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Park Kang Soon Seokyeong Univ.

Status of the RENO. WIN09 @ San Clemente, Pelugia Sep. 14-19, 2009. Park Kang Soon Seokyeong Univ. New Reactor N eutrino q 13 E xperiment. CHOOZ : R osc = 1.01 ± 2.8% (stat) ± 2.7% (syst). Larger statistics - More powerful reactors (multi-core) - Larger detection volume

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Park Kang Soon Seokyeong Univ.

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  1. Status of the RENO WIN09 @ San Clemente, Pelugia Sep. 14-19, 2009 Park Kang Soon Seokyeong Univ.

  2. 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

  3. (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

  4. Comparison of Reactor Neutrino Experiments

  5. RENO Collaboration 11 institutions and 40 persons • 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. Summary of Construction Status • 03~10, 2007 : Geological survey and tunnel design are completed. • 05, 2008 ~ 02, 2009 : Completion of tunnel construction • Hamamatsu 10” PMTs have been ordered. • (expect to be delivered from Nov. 2009) • SK new electronics are ready. • 09, 2009 : Steel containers are ready to be assembled. • Acrylic containers and mechanical structure are under construction. ( will be done at the end of Nov. 2009 ) • Liquid scintillator handling system is being designed in detail. • Mock-up detector (~1/10 in volume) is made in Oct. 2008.

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

  8. Design of Tunnels Wing tunnel(L) Experimental hall Wing tunnel(C) Detector Experimental hall Wing tunnel(C) Detector

  9. (July, 2008) (July, 2008) (Aug, 2008) (92m) (Sep., 2008) (Aug, 2008) Construction for the Far Tunnel 그림 1) 원거리 입구 모습 Done !

  10. (Sep., 2008) (July, 2008) (90m) (Oct., 2008) Tunnel head (Dec., 2008) (40m) (Oct., 2008) Construction for the Near Tunnel Done !

  11. Construction for Experimental Hall Done !

  12. RENO Detector 421 PMTs in total total ~460 tons

  13. Buffer tank Proceeding of construction by NIVAK Co. Korea Veto Buffer Swing method of construction Almost done Cover leak test with water & oil

  14. Acrylic container Proceeding of construction by KOATECH Co. Korea Gamma catcher Target Banding acrylic plate A half of target It will be completely doneat the end of Nov.

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

  16. Mockup Detector Target + Gamma Catcher Acrylic Containers (PMMA: Polymethyl Methacrylate or Plexiglass) Buffer Stainless Steel Tank

  17. Mockup Detector Assembly Being under fine tuning the energy calibration with MC

  18. R&D on LAB(Linear Alkyl Benzene) properties : CnH2n+1-C6H5 (n=10~14) • 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. • Optical parameters are checked up. Gd Loaded Liquid Scintillator • Recipe of Liquid Scintillator :

  19. 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

  20. 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)

  21. Systematic Errors

  22. Calculation of Background Rates due to Radioactivity

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

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

  25. 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 → Tunnel construction has been finished in February, 2009. • RENO is under construction phase. • Data –taking is expected to start in mid 2010. • International collaborators are being invited.

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