E-viri
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Ashton, F; Nash, W. F.; Wolfendale, Arnold Whittaker
Proceedings of the Royal Society of London. Series A, Mathematical and physical sciences, 11/1959, Letnik: 253, Številka: 1273Journal Article
A direct determination has been made of the cosmic ray spectrum underground at a depth of 38 m. w. e. under Castle Rock, Nottingham. The spectrum is based on measurements of 1010 particles traversing a magnetic spectrograph having a maximum detectable momentum of 8 GeV/c. By comparing this spectrum with the ground-level spectrum the energy loss of fast μ-mesons in penetrating the 38 m. w. e. of rock has been determined. It is shown that the energy loss for μ-mesons in the momentum range 7 to 15 GeV/c is as expected by theory, the collision process being responsible for most of the loss.
