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Resent Results in the Study of High Pressure Xenon for WIMP Detection

Resent Results in the Study of High Pressure Xenon for WIMP Detection. James T. White Texas A&M University. Collaborating with D. Nygren – LBL H. Wang - UCLA. 4th Symposium – on Large TPCs for Low Energy Rare Event Detection Institut Henri Poincare, Paris France Dec 18-19 2008.

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Resent Results in the Study of High Pressure Xenon for WIMP Detection

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  1. Resent Results in the Study ofHigh Pressure Xenon for WIMP Detection James T. White Texas A&M University Collaborating with D. Nygren – LBL H. Wang - UCLA 4th Symposium – on Large TPCs for Low Energy Rare Event Detection Institut Henri Poincare, Paris France Dec 18-19 2008

  2. Why Investigate HP Xenon for WIMP Detection? • Operational Considerations: • Room Temperature / No cryogenics ! • Simple purification • No leveling • New geometries / light detection ? • Physics: • Better Nr discrimination ? • Effect of better resolution ? HP Room T gas may be superior for long program to measure WIMP / Halo Properties

  3. Edge *** dN/dEr Er Neutron Scatteringw/ Mono-Energetic Neutrons En’ En, m θ Θ π Er, M Er  Ermax = (4 m M/(m+M)2) En

  4. Nuclear Recoil Discrimination4-PMT 100 atm Test Cell 4-PMT Test Cell Field tube PTFE reflector

  5. ? gammas neutrons Xe – 20 atm Nuclear Recoils

  6. Charge Yield Light Yield Charge and Light YieldNR in 20 Bar Xe (Weichung Ooi – UCLA) Preliminary Assuming W = 21.7 Assuming Ws = 76

  7. 7-PMT Test Cell S2 gap 2.5 mm 2.5 cm

  8. 7-PMT 20 Bar Test Cell cathode anode + fluorescence grid

  9. 7-PMT, 20 Bar Test Cell

  10. 1 inch R7378A 7-PMT,20 barTest Cell

  11. 60 keV Gamma 241Am Gammas 7-PMT Test Cell 30 keV 30 keV e- 60 keV 30 keV X-ray 30 keV e-

  12. Neutron Interaction7-PMT Test Cell

  13. S2/S1 NR Discrimination: 7PMT CellP = 15 bar S2/S1 projection Max recoil energy 22 keV

  14. Nr Discrimination

  15. NR @ 10 Barin 7-PMT cell S1 Edge = Er Max S2 Projection 30 keV reference Zoom & Log scale E_ee E_ee

  16. Charge Yield @ 10 Bar Preliminary

  17. Light Yield @ 10 Bar Assuming 76 eV/photon ! Preliminary

  18. Resolution vs E-Drift ? 400 V/cm G fit 200 V/cm @ 6 Bar – 30 keV

  19. Resolution vs E-Drift 6 Bar 13 Bar

  20. Summary • Observe good Nr discrimination from 1020 Bar • Charge and light yields similar to LXe – (maybe slightly lower) and appear similar from 10 20 Bar • NR discrimination appears better in Xe Gas compared to liquid Xenon • Energy Resolution is excellent At this point HP Noble Gas shows good promise for use as a discriminating WIMP detector – and – likely for 0-ν double beta decay.

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