1. RICE: ICRC 2001, Aug 13, 2001 1 Recent Results from RICE Analysis of August 2000 Data See also: HE228: Ice Properties (contribution) HE241: Shower Simulation (poster) Dave Seckel for Dave Besson for the Rice Collaboration correspondence: dbesson@ku.edu

2. RICE: ICRC 2001, Aug 13, 2001 2 OUTLINE Concept Deployment Status Event Rate Calculation –Interaction rate –Detector efficiency and calibration Simulation of signal generation Propagation Data Acquisition Analysis Preliminary n e flux limit from Aug 2000 Summary

3. RICE: ICRC 2001, Aug 13, 2001 3 Radio Detection of High Energy Neutrinos Goals PeV: AGN 1 km 3 EeV: GZK 10 3 km 3 Coherent radiation S ~ D Q ~ 0.25 E s /GeV l ~ R M ~ 10 cm Transparency > 1 km Thermal noise @ 250 k

4. RICE: ICRC 2001, Aug 13, 2001 4 Deployment Status 16 Rx (10 cm dipole) 5 Tx 3 Horns 4 Oscilliscopes (x4) DAQ PCs Pulse Generator Dry hole Pole: Network analyzer Antenna range Kansas:

5. RICE: ICRC 2001, Aug 13, 2001 5 Single Channel Power Scope Trigger generator Antenna Amp in PV cable AmpFilter Splitter PC

6. RICE: ICRC 2001, Aug 13, 2001 6 Sample Trigger (surface event) Time domain Spectrum

7. RICE: ICRC 2001, Aug 13, 2001 7 Event Rates for RICE G is interaction rate to create a shower e is detection efficiency

8. RICE: ICRC 2001, Aug 13, 2001 8 G – interaction rate to create showers function of energy, direction and position f is local, after propagation through the Earth models for s may vary up to 50%

9. RICE: ICRC 2001, Aug 13, 2001 9 e - shower detection efficiency Monte Carlo Simulation + Calibration Several unique features to RICE Shower simulation + EM pulse calculation Pulse propagation Data acquisition and trigger Offline analysis

10. RICE: ICRC 2001, Aug 13, 2001 10 Shower simulations (see HE 241) ZHS GEANT FLUKA Number of particles & track length differ 30% Is this good or bad ?

11. RICE: ICRC 2001, Aug 13, 2001 11 EM pulse (see HE 241) 1.Angular distribution OK 2.Spectra differ slightly 3.All differences from shower Experimental results (Saltzberg, et al.) confirm coherence and Askaryan effect

12. RICE: ICRC 2001, Aug 13, 2001 12 Tx locations from timing residuals

13. RICE: ICRC 2001, Aug 13, 2001 13 Propagation (read HE 228) Index of refraction  Absorption Simultaneous fit to Rx, Tx positions and n(z)

14. RICE: ICRC 2001, Aug 13, 2001 14 DAQ: Antenna to trigger Power Scope Trigger generator Antenna Amp in PV cable AmpFilter Splitter PC

15. RICE: ICRC 2001, Aug 13, 2001 15 Antenna calibration Measure Z A, h, ( q, y) dependence Antenna Range

16. RICE: ICRC 2001, Aug 13, 2001 16 Amplifer Gains 14/3/2001 - 16/3/2001: 200 forced triggers w/thermal noise Isolate deep and surface Amps using filter Since 1/1/2001: stable +/- 1 dB

17. RICE: ICRC 2001, Aug 13, 2001 17 Individual channel calibration HP8713C NWA 0-1000 MHz 200-500 MHz: +/- 6 dB antenna + amplifier calibrations cable (TX, RX) and filter relative geometry of TX/RX (r, q)

18. RICE: ICRC 2001, Aug 13, 2001 18 Pulse Shapes Model response for d -function impulse Rx response for square wave pulse

19. RICE: ICRC 2001, Aug 13, 2001 19 Trigger logic

20. RICE: ICRC 2001, Aug 13, 2001 20 Effective Volume RICE 2000 4 hits (hardware) Ideal 1 hit, 1 s, l GHz 1 km 3 @ 100 PeV

21. RICE: ICRC 2001, Aug 13, 2001 21 Offline Analysis From waveforms Also: acceptable c 2 for vertex, and vertex below -50 m. Cuts pass ~85% of events in MC.

22. RICE: ICRC 2001, Aug 13, 2001 22 Model Flux Limits

23. RICE: ICRC 2001, Aug 13, 2001 23 Power Law Flux Limits

24. RICE: ICRC 2001, Aug 13, 2001 24 Summary Too many Dave’s Many calibration steps – many unique to RICE Could still be improved – but a number in every box 1 km 3 @ 100 PeV Flux limits about 100 above optimistic models (less than one month data) RICE-2 (bigger V, lower E - AGN) and RICE-3 (1000 km 3 @ 1 EeV - GZK)

25. RICE: ICRC 2001, Aug 13, 2001 25

26. RICE: ICRC 2001, Aug 13, 2001 26

27. RICE: ICRC 2001, Aug 13, 2001 27

28. RICE: ICRC 2001, Aug 13, 2001 28 Tests for Figures

29. RICE: ICRC 2001, Aug 13, 2001 29 RICE: Radio Ice Cerenkov Experiment Canterbury: –J. Adams, S. Seunarine Delaware: D. Seckel, G. M. Spiczak Florida State: G. Frichter Kansas: C. Allen, A. Bean, D. Besson, D. J. Box, R. Buniy, E. Copple, D. McKay, J. Ralston, S. Razzaque, D. W. Schmitz M.I.T.: I. Kravchenko correspondence: dbesson@ku.edu

30. RICE: ICRC 2001, Aug 13, 2001 30 Equations

31. RICE: ICRC 2001, Aug 13, 2001 31 Single channel spectral response antenna + amplifier calibrations cable (TX, RX) and filter relative geometry of TX/RX (r, q) HP8713C NWA 0-1000 MHz

32. RICE: ICRC 2001, Aug 13, 2001 32 Signal Strength

33. RICE: ICRC 2001, Aug 13, 2001 33 Spectrum

34. RICE: ICRC 2001, Aug 13, 2001 34

35. RICE: ICRC 2001, Aug 13, 2001 35