Measurement of Dipole Anisotropy of Cosmic Rays

Karelin presents the dipole anisotropy measurement of protons and helium cosmic rays at an international conference on particle physics and astrophysics. The data analysis involved dividing the dataset into intervals, shifting intervals with a 5-degree step, and fitting a periodic function to calculate the amplitude. The experiment achieved good agreement with numerical simulations and explored variations in cosmic ray properties

• Cosmic Rays
• Anisotropy Measurement
• Particle Physics
• Astrophysics
• International Conference

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Presentation Transcript

1. A. Karelin on behalf of the PAMELA experiment The measurement of the dipole anisotropy of protons and helium cosmic rays with PAMELA experiment International conference on particle physics and astrophysics

2. - 16 X0 - 24x24 c 2 22 44 96 8x8 c 2

3. The examples of reconstructed shower axis inside the calorimeter

4. The anisotropy map for 180000 mip

5. D=0,1015; D=0,3889; P=0,05 , (x - ) 5

6. The whole set of data was divided on two intervals and than those intervals were shifted with the 5 degree step. After this procedure each bin contains about 1600000 events. The threshold is 180000 mip. Particles within the energy range 1-20 TeV. 0,0030 0,0025 0,0020 0,0015 0,0010 0,0005 Ir/Is-1 0,0000 -0,0005 -0,0010 -0,0015 -0,0020 -0,0025 -0,0030 0 50 100 150 RA, degree 200 250 300 350

7. To calculate the amplitude A the curve was fitted by a periodic function 0,004 y=y0+A*sin(pi*(x-xc)/w) K=2/pi A=0,0013 0,003 c=70 10 0,003 0,002 0,001 Ir/Is-1 0,000 -0,001 -0,002 -0,003 -0,004 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 RA, degree

9. The multiple numerical simulation gives the coefficient of determination While in the experiment we have 0,88 that is in the good agreement with the numerical test

10. The amplitude A of the sidereal daily variations From the review in the book G Homage to the discovery of Cosmic Rays Nova Science Publishers, New York, 2013 by Di. Sciascio and R. Iuppa

11. The phase of the sidereal daily variation From the review in the book G Homage to the discovery of Cosmic Rays Nova Science Publishers, New York, 2013 by Di. Sciascio and R. Iuppa