ± 0.18 %
0.9387 ± 0.0017
Near
Near
Far
Far
0.9368 ± 0.0050
8Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Observed IBD Rate VS Thermal Power
Near
Near
2.722 ± 0.082 % 2.416 ± 0.223 %
Far
Far
9Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
5 MeV Excess VS Thermal Power
10Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Fuel Dependence of the Fractional 5 MeV Excess (2900 Days)
2.5124 ± 0.0609
��2 = 10.33 (3.21�)
Preliminary
11Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Absolute Reactor Neutrino Flux
Reactor Antineutrino Anomaly (RAA)
R = 0.940± 0.001(stat.)± 0.020(sys.) for H-M model
yf = 5.8303± 0.1249(⇥10�43 cm2/fission)IBD yield:R = 0.983± 0.001(stat.)± 0.021(sys.)Data / Prediction: for ILL+Vogel modelF 235 : F 238 : F 239 : F 241 = 0.571 : 0.073 : 0.300 : 0.056Average fission fraction:
Preliminary
12Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Far to Near Prompt Spectra Shape Comparison
RENO 2900 days (Aug. 2011 — Feb. 2019) - Energy dependent disappearance of reactor antineutrinos
Preliminary
13Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Neutrino Oscillation: θ13 and Δm2ee
RENO 2900 days (Aug. 2011 — Feb. 2020)
± 7.0%
± 4.4%
sin2 2✓13 = 0.0892± 0.0044(stat.)± 0.0045(sys.)
|�m2ee| = 2.74± 0.10(stat.)± 0.06(sys.)(⇥10�3eV2)
Preliminary
14Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Neutrino Oscillation: θ13 and Δm232
15Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Neutrino Oscillation: L/E Dependence
P (⌫e ! ⌫e) ' 1� sin2 2✓13 sin2
✓1.27�m2
eeL
E⌫
◆
sin2 2✓13 = 0.0892± 0.0044(stat.)± 0.0045(sys.)
|�m2ee| = 2.74± 0.10(stat.)± 0.06(sys.)(⇥10�3eV2)
Preliminary
16Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO 1500-Days Data n-H Analysis Results
17Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Neutrino Oscillation from n-H Data
Independent measurement of sin22θ13 using 1500 live days n-H data
n-H Data
sin2 2✓13 = 0.086± 0.008(stat.)± 0.014(sys.)�using PDG input: |�m2
ee| = 2.562⇥ 10�3 eV2�
18Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Sterile Neutrino Search
(3+1) Neutrino ModelP (⌫e ! ⌫e) ' 1� sin2 2✓13 sin
2
✓1.27�m2
31L
E⌫
◆� sin2 2✓14 sin
2
✓1.27�m2
41L
E⌫
◆
19Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Sterile Neutrino Search
arXiv: 2006.07782 (posted on 14th June 2020)
2200 Days of RENO Data
Prompt Energy (MeV)1 2 3 4 5 6 7 8
Mea
sure
d / E
xpec
ted
from
Nea
r
0.8
0.9
1
1.1
1.2 2 eV-210× = 5412mΔ 2 eV-310× = 541
2mΔ2 eV-310× = 141
2mΔ = 0.1 assumed14θ22sin
Data predictionνUncertainty of 3
3−10 2−10 1−10 114θ22sin
4−10
3−10
2−10
1−10
1
)2 (e
V⏐
412m
Δ ⏐
RENO 95% C.L.
)σ1±RENO 95% C.L. expectation (
20Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Sterile Neutrino Search
RENO 2200 days
arXiv: 2006.07782 (posted on 14th June 2020)
3−10 2−10 1−10 114θ22sin
4−10
3−10
2−10
1−10
1
)2 (e
V⏐
412m
Δ ⏐RENO 95% C.L.Daya Bay 90% C.L.Bugey 90% C.L. (40m/15m)KARMEN+LSND 95% C.L.NEOS 90% C.L.
(2020)
21Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Summary
● Report updated results using RENO 2900 days data
● Precision measurement of θ13 and |Δmee2|
● Absolute reactor neutrino flux : R = 94.0±2.0 % (for HM)
● Correlation between 5 MeV excess and 235U fission (3.2σ C.L.)
● The first RENO sterile neutrino search results: arXiv:2006.07782
(1) DongHa Lee, “Updated results on reactor antineutrino oscillation amplitude and frequency for 2900 days at RENO” (poster #62)
(2) Jiwoong Seo, “Search for Sterile Neutrinos at RENO” (poster #128)(3) Eunhyang Kwan, “θ13 measurement using data with neutron capture
on hydrogen at RENO” (poster #56)
RENO Poster Presentations in Neutrino 2020
Backup Slides
23Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO 2900-Days Daily IBD Rate
700 days2200 days
Near
Far
Preliminary
Preliminary
24Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Fuel Fraction in the Reactor Core
Preliminary
25Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
Fuel Dependence of IBD Yield
yf = 5.8303± 0.0063⇥ 10�43 cm2/fissionIdentical yieldNull fuel dependence ruled out by 7.7σ
Preliminary
26Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO 2900-Day Data Analysis Update
2.886σ
0.975σ
y239=
4.142+0.250
�0.245 ⇥
10�43cm
2/fission
y235 = 6.155+0.183�0.178 ⇥ 10�43 cm2/fission
Preliminary
27Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO 1500-Days Data n-H Analysis Results
28Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO 1500-Days Data n-H Analysis Results
Independent measurement of sin22θ13 using 1500 live days n-H data
sin2 2✓13 = 0.086± 0.008(stat.)± 0.014(sys.)
|�m2ee| = 2.562⇥ 10�3 eV2
29Yoo-2020-06-25 @ Neutrino 2020 for RENO Collaboration
RENO Sterile Neutrino Search (Additional Plots)
RENO sterile neutrino searchRate only (2200 days)
(2020)
This results
RENO sterile neutrino searchSpectrum (2200 days)
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