The electron avalanche statistics was mainly developed in the approximation of a single electron initiation, following Furry and exponential distributions. The electron avalanche statistics is now generalized relying on the multielectron initiation and the negative binomial distribution (NBD). In an extreme case, for the probability of finding n electrons in an avalanche, the following approximations are applied: a) a Furry/exponential distribution for a single initiating electron (k = 1); b) a Gaussian distribution for the multielectron initiation (k 1). The multielectron initiation leads to a deviation of electron number distributions from exponential ones (i.e. an underpopulation at low electron numbers). In this case, the avalanche statistics is successfully described by NBDs. Statistical models based on NBDs are supported by a Monte Carlo simulation of the avalanche size distributions.
K: Charge transport and multiplication in gas; Ionization and excitation processes; Analysis and statistical methods; Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc) 1Corresponding author.