Trapped positrons observed by PAMELA experiment

International Conference on Particle Physics and Astrophysics

Mikhailov, V.V.^1,14 ; Adriani, O.^2 ; Barbarino, G.^3 ; Bazilevskaya, G.A.^4 ; Bellotti, R.^5 ; Boezio, M.^6 ; Bogomolov, E.A.^7 ; Bongi, M.^2 ; Bonvicini, V.^6 ; Bottai, S.^2 ; Bruno, A.^5 ; Cafagna, F.S.^5 ; Campana, D.^3 ; Carbone, R.^3 ; Carlson, P.^8 ; Casolino, M.^9 ; Castellini, G.^10 ; Consiglio, L.^3 ; De Santis, C.^9 ; De Simone, N.^9 ; Felice, V. Di^9 ; Galper, A.M.^1 ; Karelin, A.V.^1 ; Koldashov, S.V.^1 ; Koldobsky, S.^1 ; Krutkov, S Yu^7 ; Kvashnin, A.N.^4 ; Leonov, A.A.^1 ; Malakhov, V.V.^1 ; Marcelli, L.^9 ; Martucci, M.^9,12 ; Mayorov, A.G.^1 ; Menn, W.^11 ; Merge, M.^9,13 ; Mocchiutti, E.^5 ; Monaco, A.^5 ; Mori, N.^10 ; Munini, R.^6 ; Osteria, G.^3 ; Papini, P.^2 ; Palma, F.^9,13 ; Panico, B.^3 ; Pearce, M.^8 ; Picozza, P.^9,13 ; Ricci, M.^12 ; Ricciarini, S.B.^2 ; Sarkar, R.^6 ; Scotti, V.^3 ; Simon, M.^11 ; Sparvoli, R.^9,13 ; Spillantini, P.^2 ; Stozhkov, Yu I^4 ; Vacchi, A.^6 ; Vannuccini, E.^2 ; Vasiliev, G.I.^7 ; Voronov, S.A.^1 ; Yurkin, Yu T^1 ; Zampa, G.^5 ; Zampa, N.^6

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^1

INFN, Sezione di Florence, Physics Department, University of Florence, Italy^2

INFN, Sezione di Naples, Physics Department, University of Naples Federico II, Italy^3

Lebedev Physical Institute, Russia^4

INFN, Sezione di Bari Physics and Department, University of Bari, Italy^5

INFN, Sezione di Trieste, Italy^6

Ioffe Physical Technical Institute, Russia^7

KTH, Department of Physics, Oskar Klein Centre for Cosmoparticle Physics, Sweden^8

INFN, Sezione di Rome Tor Vergata, Italy

(10) INFN, IFAC, Italy

(11) INFN, Physics Department, Universitaet Siegen, Germany

(12) INFN, Laboratori Nazionali di Frascati, Italy

(13) University of Rome Tor Vergata, Department of Physics, Italy

(14) Agenzia Spaziale Italiana (ASI), Science Data Center, Frascati

I-00044, Italy^9

关键词: Cosmic ray protons;    Cut-off rigidity;    Elliptical orbits;    Energy ranges;    Magnetic spectrometers;    Measurements of;    Near-earth spaces;    Production mechanisms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/675/3/032003/pdf
DOI  :  10.1088/1742-6596/675/3/032003

来源: IOP

【 摘 要 】

Measurements of electron and positron spatial distributions in energy range from 80 MeV to several GeV below the geomagnetic cutoff rigidity were carried out using the PAMELA magnetic spectrometer. The instrument is installed on board the Resurs-DK satellite which was launched June 15th 2006 on an elliptical orbit with the inclination 70 degrees and the altitude 350-600 km. The procedure of trajectories calculations in the geomagnetic filed gives a way to separate stably trapped and short lived albedo components produced in interactions of cosmic ray protons with the residual atmosphere. The work presents spatial distributions of trapped, quasitrapped and short-lived albedo electrons and positrons in the near Earth space. Electron to positron ratio points out on different production mechanism of trapped and quasitrapped particles.