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Proposal for RENO-50

Proposal for RENO-50. Soo -Bong Kim (KNRC, Seoul National University) “International Workshop on RENO-50, June 13-14, 2013”. Overview of RENO-50.

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Proposal for RENO-50

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  1. Proposal for RENO-50 Soo-Bong Kim (KNRC, Seoul National University) “International Workshop on RENO-50, June 13-14, 2013”

  2. Overview of RENO-50 • RENO-50 : An underground detector consisting of 18 kton ultra- low-radioactivity liquid scintillator & 15,000 20” PMTs, at 50 km away from the Hanbit(Yonggwang) nuclear power plant • Goals: - High-precision measurement of q12 and Dm221- Determination of neutrino mass hierarchy - Study neutrinos from reactors, (the Sun), the Earth, Supernova, and any possible stellar objects • Budget : $ 100M for 6 year construction (Civil engineering: $ 15M, Detector: $ 85M) • Schedule : 2013 ~ 2018 : Facility and detector construction 2019 ~ : Operation and experiment

  3. Near Detector Far Detector RENO-50 10 kton LS Detector ~47 km from YG reactors Mt. Guemseong (450 m) ~900 m.w.e. overburden

  4. Funding • 1st attempt in 2012 : almost successful but failed • Continuous attempts with organized efforts : • - Korea has significantly increased investments into the basic science. • - Korea established a new institute of IBS in 2012. • - Complete a conceptual design based on more detailed MC studies and • optimized detector design. • - Prepare a well-written proposal. • - Form international collaboration (LOI)

  5. Technical Challenges • Large detector (18 ktons) : D=30m, H=30m • 3% energy resolution : • - High transparency LS : 15 m → 25 m (purification & better PPO) • - Large photocathode coverage : 34% → 67% (15,000 20” PMT) • - High QE PMT : 20% → 35% (Hamamatsu 20” HQE PMT) • - High light yield LS : ×1.5 (1.5 g/ℓ PPO → 5 g/ℓ PPO)

  6. Expected Energy Resolution PMT coverage : 67% (15,000 20” PMTs) PMT coverage : 67% (15,000 20” PMTs) + Attenuation length : 25 m + QE : 35%

  7. Conceptual Design of RENO-50 1000 10” OD PMTs 1000 20” OD PMTs Water Water Mineral Oil Mineral Oil LS (10 kton) 15000 10” PMTs (24%) LS (18 kton) 15000 20” PMTs (67%) 37 m 32 m 27 m 25 m 30 m 32 m 30 m 25 m 27 m 32 m 37 m 32 m

  8. Physics Goals • Precise measurement of q12, Dm221 and Dm231 (← 5.4%) (← 2.6%) (← 5.2%) • Determinationof mass hierarchy (sign of Dm231 or Dm232) • - Quite challenging : requires extremely good energy resolution • Neutrino burst from a Supernova in our Galaxy • - ~5400 events (@8 kpc) • - A long-term neutrino telescope • Geo-neutrinos : ~ 900 geo-neutrinos for 5 years • - Study the heat generation mechanism inside the Earth

  9. Schedule • 2013 : Group organization • Detector simulation & design • Geological survey • 2014 ~ 2015 :Civil engineering for tunnel excavation • Underground facility ready • Structure design • PMT evaluation and order, • Preparation for electronics, HV, DAQ & software tools, • R&D for liquid scintillator and purification • 2016 ~ 2018 :Detector construction • 2019 ~ :Data taking & analysis

  10. Your ideas and participation invited!

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