First result from the Alpha Magnetic Spectrometer on the International Space Station: precision measurement of the positron fraction in primary cosmic rays of 0.5-350 GeV

First result from the Alpha Magnetic Spectrometer on the International Space Station: precision measurement of the positron fraction in primary cosmic rays of 0.5-350 GeV

A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction...

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Veröffentlicht in:Physical review letters 2013-04, Vol.110 (14), p.141102-141102, Article 141102
Hauptverfasser: Aguilar, M, Alberti, G, Alpat, B, Alvino, A, Ambrosi, G, Andeen, K, Anderhub, H, Arruda, L, Azzarello, P, Bachlechner, A, Barao, F, Baret, B, Barrau, A, Barrin, L, Bartoloni, A, Basara, L, Basili, A, Batalha, L, Bates, J, Battiston, R, Bazo, J, Becker, R, Becker, U, Behlmann, M, Beischer, B, Berdugo, J, Berges, P, Bertucci, B, Bigongiari, G, Biland, A, Bindi, V, Bizzaglia, S, Boella, G, de Boer, W, Bollweg, K, Bolmont, J, Borgia, B, Borsini, S, Boschini, M J, Boudoul, G, Bourquin, M, Brun, P, Buénerd, M, Burger, J, Burger, W, Cadoux, F, Cai, X D, Capell, M, Casadei, D, Casaus, J, Cascioli, V, Castellini, G, Cernuda, I, Cervelli, F, Chae, M J, Chang, Y H, Chen, A I, Chen, C R, Chen, H, Cheng, G M, Chen, H S, Cheng, L, Chernoplyiokov, N, Chikanian, A, Choumilov, E, Choutko, V, Chung, C H, Clark, C, Clavero, R, Coignet, G, Commichau, V, Consolandi, C, Contin, A, Corti, C, Costado Dios, M T, Coste, B, Crespo, D, Cui, Z, Dai, M, Delgado, C, Della Torre, S, Demirkoz, B, Dennett, P, Derome, L, Di Falco, S, Diao, X H, Diago, A, Djambazov, L, Díaz, C, von Doetinchem, P, Du, W J, Dubois, J M, Duperay, R, Duranti, M, D'Urso, D, Egorov, A, Eline, A, Eppling, F J, Eronen, T, van Es, J
Format: Artikel
Sprache:eng
Schlagworte:
Astrophysics
High Energy Astrophysical Phenomena
Physics
Sciences of the Universe
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Zusammenfassung:A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250  GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.141102