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Current Status of RENO

Current Status of RENO. Jaison Lee (Seoul National Univ.) for RENO Collaboration 2009/12/17, KISTI. Hint of q 13 >0 from different data sets and combinations : 1 s range. arXiv:0905.3549v2, Fogli et. al. New Reactor N eutrino q 13 E xperiment.

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Current Status of RENO

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  1. Current Status of RENO Jaison Lee (Seoul National Univ.) for RENO Collaboration 2009/12/17, KISTI

  2. Hint of q13 >0 from different data sets and combinations : 1s range arXiv:0905.3549v2, Fogli et. al. New Reactor Neutrino q13Experiment • CHOOZ : Rosc = 1.01 ± 2.8% (stat) ± 2.7% (syst) → Obtain ~1% precision !!! • Larger statistics - More powerful reactors (multi-core) - Larger detection volume - Longer exposure • Smaller experimental errors - Identical multi detectors • Lower background - Improved detector design - Increased overburden

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

  4. Comparison of Reactor Neutrino Experiments

  5. RENO Collaboration (11 institutions and 40 physicists) • Chonnam National University • Dongshin University • Gyeongsang National University • Kyungpook National University • Pusan National University • Sejong University • Seoul National University • Sungkyunkwan University • Seokyeong University • Institute of Nuclear Research RAS (Russia) • Institute of Physical Chemistry and Electrochemistry RAS (Russia) +++ http://neutrino.snu.ac.kr/RENO

  6. 200m high Near Detector Reactors 70m high 100m 300m 290m 1,380m Far Detector Schematic View of Underground Facility

  7. Google Satellite View of YongGwang Site

  8. Schematic Setup of RENO at YongGwang

  9. RENO Detector 421(354+61) 10” PMTs total ~460 tons

  10. Schedule

  11. Summary of Construction Status • 03~10, 2007 : Geological survey and tunnel design are completed. • 07~11, 2008 : Construction of both near and far tunnels are completed. • 12, 2008 ~ 03, 2009 : Veto tanks and peripheral facilities (electricity, air circulation, drainage, network, etc.) are completed. • Steel/acrylic containers and mechanical structures are under installation and will be completed until Nov. 2009. • 11, 2008 : SK new electronics wereadopted and ready. • PMT installation is expected to start from Dec. 2009. • Both near and far detectors are expected to be ready for data-taking in mid 2010. • 10, 2008 : A mockup detector (~1/10 in volume) was built and is tested out.

  12. 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

  13. 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

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

  15. Detector vertical halls are ready (2008.12~2009.2)

  16. Buffer steel tanks are installed (2009.6~2009.9) by NIVAK Co. Korea

  17. Acrylic vessels will be ready in Nov. 2009 (2009.7~2009.11) by KOATECH Co. Korea Gamma catcher Target Bending acrylic plates A half of target

  18. Electronics • Use SK new electronics (all hardwares are ready) Conceptual design of the system

  19. Mockup Detector Target + Gamma Catcher Acrylic Containers (PMMA: Polymethyl Methacrylate or Plexiglass) Buffer Stainless Steel Tank ~1/10 of RENO in volume

  20. Mockup Detector Assembly

  21. Energy Calibration of Mockup Detector 252Cf 60Co 137Cs 60Co 137Cs

  22. 0.1% Gd compounds with CBX (Carboxylic acids; R-COOH) - CBX : MVA (2-methylvaleric acid), TMHA (trimethylhexanoic acid) Gd Loaded Liquid Scintillator CnH2n+1-C6H5 (n=10~14) • Recipe of Liquid Scintillator • High Light Yield : not likely Mineral oil(MO) • replace MO and even Pseudocume(PC) • Good transparency (better than PC) • High Flash point : 147oC (PC : 48oC) • Environmentally friendly (PC : toxic) • Components well known (MO : not well known) • Domestically available:Isu Chemical Ltd. (이수화학)

  23. Optical Properties of Liquid Scintillator LS Attenuation Length ~ 8 m @ 420 nm LS Emission Spectrum

  24. Refractive Index of Detector Materials

  25. RACFrameWork Raw/MC Data Production Modules Reconstruction Modules User Analysis Modules User ntuples RENOAnalysisControl • default modules data input and output, database access for run configuration and calibration • Has talk-to functionfor changing input parameters without recompiling • Addition of modules by user • Modules can be set as filter modulefor selecting events • Easy to use and build in RENO software environment

  26. 4 MeV(KE) e+ y sy (mm) |y| Evis (MeV) 1 MeV (KE) e+ PMT coverage, resolution ~210 photoelectrons per MeV visible energy Reconstruction : vertex & energy • Reconstructed vertex:~8cm at the center of the detector • Energy response and resolution:

  27. time pulse height OD PMTs A ~140cm Veto (OD) B ~40cm Buffer (ID) target ID PMTs g-catcher buffer C ~120cm D Reconstruction of Cosmic Muons

  28. RENO Event Display

  29. Calculation of Muon Rate at the RENO Underground Muon intensity at the sea level using modified Gaisser parametrization + MUSIC or Geant4 (the code for propagating muon through rock)

  30. Calculation of Background Rates due to Radioactivity (Concentration : ppt) • AAS (Atomic Absorption Spectroscopy) : resolution : ±5% • Low radioimpurity glass • Suspicious (8.2(K), <50(Th), 8(U) : Kamland Acrylic) • Quoted from Kamland

  31. Systematic Uncertainty Goals

  32. 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) • Double Chooz • Near : 500/day • Far : 70/day • Near : 1,280/day, 468,000/year • Far : 114/day, 41,600/year

  33. RENO Expected Sensitivity 90% CL Limits Discovery Potential” (3s)

  34. New!! (full analysis) RENO Expected Sensitivity 10x better sensitivity than current limit

  35. SK Dm2 GLoBES group workshop@Heidelberg – Mention’s talk

  36. Status Report of RENO • RENO is suitable for measuring q13 (sin2(2q13) > 0.02) • Geological survey and design of access tunnels & detector cavities are completed → Civil constructionwas finished in February, 2009. • Buffer steel containers are installed. • RENO is under installation phase. • Data –taking is expected to start in mid 2010. • International collaborators are being invited.

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