12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room F(201/202/203/204)

[CRD094] Estimated Pulse Height Spectrum with Pulse Pile-Up Correction for Neutron Monitor of Mexico City


  • Rocío GARCÍA

Primary authors

  • Rocío GARCÍA (Instituto de Geofísica, Universidad Nacional Autónoma de México)



The operating principles of Neutron Monitors are nuclear reactions within the proportional counters. The output signal of these is an electric pulse for every secondary cosmic ray particle that interacts with the detector. The amplitude of the pulse signal reflects the amount of charge generated on each individual interaction. The estimated pulse height distribution provides an energy resolution index, it is a useful parameter to determine the proper operation of the detector. The random nature of the cosmic radiation, in addition to the operating characteristics of both the detector and the associated electronic system, lead to a phenomenon called pulse pile-up. The effect of the pulse pile-up on the recorded pulse height distribution, may be seen in the added wings of the main energy peaks of the distribution. This reduces the energy resolution of the instrument. In the present work, we describe an algorithm that takes advantage of mathematical techniques of digital signal processing with the purpose of calculating the pulse amplitude distribution reducing the distortion caused by pulse pile-up. The algorithm was written in python, using numpy and scipy libraries. Finally, we present the results of applying the algorithm to signals from the neutron monitor operating in Mexico City.