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
Date Issued
03 April 2013
Access level
open access
Resource Type
journal article
Author(s)
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.
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.
RWTH Aachen University
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. © 2013 American Physical Society.
Volume
110
Issue
14
Language
English
OCDE Knowledge area
Física de partículas, Campos de la Física
Astronomía
Scopus EID
2-s2.0-84876003828
Source
Physical Review Letters
ISSN of the container
10797114
Sources of information:
Directorio de Producción Científica
Scopus