$High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station$

High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station

A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results s...

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Veröffentlicht in:	Physical review letters 2014-09, Vol.113 (12), p.121101-121101, Article 121101
Hauptverfasser:	Accardo, L, Aguilar, M, Aisa, D, Alpat, B, Alvino, A, Ambrosi, G, Andeen, K, Arruda, L, Attig, N, Azzarello, P, Bachlechner, A, Barao, F, Barrau, A, Barrin, L, Bartoloni, A, Basara, L, Battarbee, M, Battiston, R, Bazo, J, Becker, U, Behlmann, M, Beischer, B, Berdugo, J, Bertucci, B, Bigongiari, G, Bindi, V, Bizzaglia, S, Bizzarri, M, Boella, G, de Boer, W, Bollweg, K, Bonnivard, V, Borgia, B, Borsini, S, Boschini, M J, Bourquin, M, Burger, J, Cadoux, F, Cai, X D, Capell, M, Caroff, S, Carosi, G, Casaus, J, Cascioli, V, Castellini, G, Cernuda, I, Cerreta, D, Cervelli, F, Chae, M J, Chang, Y H, Chen, A I, Chen, H, Cheng, G M, Chen, H S, Cheng, L, Chikanian, A, Chou, H Y, Choumilov, E, Choutko, V, Chung, C H, Cindolo, F, Clark, C, Clavero, R, Coignet, G, Consolandi, C, Contin, A, Corti, C, Coste, B, Cui, Z, Dai, M, Delgado, C, Della Torre, S, Demirköz, M B, Derome, L, Di Falco, S, Di Masso, L, Dimiccoli, F, Díaz, C, von Doetinchem, P, Du, W J, Duranti, M, D'Urso, D, Eline, A, Eppling, F J, Eronen, T, Fan, Y Y, Farnesini, L, Feng, J, Fiandrini, E, Fiasson, A, Finch, E, Fisher, P, Galaktionov, Y, Gallucci, G, García, B, García-López, R, Gast, H, Gebauer, I, Gervasi, M, Ghelfi, A
Format:	Artikel
Sprache:	eng
Schlagworte:	Alpha Magnetic Spectrometer Astrophysics Cosmology and Extra-Galactic Astrophysics Energy measurement International Space Station Physics Positrons Primary cosmic rays Sciences of the Universe Statistics
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Zusammenfassung:	A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200 GeV the positron fraction no longer exhibits an increase with energy.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.113.121101