Abstract
Monochromatic photons obtained from thermal-neutron capture in iron were used for exciting nuclear levels in the energy region between 6 and 9 MeV. Angular distribution of the elastically scattered radiation was carried out for the determination of the spins of the resonance levels. Total and ground-state radiation widths of ten resonance levels in various isotopes were measured using self-absorption, temperature variation, and absolute scattering cross-section measurements. The parity of six resonance levels was measured using a Compton polarimeter, and strong transitions were found in and ; the character of four transitions was found to be . The observed total radiation widths of these bound levels were found to have the same magnitude as those of unbound levels obtained in neutron resonances, which indicate that is continuous across the () threshold.
- Received 23 April 1970
DOI:https://doi.org/10.1103/PhysRevC.2.1144
©1970 American Physical Society