Thermal-Neutron Capture Cross Sections and Capture Resonance Integrals of Americium-241

Measurement of the thermal neutron capture cross section and resonance integral of Am-241

“…The thermal neutron cross section for 241 Am(n, γ ) 241g Am reaction obtained in the present work was (602 ± 9) b. This value agrees well with the values (624 ± 20) b obtained by Kalebin [8] and (585 ± 12) b obtained by Munghabghab [26] and disagree with the values obtained by Harbour [9] and Shinohara [7] of (748 ± 20) b and (768 ± 58) b, respectively.…”

“…In the present paper the cross section and resonance integral for 241 Am(n, γ ) 241g Am reaction has been investigated. The motivation for this experiment was the discrepancy among the values taken from the literature, which can reach more than 20% [7][8][9].…”

Americium-241 phase I: reevaluation for JEFF-3.1.1 and a step forward

“…The comparison between JEF-2.2 (regenerated) and other evaluated files is summarized in Tables [21] work and the other evaluations comes from the selection made on the experimental datasets, which relies on integral experiments (Bak et al [22], Harbour et al [23], and Gavrilov et al [24]; see Table 7) for the former and on differential measurements for the others (see Table 6 for instance). The results supplied by the integral experiments are in general systematically much higher than the various differential data and this fact is worth to be debated in the next sections.…”

“…Several integral measurements (Bak et al [22], Harbour et al [23], Gavrilov [24], and Shinohara et al [31]) used the Cd ratio technique and so, are dependent on the effective cut-off energy (function of the Cd thickness) which none sharp value falls into the range of the two lowest energy 241 Am resonances. Unfortunately, experimental details on neutron spectra in old integral measurements are in most cases not available and so not reproducible.…”

“…However, when the actual neutron spectrum is rigorously reproduced, reasonable agreement between differential and integral experiments can be established. A notable example is the Cd ratio measurement from Harbour et al [23] (see Table 7). The authors detailed the treatment of both the Cd cut-off energy and the neutron spectrum characterizing their experiment.…”