Transcript Sub-EeV Cosmic Rays and Their Measurement

CRTNT Project
&
Cosmic RayτNeutrino (>1 PeV)
Measurement
Zhen Cao
IHEP, Beijing, China,
University of Utah
2015/7/7
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Collaborators:
Zhen Cao
 Alfred M. Huang
 Pierre Sokolsky
 Yuting Hu

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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
18%
τ-> hardron’s + ντ 65%

Existing Air Shower Technique:
Fluorescence/Cerenkov Light Detector:
HiRes/Dice …
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ντ to air shower conversion
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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)
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Mt. Wheeler Peak near Utah/Nevada Border
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3 Sites of
CRTNT
Detectors
&
Tau-neutrino
Induced Air
Shower
Initiating
Positions
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One of 3 sites: 4 telescopes to cover 60x14 deg2
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Tau Neutrino Induced Air Shower

AGN and other Neutrino source model
 Energy loss of tau inside Converter
 FL/CL detector trigger efficiency
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Predicted
Neutrino
Spectra:
(1996)
(1996)
AGN
&
GZK
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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
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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)
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