Abstract

CALLE GARCIA, Carla A.  and  RIVERA BRETEL, Hugo M.. Study of the trigger efficiency of a surface arrangement of detectors for the ALPACA project using simulations and analytical methods. Revista Boliviana de Física [online]. 2018, vol.33, n.33, pp.3-12. ISSN 1562-3823.

ABSTRACT The ALPACA (Andes Large area Particle detector for Cosmic ray physics and Astronomy) experiment is a scientific project whose main objective is the determination of the origin of galactic cosmic rays. The project is in the planning stage and its experimental array will con-sist of 401 surface level scintillation detectors and 8 underground water pools that will act as Cherenkov muon detectors. The experiment will be set up near the mountain Chacaltaya, on Cerro Estuquera at 4740 m above sea level (m a.s.l). We have studied the trigger efficiency of the surface detector array using extensive air showers generated with Monte Carlo simula-tions for three types of primary cosmic rays: protons, iron nuclei and gamma rays. Energies between 10^12,00and 10^15,25 eV were considered and zenith angles between 0 and 47 degrees. We found that the surface array is 100% efficient for the detection of the three types of primary particles considered with energies greater than the saturation energy E_sat = 10^14,25 eV, regardless of its arrival direction, energy and shower core position over the array of detectors.

Keywords : Molecular dynamics; Interatomic distances and angles; Polymers; elastomers; plastics.

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