Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.132003
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Funding
- U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177, DE-AC02-06CH11357]
- DOE [DE-SC0016577, DE-AC02-05CH11231]
- National Science Foundation [NSF-PHY-1405814, NSF-PHY-1714809]
- Kent State University Research Council
- Pazy Foundation
- Israeli Science Foundation [136/12, 1334/16]
- Italian Institute of Nuclear Physics
- U.S. Department of Energy (DOE) [DE-SC0016577] Funding Source: U.S. Department of Energy (DOE)
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The MARATHON experiment determines the ratio of the nucleon F-2 structure functions, F-2(n)/F-2(p), through measurements of deep inelastic scattering of electrons from H-3 and He-3 nuclei. The experiment achieves significant improvements compared to previous measurements and compares the results to theoretical calculations and empirical determinations of the ratio.
The ratio of the nucleon F-2 structure functions, F-2(n)/F-2(p), is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from H-3 and He-3 nuclei. The experiment was performed in the Hall A Facility of Jefferson Lab using two high-resolution spectrometers for electron detection, and a cryogenic target system which included a low-activity tritium cell. The data analysis used a novel technique exploiting the mirror symmetry of the two nuclei, which essentially eliminates many theoretical uncertainties in the extraction of the ratio. The results, which cover the Bjorken scaling variable range 0.19 < x < 0.83, represent a significant improvement compared to previous SLAC and Jefferson Lab measurements for the ratio. They are compared to recent theoretical calculations and empirical determinations of the F-2(n)/F-2(p) ratio.
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