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Study of Liquid Scintillator Properties at RENO

Study of Liquid Scintillator Properties at RENO. 김수봉 , 김현수 , 박강순 , 박정식 , 신경하 , 이재승 , 최선호 , 황원석 ( 서울대학교 ) 공대정 , 김동희 , 김우영 , 사무엘 스테파냔 , 서준석 , 아딜 칸 , 안드레이 김 ( 경북대학교 ) 박인곤 ( 경상대학교 ) 박명렬 ( 동신대학교 ) 안정근 , 이효상 ( 부산대학교 ) 권은향 , 김동현 , 박차원 , 백승록 , 유인태 , 최수용 , 최영일 ( 성균관대학교 )

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Study of Liquid Scintillator Properties at RENO

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  1. Study of Liquid Scintillator Properties at RENO 김수봉, 김현수, 박강순, 박정식, 신경하, 이재승, 최선호, 황원석 (서울대학교) 공대정, 김동희, 김우영, 사무엘 스테파냔, 서준석, 아딜 칸, 안드레이 김 (경북대학교) 박인곤 (경상대학교) 박명렬 (동신대학교) 안정근, 이효상 (부산대학교) 권은향, 김동현, 박차원, 백승록, 유인태, 최수용, 최영일 (성균관대학교) 강운구, 김영덕, 마경주, 전은주 (세종대학교) 김성현, 김재률, 주경광, 임인택, 장지승, 정인석 (전남대학교) 오영도 (포항가속기연구소) N. Danilov, Yu, Krylov, G. Novikova, E. Yanovich (INR/IPCE) KPS at DCC Apr. 17~18, 2008

  2. γ prompt signal γ p n ~30μs γ + e γ Delayed signal Gd ν e q13 Dominant γ γ Survival Probability å ~ E MeV 8 g “far” q12 Dominant “near” Reactor Experiment for Neutrino Oscillation Inverse Beta Decay En<10 MeV Reactor Neutron captured at Gd

  3. RENO Detector Buffer region with PMT Front view RENO detector consists of four concentric cylindrical parts. Target & Gamma Catcher will filled Liquid Scintillator. Side view

  4. Liquid Scintillator at a Glimpse Required Properties Base solvent + primary scintillating fluor + secondary wavelength shifter • Transparency • High light yield • Long term stability • High radiopurity • Safety matter • Reasonable price • Massive quantity available After Before PC is widely used for base solvent for its excellent transparency and fluor dissolution. PMT sensitive region Effect of wavelength shifter General Elements of Liquid Scintillator

  5. RENO Base Liquid Scintillator • PC(20%) + dodecane(80%) + PPO(3g/L) + bis-MSB(30mg/L) • Gd-LS R&D with the Russian INR/IPCE group • : Gd-LS stability: good for > 6 months • Performance study of various LS recipes : • : light yield • : transmission & attenuation lengths • Development of purification system • : Al2O3 adsorption • : Vacuum distillation • : Water extraction, etc • Long-term stability test • Reactivity test with acrylic • Study of Linear alkyl benzene(LAB) Purification with Al2O3 Before After Purified ingredients is important!

  6. LAB GC-MS result of LAB Light Yield Measurement CnH2n+1-C6H5 (n=9~14)

  7. Optimization of PPO, bis-MSB Concentration Light Yield Measurement LY saturated when PPO 3g/L and bis-MSB 30mg/L

  8. Gadolonium • Gd has the highest thermal neutron capture cross-section, 49000barn. Target region fill with Gd loaded Liquid Scintillator. 0.1% loading is enough for RENO Gd need to transform to Gd-CBX for loading in organic phase CEDTA * VEDTA = CGd * VGd Where C = Concentration V = Volume Gd concentration check : EDTA Titration • Needed components • Xylenol-orange : Indicator • Buffer solution • EDTA

  9. Light yield Measurement with Cs source Cs source emits 0.668 MeV gamma Measurement was performed in special dark box with 2 inch PMT. NaI Crystal with 3cm*3cm*3cm 20mL LS with LAB + optimized PPO & bis-MSB Monte Carlo Simulation for 20mL LS

  10. LS Radiopurity Measurement • Natural Radioactive material give rise to background. • Internal background material : 238U, 232Th, 40K • Dominate from PMT glass : 10Hz • LS radioimpurity contribute to background : 10-12g/g ~7Hz • Accurate radioimpurity quantity measurement with ICP-MS. MC simulation of internal background ICP-MS result of LAB Unit : ppb=ug/L

  11. Summary • LAB has comparable properties with PC. • Optimized PPO and bis-MSB concentration for LAB. • Gd concentration can be checked with EDTA titration. • Light Yield was measured in special dark box with compton edge FWHM. • LS radioimpurity quantity was measured accurately with ICP-MS. • Long term stability test is on going.

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