Delorme, Jean and Ericson, Magda and Ericson, Torleif and Vogel, Petr (1995) Pion and neutron production by cosmic-ray muons underground. Physical Review C, 52 (4). pp. 2222-2230. ISSN 0556-2813 http://resolver.caltech.edu/CaltechAUTHORS:DELprc95
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The production of positive pions and neutrons by cosmic muons at underground sites of various depths is investigated. We first test the equivalent photon method in the particular case of Δ excitation by the muon. We find that this method, when it neglects the momentum dependence of the transverse response, reproduces remarkably well the theoretical muon cross section. This success has lead us to apply the method to higher energies, where it has not been tested. We evaluate in this way the production of positive pions in liquid scintillator from known photo-absorption cross sections. At a shallow depth of 20 meters our estimate reproduces the measurement. As for the neutron emission, we include the obvious sources, such as the giant-resonance excitation, the quasideuteron process, the quasifree pion production as well as neutrons emitted following pion capture. Our evaluation underestimates the number of neutrons produced and finds a too weak dependence on the depth. This suggests that secondary neutron production is important at all depths.
|Additional Information:||©1995 The American Physical Society Received 10 April 1995 We are grateful to Prof. J. Ahrens for data on photoproduction cross sections at high energy, and to Ralph Hertenberger and Mark Chen for numerous discussions regarding their experiment. Part of this work was done while two of us, M.E. and T.E., were visiting Caltech. We would like to thank Prof. Felix Boehm and Caltech for their hospitality. This work was supported in part by the U.S. Department of Energy under Grant No. DE-FG03-88ER40397.|
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|Deposited On:||05 Jun 2006|
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