Determination of the Neutron-Proton Ratio in Primary Cosmic Rays
- 11 July 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 39 (2) , 112-115
- https://doi.org/10.1103/physrevlett.39.112
Abstract
The charge ratios of muons produced by the interaction of 400-GeV protons with thick copper targets were measured and the +/- ratios were found to be much larger than similar ratios for muons in the secondary cosmic rays. The difference between these charge ratios is taken to indicate that the neutron/proton ratio in the primary cosmic rays is quite large: i.e., of the order of 25:75.Keywords
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