keV Resonance Neutron Capture in Iron

Abstract

Resonance behaviour has been observed at a number of neutron energies between 5 and 90 keY. Transition intensities show strong fluctuations with neutron energy. The presence of p-and/or d-wave capture is inferred from the occurrence of transitions to high spin states. A distribution of reduced widths for low spin states suggests some departure from statistical processes, particularly for the strongest transitions.

Measurement of partial radiation widths of high energy transitions from keV capture resonances in56Fe and58,60Ni

“…Intensity ratios of the observed ?-ray lines can be compared with keV capture results reported by Kenny [19]. The intensity ratio of the ground state transitions for the 34.25 and 59.25keV resonances obtained in the present investigation, which is quite different from threshold photoneutron measurements [16,18], is in fair agreement with the results of [19] at average neutron energies around 36 and 52keV. An equally good agreement with [19] was found in the case of the ?-transition to the first excited state in the 38.38 keV resonance.…”

“…The intensity ratio of the ground state transitions for the 34.25 and 59.25keV resonances obtained in the present investigation, which is quite different from threshold photoneutron measurements [16,18], is in fair agreement with the results of [19] at average neutron energies around 36 and 52keV. An equally good agreement with [19] was found in the case of the ?-transition to the first excited state in the 38.38 keV resonance. Discrepancies in some other intensity ratios between our results and [19] may be attributed to the different neutron energy resolution.…”

“…An equally good agreement with [19] was found in the case of the ?-transition to the first excited state in the 38.38 keV resonance. Discrepancies in some other intensity ratios between our results and [19] may be attributed to the different neutron energy resolution.…”