as. Co M.H

• Main Authors: R. Sina A, S. Swordy I, J. Wu A, J. Yang C
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Scientfic balloon payloads; CREAM; Cosmic-ray measurements; Particle detectors; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.452.3707; http://www.atic.umd.edu/pub/pdf_052504/seo.pdf

energy scale of 1015 eV in a series of ultra long duration balloon (ULDB) flights. The first flight is planned to be launched from man-made accelerators became available to study the details of particle properties and nuclear interactions. The cosmic rays are comprised of essentially all the elements in the periodic table. With notable exceptions, to result from energetic processes in the galaxy, proba-bly from supernova explosions. However, the origin of high-energy cosmic rays is still a mystery because their energies extend several orders of magnitude beyond the limit thought possible for supernova shock waves. The cosmic-ray spectral features known as the ‘‘knee’ ’ and the ‘‘ankle’ ’ are believed to reflect changes in sources, h 33 * Corresponding author. Tel.: [phone]; fax: [phone]-Antarctica in December 2004. The goal is to observe cosmic-ray spectral features and/or abundance changes that might signify a limit to supernova acceleration. The particle charge ðZÞ measurements will be made with a timing-based charge detector and a pixelated silicon charge detector to minimize the effect of backscatter from the calorimeter. The particle energy measurements will be made with a transition radiation detector (TRD) for Z> 3 and a sampling tungsten/scintillator calorimeter for ZP 1 particles, allowing inflight cross calibration of the two detectors. The status of the payload construction and flight preparation are reported in this paper.