Measurement of theAm241(n,2n) reaction cross section from 7.6 MeV to 14.5 MeV

Abstract

The (n, 2n) cross section of the radioactive isotope 241 Am (T 1/2 = 432.6 y) has been measured in the incident neutron energy range from 7.6 to 14.5 MeV in steps of a few MeV using the activation technique. Monoenergetic neutron beams were produced via the 2 H(d, n) 3 He reaction by bombarding a pressurized deuterium gas cell with an energetic deuteron beam at the TUNL 10-MV Van de Graaff accelerator facility. The induced γ -ray activity of 240 Am was measured with high-resolution HPGe detectors. The cross section was determined relative to Al, Ni, and Au neutron activation monitor foils, measured in the same geometry. Good agreement is obtained with previous measurements at around 9 and 14 MeV, whereas for a large discrepancy is observed when our data are compared to those reported by Perdikakis et al. near 11 MeV. Very good agreement is found with the END-B/VII evaluation, whereas the JENDL-3.3 evaluation is in fair agreement with our data.

Cross-section measurements of neutron-induced reactions on GaAs using monoenergetic beams from 7.5 to 15 MeV

“…At neutron energies higher than 10 MeV, the 2 H(d, n) 3 He reaction is known to produce low energy neutrons by the break-up of the incident or target deuteron, 2 H(d,np) 2 H, in the gas cell. We have used time-of-flight measurements [17] at different neutron energies from 8 to 14 MeV in order to estimate the relative yields of the break-up and the monoenergetic neutrons. The present measurements were carried out in the same experimental setup and under the same conditions of gas cell pressure, geometry, and other important factors as in [17].…”

“…We have used time-of-flight measurements [17] at different neutron energies from 8 to 14 MeV in order to estimate the relative yields of the break-up and the monoenergetic neutrons. The present measurements were carried out in the same experimental setup and under the same conditions of gas cell pressure, geometry, and other important factors as in [17]. The yield distribution for the 14 MeV neutrons from the said measurements is illustrated in Fig.…”

“…Measurements were carried out in ref. [17] with an empty gas cell in order to estimate the yield distribution of these neutrons. The results of these gasout measurements are plotted in Fig.…”

Cross Section Measurements of Neutron Induced Reactions on GaAs using Monoenergetic Beams from 7.5 to 15 MeV

“…The correction required due to interference from the low energy neutrons depends on the specific reaction, the respective threshold and the shape of the excitation function. Since the present measurements were carried out in the same experimental conditions as in [2], the same analysis has been applied to the break-up corrections described in Eq. (2).…”

High resolution measurements of theAm241(n,2nSage1, Semkova2, Bouland3 et al. 2010Phys. Rev. C260110View full textAdd to dashboardCite

“…Two references report measured cross sections for the 241 Am(n,2n) reaction at neutron energies around 14 MeV [1,2], and two recent works report data for neutron energies from threshold to 14 MeV [3,4]. At 14 MeV, the data of Refs.…”