@article{e81a61c9ddc0433f80d9524f0dfd2d1f,
title = "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",
abstract = "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 6.8×106 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.",
author = "{AMS Collaboration} and M. Aguilar and G. Alberti and B. Alpat and A. Alvino and G. Ambrosi and K. Andeen and H. Anderhub and L. Arruda and P. Azzarello and A. Bachlechner and F. Barao and B. Baret and A. Barrau and L. Barrin and A. Bartoloni and L. Basara and A. Basili and L. Batalha and J. Bates and R. Battiston and J. Bazo and R. Becker and U. Becker and M. Behlmann and B. Beischer and J. Berdugo and P. Berges and B. Bertucci and G. Bigongiari and A. Biland and V. Bindi and S. Bizzaglia and G. Boella and {De Boer}, W. and K. Bollweg and J. Bolmont and B. Borgia and S. Borsini and Boschini, {M. J.} and G. Boudoul and M. Bourquin and P. Brun and M. Bu{\'e}nerd and J. Burger and W. Burger and F. Cadoux and Cai, {X. D.} and M. Capell and D. Casadei and J. Casaus and Liqiu Wang",
year = "2013",
month = apr,
day = "3",
doi = "10.1103/PhysRevLett.110.141102",
language = "English",
volume = "110",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "14",
}