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Search for inelastic scattering of WIMP with CsI ( Tl )

Search for inelastic scattering of WIMP with CsI ( Tl ). KIMS collaboration 2007. 11. 23 S. Ryu,. Introduction - Indirect Search. Rotation curve of Spiral Galaxies Cosmic microwave background COBE, BOOMERANG, WMAP Modern X-ray Search Gravitational Lensing. Collaboration Meeting. 60 o.

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Search for inelastic scattering of WIMP with CsI ( Tl )

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  1. Search for inelastic scattering of WIMP with CsI(Tl) KIMS collaboration 2007. 11. 23 S. Ryu,

  2. Introduction - Indirect Search • Rotation curve of Spiral Galaxies • Cosmic microwave background • COBE, BOOMERANG, WMAP • Modern X-ray Search • Gravitational Lensing 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  3. 60o 220 km/s 30 km/s Introduction - Direct detection scheme ρχ= 0.3 GeV cm-3 from the rotation curve of Milky Way Galaxy 8 x 8 x 30 cm3, ~8 kg 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  4. Elastic & Inelastic scattering • Double signature = recoil + γ • Threshold Energy (57.6 keV for 127I) • Lower cross section, but no quenching effect Elastic scattering of DM Elastic scattering of spin-coupled DM Inelastic scattering of spin-coupled DM 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  5. 5 The properties of CsI(Tl) crystal • Low internal background • Good Pulse Shape Discrimination (PSD) • Quenching 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  6. Background event of SET3 Beijing0501A Beijing0501B Shanghai0406 Coincidence event rejection  ~ 6cpd level (20keV - 100keV) 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  7. Calibration & Resolution 241Am source used (59.54 keV, 26.34 keV) ΔE = 5.07 at 59.54 keV ΔE/E = 0.36/√E + 0.026 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  8. Background Fitting KIMS, CsI(Tl) : 8 x 8 x 23 cm, 6.02 kg 1 crystal used ELEGANT V, NaI(Tl) : 10 x 10 x 102.3 cm, 47kg 17 crystals used β from 210Pb, 46.5 keV γ of 210Bi 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  9. Background Subtraction KIMS 0.79±0.74 cpd / kg , 1.76 cpd / kg ( 90% C.L.) ELEGANT V 0.098 cpd/ kg(90% C.L.) 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  10. Event rate calculation Total Event Rate Mass threshold : 11.9 GeV for 129Xe 18.2 GeV for 127I 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  11. Quenching (f) : 0.2 ~ 0.05 (20 – 140 keV) Monte-Carlo Simulation • Event for different WIMP mass • 50GeV • 100GeV • 500GeV 1. Edet = ER x f + E*, 2. Energy Resolution 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  12. KIMS project: 9269 kg days KIMS Project : 37600 kg days Exclusion curve & project limit KIMS experiment (2007): 1.76 cpd (90% C.L) ELEGANT V experiment (1994): 9.8 x 10-2 cpd DAMA 129Xe experiment (2000): 1.16 x 10-2 cpd KIMS : 319.1 kg days Project Limit Elegant V : 61390 kg days More data are ready to be analyzed : SET4 (2122.9 kg day) + SET6 (1728.6 kg day) + SET8 (3096 kg day) + SET9 (2322 kg day) = Total 9269.5 kg day New installation ( 12 crystals) 103.2 kg x 1 year ~ 37600 kg day DAMA Xe : 2530.2 kg days 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

  13. Summary • CsI(Tl) Single Crystal (Shanghai0406, 6.02 kg) • 319.1 kg day, 6 cpd level (20~100 keV) • 0.79±0.74 cpd / kg, 1.76 cpd (90% C.L.) • The limit can be improved by the analysis of the remaining data. 2th Korea-China joint workshop 2007Collaboration Meeting Collaboration Meeting

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