Multiplicity Distributions of the Charged Particles at the Maximum of Electromagnetic Showers Initiated by 5–1000 GeV Electrons in Fe, W, and Pb

Denisov, S. P.; Goryachev, V. N.

doi:10.1134/s1063778818110236

Phys. Atom. Nuclei

2018

DOI: 10.1134/s1063778818110236

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Multiplicity Distributions of the Charged Particles at the Maximum of Electromagnetic Showers Initiated by 5–1000 GeV Electrons in Fe, W, and Pb

S. P. Denisov

V. N. Goryachev

Abstract: Charged particles multiplicity distributions at the maximum of electromagnetic showers initiated by 5 to 1000 GeV electrons in Fe, W, and Pb were calculated using GEANT4. It is shown that they are reasonably well fitted by the inverse sum of two exponents and the energy dependence of the average multiplicity follows power law with the power of ~0.95 for all studied materials.

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Cited by 2 publications

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Distributions of the charged particles in the electromagnetic showers initiated by 5-1000 GeV electrons in Fe, W and Pb

Denisov

Goryachev

2019

J. Phys.: Conf. Ser.

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Distributions of the charged particles multiplicities in the electromagnetic showers initiated by 10 to 1000 GeV electrons in lead are calculated using GEANT4. It is shown that they are well fitted by the inverse sum of two exponents. The evolution of the multiplicity distribution shapes as a function of the lead depth is discussed. An estimate of the energy resolution of a simple e,γ detector consisting of a high Z convertor and a counter of the shower electrons and positrons is presented. IntroductionDetectors consisting of a lead converter and a position sensitive detector behind it are widely used in HEP experiments for e,γ/hadron and γ/π 0 separations and for e, γ coordinate and energy measurements [1][2][3][4][5][6][7][8][9][10][11][12][13]. They are often called preshower or shower maximum detectors. Their characteristics depend on the fluctuations of the charge particle flux in electromagnetic (EM) showers initiated in the converter by the primary e,γ. In our previous studies [14] it is shown that multiplicity distributions at the converter depth of t max , corresponding to the maximum of the charged particles flux in the EM showers, are asymmetric and have long tails at the low multiplicities due to late developments of some showers. They are well described by the inverse sum of two exponents:

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Distributions of the charged particles in the electromagnetic showers initiated by 5-1000 GeV electrons in Fe, W and Pb

Denisov

Goryachev

2019

J. Phys.: Conf. Ser.

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Properties of a Simple е/γ Detector Consisting of a Lead Convertor and a Hodoscope

2020

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The results of the calculations of coordinate resolution and hadron rejection factor for a simple е/γ detector consisting of a lead converter followed by a hodoscope are presented. For the simulation of showers, initiated in the converter by electrons and hadrons with energies upto 1 TeV GEANT4 is used. It is shown that the best coordinate resolution for electrons is achieved when the converter thickness is closed to the position t max of the shower maximum. For example, at 200 GeV with 2 mm strip width hodoscope it is equal to σ=89 microns provided a "truncated mean" coordinate estimation is used. The optimal thickness of the converter for hadron rejection is also close to t max . For 200 GeV beam of electrons and protons the rejection factor of 10 -4 for 0.9 electron detection efficiency can be reached using only data on charged particles multiplicities. Information on the spatial distribution of the shower particles after the converter allows to enhance further the rejection by several times.

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Multiplicity Distributions of the Charged Particles at the Maximum of Electromagnetic Showers Initiated by 5–1000 GeV Electrons in Fe, W, and Pb

Cited by 2 publications

References 23 publications

Distributions of the charged particles in the electromagnetic showers initiated by 5-1000 GeV electrons in Fe, W and Pb

Distributions of the charged particles in the electromagnetic showers initiated by 5-1000 GeV electrons in Fe, W and Pb

Properties of a Simple е/γ Detector Consisting of a Lead Convertor and a Hodoscope

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