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Metal loaded liquid scintillator for the double beta decay

Metal loaded liquid scintillator for the double beta decay. Presented by I.C.Hwang Yonsei University. Double beta decay. Double beta decay process. (A,Z+1). (A,Z-1). (A,Z). (A,Z). (A,Z) -> (A,Z+2) + 2 b +2 n (A,Z) -> (A,Z-2) + 2 b + +2 n EC+ b + ,2EC also is possible.

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Metal loaded liquid scintillator for the double beta decay

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  1. Metal loaded liquid scintillator for the double beta decay Presented by I.C.Hwang Yonsei University

  2. Double beta decay

  3. Double beta decay process (A,Z+1) (A,Z-1) (A,Z) (A,Z) (A,Z) -> (A,Z+2) + 2b +2n (A,Z) -> (A,Z-2) + 2b+ +2n EC+b+ ,2EC also is possible (A,Z+2) (A,Z-2) Excited state g b+-> g g (511 keV) Ground state

  4. Why high-Z loaded scintillator? • Advantage a) Some high-Z can't be used for inorganic scintillator. b) high-Z can be loaded to LS (>50% or more) c) Fast timing response (few ns) d) Low cost of LS, Large volume is possible e) U/Th/K background for LS is low and purification is known f) alpha/gamma separation may be possible • Disadvantage a) Bigger volume is necessary (C,H in LS, low density) b) Moderate light output (~15% of NaI(Tl))

  5. HV + LSC LSC test sample Setup VME

  6. Setup VME Gate & Delay generator 1 1 8 2 A D C Gate:200ns Delay:250ns Computer Dark Box Co60 LSC H1161 Th:50mv Discriminator

  7. Metal-loaded LSC for DB STD : Solvent+Solute+ Wavelength shifter * Solvent; PseudoCumene, Solute: PPO (4g/1liter), WLS: POPOP (30mg/liter) • Tin compound 1) Tetramethyl-tin (40%w50%) : flammable,expensive 2) Tetrabutyl-tin (19%w50%) • Zr compound Zr4-ethylhexanoate (Zr4-EH+mineral-oil , Zr: 6%) • Nd compound Nd2-ethylhexanoate (Nd: 12.5%)

  8. Zr2EH + LSC with Co60

  9. Nd2EH + LSC with Co60

  10. TetraButhyl Tin + LSC with Co60

  11. TetraMethyl Tin + LSC with Co60

  12. Plan • Long term Stabillity Zr2EH(50%),Nd2EH(50%),TM(50%),TB(50%) • Characteristics in bigger volume • 1L * 4 : two of them are St cover, the others are acrylic. • electronics 500MHz FADC to identify and reject • U238, Th 232 decay chains • Pilot experiment :Underground with Pb shielding for the long term test • If successful, we can set the 0-nu double beta decay limit for the Sn, Zr, Nd

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