gzk ehe detection what is the gzk mechanism? ehe propagation in the earth expected intensities at...
Post on 21-Dec-2015
229 views
TRANSCRIPT
GZK EHE detection
What is the GZK mechanism?
EHE Propagation in the Earth
Expected intensities at the IceCube depth
Atmospheric – background
Event rate
TAUP 2003
GZK Neutrino ProductionGZK Neutrino Production
2.725 K
411 photons / cm3
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
Gamma Beam Energy (GeV)
Cro
ss S
ect
ion (mb)
0.1
0.01
γ + p→Δ (1232)→ π o p or π + n
0.6 x 10-27 cm2
γp
n p
π+ μ+ ν
e+
νγ
E = 10 20 eV
E 0.8 x 10 20 eV ~
Conventional Mechanism of EHE neutrinos!!Conventional Mechanism of EHE neutrinos!!
TAUP 2003
Yoshida and Teshima 1993Yoshida, Dai, Jui, Sommers 1997
Note: The oscillations convert e, to e,,
e
e
e/
e/
Weak
Weak
Weak
Inco
min
gProducts
Weak
Weak
Weak
Cascades
Cascades
Decay DecayWeak
Pair/decayBremss Pair Pair PhotoNucl.
PhotoNucl.DecayPair Pair
PairBremssDecay
DecayWeak
Decay
TAUP 2003
Down-going events dominates…
1400 m
2800 m
11000mUp Down
Atmospheric is strongly attenuated…
TAUP 2003
Intensity of EHE and GZK m=4 Zmax=4
I(E>10PeV) I(E>10PeV) RATE [/yr/km2]
Down 5.90 10-19 5.97 10-19 0.37
Up 3.91 10-20 6.63 10-20 0.03
I(E>10PeV) Energy Deposit
I(E>10PeV) Energy Deposit
Down 4.75 10-19 2.94 10-19 0.24
m=7 Zmax=5Down
7.21 10-17 4.83 10-17 37.9
Atm 1.74 10-19 0.05
[cm-2 sec-1]
Eµ=10 TeV ≈ 90 hits Eµ=6 PeV ≈ 1000 hits
How EHE events look like
The typical light cylinder generated by a muon of 100 GeV is 20 m, 1PeV 400 m, 1EeV it is about 600 to 700 m.
TAUP 2003Conclusion
appeared in 10 PeV- EeV are our prime target on GZK detection.
1/100-1/500 of primary intensity!Downward and make main contributions in PeV -EeV
Energy Estimation would be a key for the bg reductionBecause atmospheric spectrum ~ E-3.7
GZK is DETECTABLE by IceCube 0.2-40 events/year (BG 0.05 events/year)
IceCube has great capability for TeV-PeV-induced muons taking advantage of long rangein the clear ice.
For EHE like the GZK….