Eun-Ju Jeon Sejong Univ. Sept. 09, 2010

1. Status of RENO Experiment Neutrino Oscillation Workshop (NOW2010) September 4-11, 2010, Otranto, Lecce, Italy Eun-Ju Jeon Sejong Univ. Sept. 09, 2010

2. Outline • Overview of the RENO Experiment - YongGwang Power Plant - Experimental Setup - Statistical & Systematic Uncertainties - Expected 13Sensitivity - Schedule • Construction Status of the RENO Experiment - Tunnel - Detector - DAQ & Data Analysis Tools

3. RENO Collaboration (13 institutions and 40 physicists) • Chonnam National University • Chonbuk National University • Dongshin University • Gyeongsang National University • Kyungpook National University • Pusan National University • Sejong University • Seokang Information University • Seokyeong University • Seoul National University • Sungkyunkwan University • Institute of Nuclear Research RAS (Russia) • Institute of Physical Chemistry and Electrochemistry RAS (Russia) +++ http://neutrino.snu.ac.kr/RENO

4. YongGwang Nuclear Power Plant YongGwang(靈光): = glorious[splendid] light • Located in the west coast of southern part of Korea • ~250 km from Seoul • 6 reactors are lined up in roughly equal • distances and span ~1.3 km • Total average thermal output ~16.4GWth • (2nd largest in the world)

5. RENO Experimental Setup

6. Google Satellite View of Experimental Site

7. 200m high Near Detector Reactors 70m high 100m 300m 290m 1,380m Far Detector Schematic View of Underground Facility

8. RENO Detector • 354 10” Inner PMTs : 14% surface coverage • 67 10” Outer PMTs

9. 3 years of data taking with 70% efficiency Near : 9.83x105 ≈ 106 (0.1% error) Far : 8.74x104 ≈ 105 (0.3% error) Expected Number of Neutrino Events at RENO • 2.73 GW per reactor ⅹ 6 reactors • 1.21x1030 free protons per targets (16 tons) • Near : 1,280/day, 468,000/year • Far : 114/day, 41,600/year

10. Expected Systematic Uncertainty

11. 90% CL Limits Discovery Potential” (3s) • 10 times better sensitivity than the current limit RENO Expected Sensivity

12. 12 12 12 12 3 3 3 6 6 6 6 9 9 9 9 Schedule 2006 2007 2008 2009 2010 Activities Activities 3 12 3 6 9 Detector Design & Specification Geological Survey & Tunnel Design Detector Construction Excavation & Underground Facility Construction Detector Commissioning • Tunnel facility, detector structure & buffer steel tanks completed • June 2010 : Acrylic containers installed • Aug. 2010 : PMT test completed • Sep. 2010 : Installation of PMTs, veto tyvek and liquid handling system • Oct. 2010 : Installation of DAQ & HV and filling with liquid scintillator • Nov. 2010 : Closing and detector commissioning • Dec. 2010 : Start data taking

13. Comparison of Reactor Neutrino Experiments

14. Summary of Construction Status • 03~11, 2007 : Geological survey and tunnel design are completed. • 06~12, 2008 : Construction of both near and far tunnels are completed. • 12, 2008 ~ 06, 2009 : Veto tanks and peripheral facilities (electricity, air circulation, drainage, network, etc.) are completed. • 11, 2008 : SK new electronics wereadopted and ready. • 06~11, 2009 : Buffer steel tanks are installed • 06, 2010: Acrylic containers are installed. • 08, 2010: PMT test is completed • PMT installation is underway. • Both near and far detectors are expected to be ready for data-taking in late 2010.

15. Tunnel Construction (2008.6~2008.12) by Daewoo Eng. Co. Korea

16. Near & far tunnels are completed (2008.6~2009.3) by Daewoo Eng. Co. Korea Far site Near site

17. Vertical detector halls & steel structure are ready (2008. 12~2009. 06) by NIVAK Co. Korea

18. Experimental Hall

19. Buffer steel tanks are installed (2009.6~2009.11) by NIVAK Co. Korea

20. Installation of Acrylic Vessels (2010. 6)

21. PMT Holder (2009. 10~12) and Mounting (2010. 9)

24. Thank you! Summary • RENO is suitable for measuring q13 (sin2(2q13) > 0.02) • RENO is near completion. • Data –taking is expected to start in late 2010.

25. Backup

26. New Reactor Neutrino q13Experiment • CHOOZ : Rosc = 1.01 ± 2.8% (stat) ± 2.7% (syst) • Larger statistics - More powerful reactors (multi-core) - Larger detection volume - Longer exposure → Obtain ~1% precision !!! • Smaller experimental errors - Identical multi detectors • Lower background - Improved detector design - Increased overburden

27. νe νe νe νe νe νe sin22θ13 • Find disappearance of ne fluxes due to neutrino oscillation as a function of energy using multiple, identical detectors to reduce the systematic errors in 1% level. Experimental Method of q13 Measurement Oscillations observed as a deficit of anti-neutrinos 1.0 Obseved flux before oscillation Probabilité νe Distance 1200 to 1800 meters

28. (3) 1μs<ΔT <200μs n captureenergy e+ energy (1) 0.7<Eprompot <9MeV (2) 5<Edelayed <11MeV data from CHOOZ hep-ex/0301017v1 Detection of Reactor Neutrinos

29. Far detector site: • tunnel length : 272m • overburden • height : 168.1m Rock Quality Map (2007.3~2007.8) • Near detector site: • tunnel length : 110m • overburden • height : 46.1m

30. Design of Tunnel Design of Tunnels (2007.9~2007.11) Wing tunnel(L) Access tunnel Experimental hall Wing tunnel(R) Detector Experimental hall Access tunnel Wing tunnel(R) Detectorvertical hall