S
S. A. Stephens
Researcher at Tata Institute of Fundamental Research
Publications - 27
Citations - 1405
S. A. Stephens is an academic researcher from Tata Institute of Fundamental Research. The author has contributed to research in topics: Cosmic ray & Spectrometer. The author has an hindex of 16, co-authored 27 publications receiving 1377 citations.
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Journal ArticleDOI
The cosmic-ray electron and positron spectra measured at 1 au during solar minimum activity
Mirko Boezio,Per Carlson,Tom Francke,N. Weber,M. Suffert,M. Hof,W. Menn,M. Simon,S. A. Stephens,Roberto Bellotti,F. Cafagna,M. G. Castellano,M. Circella,C. De Marzo,N. Finetti,P. Papini,S. Piccardi,Piero Spillantini,Marco Ricci,Marco Casolino,M. P. De Pascale,A. Morselli,P. Picozza,Roberta Sparvoli,Guido Barbiellini,Ulisse Bravar,P. Schiavon,Andrea Vacchi,N. Zampa,Catia Grimani,John Mitchell,Jonathan F. Ormes,R. E. Streitmatter,R. L. Golden,Steven Stochaj +34 more
TL;DR: In this article, the authors used the NMSU-WIZARD/CAPRICE94 balloon-borne magnet spectrometer equipped with a solid radiator Ring Imaging Cerenkov (RICH) detector, a time-of-ight system, a tracking device consisting of drift chambers and multiwire proportional chambers, and a silicon-tungsten calorimeter.
Journal ArticleDOI
The cosmic-ray proton and helium spectra between 0.4 and 200 gv
Mirko Boezio,Per Carlson,Tom Francke,N. Weber,M. Suffert,M. Hof,W. Menn,M. Simon,S. A. Stephens,Roberto Bellotti,F. Cafagna,M. G. Castellano,M. Circella,C. De Marzo,N. Finetti,P. Papini,S. Piccardi,P. Spillantini,Marco Ricci,Marco Casolino,M. P. De Pascale,A. Morselli,P. Picozza,Roberta Sparvoli,Guido Barbiellini,Ulisse Bravar,P. Schiavon,Andrea Vacchi,N. Zampa,John Mitchell,Jonathan F. Ormes,R. E. Streitmatter,R. L. Golden,Steven Stochaj +33 more
TL;DR: The first time a ring-imaging Cerenkov detector was used together with an imaging calorimeter in a balloon-borne experiment was reported in this paper, where 516,463 hydrogen and 32,457 helium nuclei were identi-ed in the rigidity range 0.4 to 200 GV and 1.2 to 4.2 GV, respectively.
Journal ArticleDOI
THE COSMIC-RAY ANTIPROTON FLUX BETWEEN 3 AND 49 GeV
Mirko Boezio,V. Bonvicini,P. Schiavon,Andrea Vacchi,N. Zampa,D. Bergström,Per Carlson,Tom Francke,S. Grinstein,M. Suffert,M. Hof,J. Kremer,W. Menn,M. Simon,S. A. Stephens,M. Ambriola,Roberto Bellotti,F. Cafagna,F. Ciacio,M. Circella,C. De Marzo,N. Finetti,P. Papini,S. Piccardi,P. Spillantini,E. Vannuccini,S. Bartalucci,Marco Ricci,Marco Casolino,M. P. De Pascale,A. Morselli,P. Picozza,Roberta Sparvoli,John Mitchell,Jonathan F. Ormes,R. E. Streitmatter,Ulisse Bravar,Steven Stochaj +37 more
TL;DR: In this paper, a new measurement of the cosmic ray antiproton spectrum was reported, based on the data collected by the balloon-borne experiment CAPRICE98, which was launched on 1998 May 28, 29 from Fort Sumner, New Mexico.
Journal ArticleDOI
The Cosmic-Ray Antiproton Flux between 0.62 and 3.19 GeV Measured Near Solar Minimum Activity
Mirko Boezio,Per Carlson,Tom Francke,N. Weber,M. Suffert,M. Hof,W. Menn,M. Simon,S. A. Stephens,Roberto Bellotti,F. Cafagna,M. G. Castellano,M. Circella,G. de Cataldo,C. De Marzo,N. Giglietto,P. Spinelli,M. Bocciolini,P. Papini,A. Perego,S. Piccardi,P. Spillantini,G. Basini,Marco Ricci,Antonio Codino,N. Finetti,Catia Grimani,M. Candusso,Marco Casolino,M. P. De Pascale,A. Morselli,P. Picozza,Roberta Sparvoli,Guido Barbiellini,Ulisse Bravar,P. Schiavon,A. Vacchi,N. Zampa,John Mitchell,Jonathan F. Ormes,R. E. Streitmatter,R. L. Golden,S. J. Stochaj +42 more
TL;DR: In this article, the absolute antiproton Nux and the antiproto-proton ratio in the energy range 0.62E3.19 GeV at the top of the atmosphere were measured by the balloon-borne experiment CAPRICE Nown from Lynn Lake, Manitoba, Canada on 1994 August 8E9.
Journal ArticleDOI
Measurement of the Positron to Electron Ratio in the Cosmic Rays above 5 GeV
R. L. Golden,Steven Stochaj,S. A. Stephens,F. Aversa,Guido Barbiellini,Mirko Boezio,Ulisse Bravar,A. Colavita,F. Fratnik,P. Schiavon,A. Vacchi,N. Zampa,John Mitchell,Jonathan F. Ormes,R. E. Streitmatter,Roberto Bellotti,F. Cafagna,M. G. Castellano,M. Circella,G. de Cataldo,C. De Marzo,N. Giglietto,B. Marangelli,A. Rain,P. Spinelli,M. Bocciolini,N. Finetti,P. Papini,A. Perego,S. Piccardi,P. Spillantini,G. Basini,F. Massimo Brancaccio,Marco Ricci,Maria Teresa Brunetti,Antonio Codino,Catia Grimani,Mauro Menichelli,V. Bidoli,M. Candusso,Marco Casolino,M. P. De Pascale,A. Morselli,P. Picozza,R. Sparvoli,M. Hof,W. Menn,M. Simon +47 more
TL;DR: In this paper, two completely new instruments, a transition radiation detector and a silicon-tungsten imaging calorimeter, were added to the magnet spectrometer, which provided a proton rejection factor better than 3 × 104.