Abstract
The neutron radiative capture cross section of was measured for neutron energies between 40 and 1000 kev and at thermal energy. The reaction was detected by observing the beta decay of in a natural LiI crystal exposed to a flux of monoenergetic neutrons. The cross sections for the reaction were obtained relative to the known cross sections for the and the reactions which also took place in the crystal. The cross section decreases from a value of 50× barn at 40 kev to 5× barn at 1000 kev. A maximum in the cross section was found at 250 kev, corresponding to a known level in at 2.28 Mev. The observed radiation width of this level was 0.07±0.03 ev.
- Received 22 December 1958
DOI:https://doi.org/10.1103/PhysRev.114.1037
©1959 American Physical Society