Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1885297 | Radiation Measurements | 2010 | 4 Pages |
Abstract
Neutron energy spectrum from 7 to 180Â MeV, photon energy spectrum from 4 to 50Â MeV and proton energy spectrum from 94 to 145Â MeV were measured simultaneously using a phoswich-type neutron detector with particle discrimination methods at atmospheric depth of 249Â g/cm2, a vertical cut-off rigidity of 10.2Â GV and at a heliocentric potential of 312Â MV. We compared our results with other measured and calculated particle energy spectra. Our measured results give a large, sharp neutron peak around 70Â MeV, although Bonner balls show a broad peak around 100Â MeV due to low energy resolution. The measured photon and proton spectra are between the calculated energy spectra. This onboard study provides the first experimental neutron energy spectrum over 10Â MeV with a high-energy resolution.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
M. Takada, K. Yajima, H. Yasuda, T. Sato, T. Nakamura,