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Manuscript Title: TIERRAS: a package to simulate High Energy Cosmic Ray showers underground, underwater and under-ice
Authors: Matías Tueros, Sergio Sciutto
Program title: TIERRAS for AIRES
Catalogue identifier: AEFO_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 181(2010)380
Programming language: Fortran 77 and C.
Computer: PC, Alpha, IBM, HP, Silicon Graphics and Sun workstations.
Operating system: Linux, DEC Unix, AIX, SunOS, Unix System V.
RAM: 22 Mb bytes
Keywords: Cosmic Rays, Underground Laboratories, Montecarlo Simulations.
PACS: 13.85.Tp, 07.05.Tp, 95.55.Vj.
Classification: 1.1.

External routines: TIERRAS requires AIRES 2.8.4 to be installed on the system. AIRES 2.8.4 can be downloaded from http://www.fisica.unlp.edu.ar/auger/aires/eg_AiresDownload.html

Nature of problem:
Simulation of high and ultra high energy underground particle showers.

Solution method:
Modification of the AIRES 2.8.4 code to accommodate underground conditions.

In AIRES some processes that are not statistically significant on the atmosphere are not simulated. In particular, it does not include muon photo-nuclear processes. This imposes a limitation on the application of this package to a depth of 1 Km of standard rock (or 2.5 Km of water equivalent). Neutrinos are not tracked on the simulation, but their energy is taken into account in decays.

Running time:
A TIERRAS for AIRES run of a 1020 eV shower with statistical sampling (thinning) below 1012 eV and 0.2 weight factor (see [1]) uses approximately 1h of CPU time on an Intel Core 2 Quad Q6600 at 2.4 Ghz. It uses only one core, so 4 simultaneous simulations can be run on this computer. Aires includes a spooling system to run several simultaneous jobs of any type.

[1] Aires UserManual S. Sciutto, AIRES 2.6 user Manual, www.fisica.unlp.edu.ar/aires