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We obtained total radiation widths of s-wave resonances through R-matrixanalysis of 147Sm(n,gamma) cross-sections. Distributions of these widths differmarkedly for resonances below and above 300 eV, in stark contrast tolong-established theory. We show that this change, as well as a similar changein the neutron-width distribution reported previously, are reflected in abruptincreases in both the average 147Sm(n,gamma) cross section and fluctuationsabout the average near 300 eV. Such effects could have important consequencesfor applications such as nuclear astrophysics and nuclear criticality safety.

Abrupt Change in Radiation-Width Distribution for 147Sm Neutron Resonances