Energy spectra of H and He from the ATIC-2 experiment
The Advanced Thin Ionization Calorimeter (ATIC) experiment measures the energy spectra of individual elements, from H to Fe, in the energy region from about 100 GeV to tens of TeV. ATIC was flown twice on long-duration balloon flights around the South Pole, 12/00-1/01 (ATIC-1), and 12/02-1/03 (ATIC-2). En-ergy deposit spectra for H and He from both flights are presented. The data from ATIC-2 (18 days) show superior resolution and preliminary analysis indicates evolving energy spectra (i.e. becoming harder with increasing energy) consistent with changes expected from propagation models. The data also suggest a slightly steeper source spectrum for H than for He.
Publication Source (Journal or Book title)
29th International Cosmic Ray Conference, ICRC 2005
Wefel, J., Adams, J., Ahn, H., Bashindzhagyan, G., Batkov, K., Chang, J., Christl, M., Fazely, A., Ganel, O., Gunasingha, R., Guzik, T., Isbert, J., Kim, K., Kouznetsov, E., Panasyuk, M., Panov, A., Schmidt, W., Seo, E., Sokolskaya, N., Wu, J., & Zatsepin, V. (2005). Energy spectra of H and He from the ATIC-2 experiment. 29th International Cosmic Ray Conference, ICRC 2005, 3, 105-108. Retrieved from https://digitalcommons.lsu.edu/physics_astronomy_pubs/5505