Table 2.

Typical uncertainty sources encountered in (n, xn) measurements are tabulated with special emphasis on shapes of correlations. The notation Expi refers to different datasets from the same laboratory.

Unc. source Cor(Expi, Expi) Cor(Expi, Expj) i ≠ j
Timing-spread From TOF →Eout transformation ≠0 for same facility/detector
Neutron-production target Full ≠0 for same facility
Neutron-flux monitoring Gaussian ≠0 for same facility/detector
Sample Full ≠0 for similar target/methods
Geometric effects Full ≠0 for same facility
Attenuation & multiple scatt. Gaussian Facility/methods dependent
Standards & references From libraries From libraries
Detector efficiency (neutrons) Gaussian Depends on efficiency determination
Detector efficiency (γ rays) Full Depends on efficiency determination
Extracting yields Gaussian ≠0 for same facility/detector

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