1. CRTNT Project & Cosmic RayτNeutrino (>1 PeV) Measurement
Zhen Cao
IHEP, Beijing, China,
University of Utah
2018/11/23
Zhen Cao

2. Collaborators: Zhen Cao Alfred M. Huang Pierre Sokolsky Yuting Hu
2018/11/23
Zhen Cao

3. Introduction νe: νμ: ντ = 1:1:1 IceCube, ANTRAES, NESTOR, BAIKAL…
Ultra High Energy Neutrino:
Air shower vs. single muon
ντ to air shower:
ντ -> τ + X; τ-> e + νe + ντ %
τ-> hardron’s + ντ 65%
Existing Air Shower Technique: Fluorescence/Cerenkov Light Detector: HiRes/Dice …
2018/11/23
Zhen Cao

4. ντ to air shower conversion
2018/11/23
Zhen Cao

5. CRTNT Project ------- Cosmic Ray Tau Neutrino Telescope
12(16) HiRes-type FL/CL Telescopes
5.0m2 Spherical mirror for UV light collection
256 PMT’s cluster for shower imaging
3 sites in front of a mountain
Mt. Wheeler Peak between Utah & Nevada
FOV: 3x(60 deg x 14 deg)
2018/11/23
Zhen Cao

6. 2018/11/23
Zhen Cao

7. 2018/11/23
Zhen Cao

8. 2018/11/23
Zhen Cao

9. Mt. Wheeler Peak near Utah/Nevada Border
2018/11/23
Zhen Cao

10. Tau-neutrino Induced Air Shower Initiating
3 Sites of CRTNT
Detectors
&
Tau-neutrino Induced Air Shower Initiating
Positions
2018/11/23
Zhen Cao

11. One of 3 sites: 4 telescopes to cover 60x14 deg2
2018/11/23
Zhen Cao

12. Tau Neutrino Induced Air Shower
AGN and other Neutrino source model
Energy loss of tau inside Converter
FL/CL detector trigger efficiency
2018/11/23
Zhen Cao

13. Predicted Neutrino Spectra: AGN & GZK (1996) (1996) 2018/11/23
Zhen Cao

15. The total detection efficiency of tau neutrinos from AGN is 1.4x10-5
The expected event number per year is
4.8 events
A duty cycle of 15% is assumed considering a possibility of running with moon partially
2018/11/23
Zhen Cao

16. Conclusion
Proposed CRTNT Project Has a Sensitivity for AGN Tau Neutrino Detection Using HiRe/Dice-type FL/CL Telescopes
3 Site Detector Has Been Optimized Using Simulation Tool
Could See 4.8 Events per Year above 1 PeV (15% Duty Cycle)
2018/11/23
Zhen Cao