Electromagnetic cascade showers with the LPM effect in standard rock initiated by extremely high-energy (1015 eV to 1021 eV) gamma-rays |
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Authors: | A Misaki |
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Institution: | (1) Department of Physics, Faculty of Sciences, Saitama University, Shimo-Okubo 255, 338 Urawa, Japan;(2) The Institute for China-Japan Study, Shinkawa 5-14-16, Mitaka, 181 Tokyo, Japan |
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Abstract: | Summary High-energy neutrinos produce finally high-energy electromagnetic cascade showers. For the detectio of high-energy neutrinos,
it is necessary to examine the behaviour of the electromagnetic cascade showers in the higher-energy region. It is well known
that the LPM effect plays a decisive role in the electromagnetic cascade shower development at higher energies. In the present
paper, the behaviour of electromagnetic cascade showers including the LPM effect (LPM showers) in standard rock is examined
using the calculational technique developed by Fujimaki and Misaki. In order to clarify the characteristics of LPM showers,
similar calculations are also carried out for cascade showers in the absence of the LPM effect (BH showers). Comparisons between
the two different kinds of cascade showers are made over electron transition curves, track lengths and fractional dissipated
energies. Finally, the strong deviation of LPM showers from the normal BH showers is emphasized. |
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Keywords: | Electromagnetic processes and properties of hadrons |
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