Comparison of hadron shower data in the PAMELA experiment with Geant 4 simulations

[摘要] The sampling imaging electromagnetic calorimeter of ≈ 16.3 radiation lengths and ≈ 0.6 nuclear interaction length designed and constructed by the PAMELA collaboration as a part of the large magnetic spectrometer PAMELA. Calorimeter consists of 44 single-sided silicon sensor planes interleaved with 22 plates of tungsten absorber (thickness of each tungsten layer 0.26 cm). Silicon planes are composed of a 3 × 3 matrix of silicon detectors, each segmented into 32 read-out strips with a pitch of 2.4 mm. The orientation of the strips of two consecutive layers is orthogonal and therefore provides two-dimensional spatial information. Due to the high granularity, the development of hadronic showers can be study with a good precision. In this work a Monte Carlo simulations (based on Geant4) performed using different available models, and including detector and physical effects, compared with the experimental data obtained on the near Earth orbit. Response of the PAMELA calorimeter to hadronic showers investigated including total energy release in calorimeter and transverse shower profile characteristics.

[发布机构] Yaroslavl State P. G. Demidov University, 150000 Sovietskaya st., 14, Yaroslavl, Russia^1;National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow; 115409, Russia^2

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Electromagnetic calorimeter;High granularity;Magnetic spectrometers;Near earth orbit;Nuclear interaction;Physical effects;Radiation lengths;Spatial informations