Abrupt Change in Radiation-Width Distribution for Sm147 Neutron Resonances
Abstract
We obtained the total radiation widths of s-wave resonances through an R-matrix analysis of Sm147(n,γ) cross sections. Distributions of these widths differ markedly for resonances below and above En=300eV, which is in stark contrast to long-established theory. We show that this change, as well as a similar change in the neutron-width distribution reported previously, is reflected in abrupt increases in both the average Sm147(n,γ) cross section and fluctuations about the average near 300 eV. Such effects could have important consequences for applications such as nuclear astrophysics and nuclear criticality safety.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2012
- DOI:
- 10.1103/PhysRevLett.108.142502
- arXiv:
- arXiv:1202.0244
- Bibcode:
- 2012PhRvL.108n2502K
- Keywords:
-
- 24.30.Gd;
- 24.60.Dr;
- 24.60.Lz;
- 25.40.Lw;
- Other resonances;
- Statistical compound-nucleus reactions;
- Chaos in nuclear systems;
- Radiative capture;
- Nuclear Experiment;
- Astrophysics - Solar and Stellar Astrophysics;
- Nuclear Theory
- E-Print:
- 5 pages, 4 figures