The KASCADE-Grande experiment Data selection and systematics Y parameter Energy spectrum

JC.Arteaga, IFM, Universidad Michoacana (arteaga@ifm.umich.mx) 1 ECRS, Moscow, July, 2012

Separation of the light and heavy mass groups of cosmic rays in KASCADE-Grande

using the Y-ratio

J.C. Arteaga-Velázquez for the KASCADE-Grande

Collaboration

IFM, Universidad MichoacanaMorelia, Michoacan, Mexico

1) The KASCADE-Grande experiment2) Data selection and systematics3) Y parameter 4) Energy spectrum5) Conclusions

using the Y-ratio

E = 1016 - 1018 eV

using the Y-ratio

What is the origin of the knee?

What is the source of the E = 1015 – 1018 eV cosmic rays?

Galactic-extragalactic transition?

Second knee (~1017

Composition?

Z or A dependence?

Acceleration/propagation?

using the Y-ratio

Details:-Nμ

-192 stations- 622 m2 total-Eμ 230 MeV

Details: - Nch

- e//- 37 10 m2 stations- E 3 MeV

Grande Station

detector

using the Y-ratio

N Precision: < 25%

Nch Precision: < 15 %

CORSIKA/QGSJET II

using the Y-ratio

After correction: < 10%

correction function is used: CF(N, ,, xcore, ycore)

Nch Precision: < 15 %

CORSIKA/QGSJET II

using the Y-ratio

A = 1.37 105 m2 A = 1.52 105 m2

PRL Y-ratio analysis (2011)PRL 107, 171194 (2011)

This Y-ratio analysis

= [0 , 30] = [0 , 40]

Teff = 1173 days Teff = 1434 days

lg(E/GeV) > 7.4lg(E/GeV) > 7.4

CORSIKA/QGSJET II simulations: • E = 1015 – 31018 eV.• H, He, C, Si, Fe.• = -3.

Exp = 2.5 1013 m2 s srExp = 2 1013 m2 s sr

using the Y-ratio

Corrected for attenuation in the atmosphere (CIC method).

Divide data into two mass groups according to:

YCIC 0.84

YCIC < 0.84

YCICCUT = 0.84

By applying a cut:

using the Y-ratio

The YCICCUT is independent of energy, core position and zenith angle

using the Y-ratio

Calibration formula exploit correlation of Nch-Nμ with primary mass

PRL 107, 171194 (2011)Astropart.Phys. 36, 183 (2012)

QGSJET IIQGSJET II

using the Y-ratio

CORSIKA/QGSJET II

Energy spectraNot corrected for shower fluctuations

using the Y-ratio

lg(Ek/GeV) = 7.94 0.08

= -0.14

CORSIKA/QGSJET II

1= -3.01 0.01

2= -3.15 0.03

Soft break in all-particle energy spectrumSoft break in all-particle energy spectrum

using the Y-ratio

CORSIKA/QGSJET II

lg(Ek/GeV) = 7.84 0.08

= -0.47

1= -2.72 0.01

2= -3.19 0.04

Break in energy spectrum of heavy componentBreak in energy spectrum of heavy component

using the Y-ratio

CORSIKA/QGSJET II = -3.4 0.01

• Deviation at HE from a power law? More statistics needed to justify or exclude the spectral recurrence of light nuclei

JC.Arteaga, IFM, Universidad Michoacana (arteaga@ifm.umich.mx) 1 5 ECRS, Moscow, July, 2012

•Statistically (still) in agreement with a single power-law

using the Y-ratio

Spectra obtained using different YCIC cuts

Equivalent to different hadronic interaction models

using the Y-ratio

KASCADE vs KASCADE-Grande

Astropart. Phys. 24,(2005)

Conclusions

1) The all-particle energy spectrum of cosmic rays presents a soft break at E107.94 GeV (QGSJET II).

2) The spectrum of the heavy mass component of cosmic rays shows a knee at E107.84 eV (QGSJET II).

3) All spectra for the heavy component obtained using different YCIC cuts show a knee feature.

4) Need more statistics to investigate light component at HE (underway, by increasing effective area and zenith angle interval).

5) In the framework of the QGSJET II model, the contribution of the misclassified Si/Fe events to the light component is small.

using the Y-ratio

Thank you

using the Y-ratio

Backup slides

using the Y-ratio

All particle

using the Y-ratio

The KASCADE-Grande experiment Data selection and systematics Y parameter Energy spectrum

Documents

CIC method applied to the KASCADE-Grande muon data

Cladistic systematics

Interpretation of KASCADE-Grande Data using MC Energy spectrum with QGSJET, SIBYLL, EPOS

Plant Systematics What is Systematics? Botany 400 or Why Study

Systematics Capabilities

Biodiversity and systematics of nematode–bacterium entomopathogens and systematics of... · Biodiversity and systematics of nematode–bacterium entomopathogens ... Our knowledge

Test of the SIBYLL 2.3 high-energy hadronic interaction ...€¦ · Juan Carlos Arteaga-Velázquez*, D. Rivera for the KASCADE-Grande Collaboration Instituto de Física y Matemáticas,

The energy spectrum from the KASCADE-Grande muon data

Systematics , T axonomy, Phylogeny and Evolution Systematics

Pierre Auger Observatory and KASCADE-Grande · High energy cosmic rays more than 57EeV (57*10^18eV) Arrival direction of the 27 highestenergetic cosmic ray particles detected by the

Topic 2: Systematics I...1 Topic 2: Systematics I What is the difference between taxonomy, classification, systematics? Why is systematics important? Terminology of systematics What

Seaweed Systematics

ISCRA 06 – Erice 23/06/06 Fabiana Cossavella for the KASCADE-Grande collaboration Status and first results of the KASCADE-Grande experiment

Cosmic Rays from 10 16 to 10 18 eV. Open Problem and Experimental Results. (KASCADE-Grande view)

Phylogeny & Systematics

Advances in Legume Systematics, part 10, Higher Level Systematics

Cladistics - Systematics

Cosmic Rays from 10 16 to 10 18 eV. Open Problem and Experimental Results. (KASCADE-Grande view) Very High Energy Phenomena in the Universe XLIV th Rencontres

GEANT 4 simulation of energy deposited in KASCADE-Grande detectors

Plant Systematics - University of Wisconsin–Madisoncourses.botany.wisc.edu/botany_400/Lecture/0pdf/01Introduction.pdf · 2 What is Systematics — or Why Study Systematics? Taxonomy