Journal
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
Volume 196, Issue -, Pages 110-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysbps.2009.09.019
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The response of the X-ray emulsion chamber (XREC) is analyzed. The code GEANT 3.21 has been adopted for simulating the measurement procedure in the PAMIR XREC experiment. The contribution of below threshold gamma-quanta, the mutual influence of neighboring electromagnetic cascades in gamma-families; identification against a background by Raleigh's criterion are taken into account. Our earlier publications overestimated the family energy by about (10 divided by 20)% and the real family angular distribution is less steeper than the measured one. Consequently, the gamma-family intensity should be reduced by 1.10 divided by 1.15 times. It means, that the Pamir experiment estimate of the PCR proton fraction in the energy region 1 divided by 100PeV slowly decreases from 25% to 20%.
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