Simulation of proton-induced and iron-induced extensive air showers at   extreme energies
  The development of extensive air showers at extreme energies is studied using a simulation model much simpler and cruder, but also more transparent and flexible, than existing sophisticated codes. Evidence for its satisfactory performance is presented. As an illustration, shower elongation rates are evaluated in the $10^{18}$ to $10^{20}$ eV region and compared with recently published data. Lateral distribution functions of both muons and electrons/photons are also briefly discussed. Reliable results are obtained in the comparison between proton-induced and iron-induced showers. 
Do Thi Hoai, Pham Ngoc Diep, Pierre Darriulat, Pham Tuan Anh, Pham   Ngoc Dong, Nguyen Van Hiep, Pham Thi Tuyet Nhung and Ng...
astro-ph.HE hep-ph