12/22/20151 4 Y.Gallant, 1 A.Garyaka, 2 A.D.Erlykin 5 L.Jones, 1 R.Martirosov, 2 N.Nikolskaya, 3...
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07/04/22 1 4 Y.Gallant, 1 A.Garyaka, 2 A.D.Erlykin 5 L.Jones, 1 R.Martirosov, 2 N.Nikolskaya, 3 J.Procureur, 1 S.Ter- Antonyan 1 Yerevan Physics Institute 2 Moscow Physics Institute 3 Centre d Etudes Nucleaires Bordeaux-Gradignan, 4 Universite Montpellier II 5 University of Michigan GAMMA Experiment GAMMA Experiment All-particle primary energy spectrum in the knee region or Does the GAMMA experiment detect the polar cap component at energies 70-80 PeV? http:// gamma.yerphi.am
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Transcript of 12/22/20151 4 Y.Gallant, 1 A.Garyaka, 2 A.D.Erlykin 5 L.Jones, 1 R.Martirosov, 2 N.Nikolskaya, 3...
04/21/23 1
4Y.Gallant, 1A.Garyaka, 2A.D.Erlykin5L.Jones, 1R.Martirosov,2N.Nikolskaya,
3J.Procureur, 1S.Ter-Antonyan
1 Yerevan Physics Institute2 Moscow Physics Institute
3 Centre d Etudes Nucleaires Bordeaux-Gradignan, 4 Universite Montpellier II
5 University of Michigan
GAMMA ExperimentGAMMA Experiment
All-particle primary energy spectrum in the knee region
or
Does the GAMMA experiment detect the polar cap component at energies 70-80 PeV?
http://gamma.yerphi.am
04/21/23 2
GAMMA FacilityGAMMA Facility
04/21/23 3
Energy estimator:Energy estimator: ),,,()()( cossNNfELnELn ch10 00 EEF )(if &
)2/))1(exp(()()(~ 21
10 EFEF
01 EEE /)( ,,),( )N( 110 ELnEEW
22222
111
F
F
F
F)]())([())((~
~
then
A2
2i1iA02 )EE(4
10
1i ,,, lnln
Statistic Errors Methodic Errors
),,,,...,( sNNaafE chn11 Let
)( ,,,,, sNNEA ch0
CORSIKA
i=1,…104, A=1,…4
,
Event-by-event analysis and All-Particle Energy SpectrumAll-Particle Energy Spectrum
04/21/23 4
CORSIKA6031(NKG)CORSIKA6031(NKG)EAS SimulationsEAS Simulations
Emax =5·103 PeV < 450
= -1.5Ee > 1 MeVE > 150 MeVE > 4 GeV (e)
SIBYLL2.1SIBYLL2.1
AA pp HeHe OO FeFe
EEminmin(PeV)(PeV) 0.50.5 0.70.7 1.01.0 1.21.2
N = 4 x 1.5104
GAMMA ExperimentGAMMA Experiment
04/21/23 5
EE00-E-E11 plot plot
syeayaxaacacsaxaLnE 76543211 )/(/
GAMMA ExperimentGAMMA Experiment
aa111.031.03
aa223.643.64
aa33-5.74-5.74
aa442.112.11
aa556.446.44
aa661.21.2
aa77-0.05-0.05
0.140.14
22 ~1~1
2min(E0,E1)
x = Ln(Nch), y = Ln(N), c = cos( )
04/21/23 6/ (EPeV)0.5(+0.10)(-0.17 )
= 0.13, = 0.03
A(E)(E)
Verification
04/21/23 7
The distributions of errors are Gaussian !The distributions of errors are Gaussian !
04/21/23 8
Zenith Angular Distribution
GAMMA ExperimentGAMMA Experiment
R<50m, <450
04/21/23 9
All-Particle Energy SpectrumAll-Particle Energy Spectrum
GAMMA05: R < 25m; Q < 300
GAMMA07: R < 50m; Q < 450
GAMMA ExperimentGAMMA Experiment
04/21/23 10
Sharpness of the kneeSharpness of the knee
1 = 2.7
2 = 3.2
= 2 = 4-5
2,1
kE
E
/
1
kE
E
kE
E
1 E, PeV
E2.
7 F
(E)
Polar Cap Component
Outer Gap ComponentMHD acceleration
04/21/23 11
Fine structure and additional pulsar components
A
dEEAfXEAWXF )(),()( , where )()()( EAPEAGEAf
Outer gap, p,1=1
Polar Cap, p,1=2MHD
F1(X) dF/dNch , and F2(X) dF/dN for < 300, R < 50m
04/21/23 12
Shower Spectra
GAMMA ExperimentGAMMA Experiment
04/21/23 13
All-particle spectra and pulsar All-particle spectra and pulsar FeFe component component
GAMMA ExperimentGAMMA Experiment
04/21/23 14
CONCLUSIONCONCLUSION
All-particle energy spectrum are obtained using GAMMA facility EAS database. The all-particle spectrum in the range of statistical and methodical errors agrees with the same spectrum obtained using EAS inverse approach in 5-70 PeV energy region. High accuracies of energy evaluations and small statistical errors point out to the existence of explicit irregularity (bump) of energy spectrum in the 70-80 PeV region.
GAMMA GAMMA ExperimentExperiment Multi-parametric event-by-event energy evaluation method
provided high accuracies (10-15%) for energy evaluation of primary nuclei regardless of nuclei mass number in 5-200 PeVenergy region;
The bump can be associated with an additional Fe-component from magnetosphere of pulsars.
04/21/23 15
GAMMA TEAMGAMMA TEAM
ThankThankss
GAMMA ExperimentGAMMA Experiment
