Status of Mineral Oil R&D 1 st RENO Collaboration Meeting Daejung Kong, KNU

Introduction Liquid Scintillator R&D Environment R&D Status Summary Outline

Gd (Neutron catcher ) + Liquid Scintillator (  catcher) Baseline Oil –Mineral oil, Dodecane –LONG attenuation length Scintillant material –Pseudocumene(PC), PXE, toluene 1 st wavelength shifter –Wavelength ≤300 nm  ~350 nm –PPO, p-Terphenyl, PBD, Naphthalene 2 nd wavelength shifter –Wavelength ~350 nm  ~ 425 nm –POPOP, bis-MSB Other wavelength shifter –Wavelength ≤ 300 nm  ~ 425 nm –BPO Liquid Scintillator (LSc) Introduction

Introduction II 1 st Stage : Setup LSc R&D Environment –Preparation of reagent samples –Several LSc sample tests (cosmic ray, radioactive source) –Accumulation of other Exp. information 2 nd Stage : Long term stability Test –Aging Test –Absorption, Transparency, Light yield test, Etc., –Different Solvent Mixtures 3 rd Stage –LSc + Gd mixture –And Test …………..

03/31/06 : Mineral Oil arrived from SNU 05/12/06 : PC and stuffs arrived 05/15/06 : N 2 gas arrived 05/18/06 : First LSc samples produced 05/23/06 : First LSc samples tested 05/25/06 : Acryl Box construction 05/26/06 : First LSc R&D Group Meeting 06/01/06 : Survey of M.O in Korea 06/08/06 : Collection of M.O from Korean Co. 06/28/06 : Korean M.O Test LSc R&D History at KNU Preparation for LSc R&D Testing

Reagent samplesSpecificationQuantities Psedocumene (PC)C6H3(CH3)3 : density:0.8870L PPOScintillation grade, 99% density: g Mineral OilParaffin oil, Heavy density L POPOP(C 24 H 16 N 2 O 2 )1,4-bis-[2(5-phenyloxazolyl)-bezene100g LSc R&D Equipments Precise valance (up to 0.001g) Small bottles for LSc samples N 2 -gas Radioactive source ( 60 Co) PMT : PHILIPS VD202B : HV=1,200V, gain~10 6 Power supply : keithley 248 Pico-ammeter : keithley 485 Oscilloscope : Tectronix TDS620B cf) Purchased from Aldrich Sample Mixing Sample Test

LSc R&D Procedure LSc samples (MO+PC+PPO+POPOP) Radio-active source ( 60 Co) Pico-ammeter Cosmic RayOscilloscope

LSc R&D Environment N 2 injection PC : Toxic

LSc Mixing 3 일 후 1%PPO + Mineral Oil

SampleMO [g][%] Psudecumene PPO[%] POPOP[%]Remark M# (100) 000 C#1100(100)000 MP# (99.5)00.50w/o N 2 MP# (99.5)00.50w/ N 2 MP# (99)010w/o N 2 MP# (99)010w/ N 2 MP# (98)020w/o N 2 MP# (98)020w/ N 2 MC#180(80)2000w/o N 2 MCP# (80) w/o N 2 MCP# (80)2010w/ N 2 MCPO# (80) w/o N 2 MCPO# (80) w/o N 2 Current LSc R&D Samples

Storage for LSc Samples

LSc Test Setup 60 Co source

SampleMO [g][%] Psudecumene PPO[%] POPOP[%] 60 Co[nA] M# (100) C# MP# (99.5) MC#180(80) MCP# (80) MCP# (80) MCPO# (80) LSc Sample Tests with 60 Co

원유 (crude oil) 연료유 (fuel oil) B.C. asphalt YU-base Mineral Oil (white) 식품 (foods), 화장품 (cosmatics), Etc., ( refinement : extract heavy metal Mineral Oil M.O 알리파틱 + 나프텐 + 아로마틱

1.BMP 10 : YU-base (before Mineral Oil)8 2.BMP 32 : YU-base (before Mineral Oil)8 3.BMP 100 : Mineral Oil (‘S-Oil’ -> P96)5 4.BSO 17 : poly alpha olleffine : 합성유 9 5.BSO 400 : poly alpha olleffine : 합성유 9 6.KL 350(S) : White Oil ( 서진화학 )9 7.Silicone Oil (100 cSt/25 0 C) 9 8.Silicone Oil (1000 cSt/25 0 C) 8 9.Reference : Mineral Oil (Aldrich)9 Viscosity 60 Co Test [nA] Comparison of Mineral Oil b/w Aldrich and Korean Company 20mg

Summary : Setup LSc R&D Environment The results of LSc test are consistent Learned Know-How 1 st Stage 2 nd Stage : Equipment preparation Absorp, Transp, Light yield, Atten test Long Stability test

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Double-CHOOZ KamLAND