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First measurements of cosmic-ray nuclei at high energy with CREAM |
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| Authors: | SP Wakely HS Ahn P Allison MG Bagliesi JJ Beatty G Bigongiari P Boyle TJ Brandt JT Childers NB Conklin S Coutu MA DuVernois O Ganel JH Han JA Jeon KC Kim MH Lee L Lutz P Maestro A Malinine PS Marrocchesi S Minnick SI Mognet SW Nam S Nutter IH Park JH Park NH Park ES Seo R Sina SP Swordy J Wu J Yang YS Yoon R Zei SY Zinn |
| Institution: | 1. Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL 60637, USA;2. Institute for Science and Technology, University of Maryland, College Park, MD 20742, USA;3. Department of Physics, University of Maryland, College Park, MD 20742, USA;4. Department of Physics, Ohio State University, Columbus, OH 43210, USA;5. Department of Physics, University of Siena and INFN, Via Roma 56, 53100 Siena, Italy;6. School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA;g Department of Physics, Penn State University, University Park, PA 16802, USA;h Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea;i Department of Physics, Kent State University, Tuscarawas, New Philadelphia, OH 44663, USA;j Department of Physics and Geology, Northern Kentucky University, Highland Heights, KY 41099, USA |
| Abstract: | The balloon-borne cosmic-ray experiment CREAM-I (Cosmic-Ray Energetics And Mass) recently completed a successful 42-day flight during the 2004–2005 NASA/NSF/NSBF Antarctic expedition. CREAM-I combines an imaging calorimeter with charge detectors and a precision transition radiation detector (TRD). The TRD component of CREAM-I is targeted at measuring the energy of cosmic-ray particles with charges greater than Z ∼ 3. A central science goal of this effort is the determination of the ratio of secondary to primary nuclei at high energy. This measurement is crucial for the reconstruction of the propagation history of cosmic rays, and consequently for the determination of their source spectra. First scientific results from this instrument are presented. |
| Keywords: | 95 85 Ry 95 55Vj 96 50 Sb 29 40 Cs 29 40 Ka 29 40 Mc |
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