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BOND ET AL.The liquidJIiquid extraction of Am(III) from hydrochloric acid solutions with chloroform solutions of2,6-bis[(diphenylphosphino)methyJ]pyridine N,P,P'-trioxide (ENOPOPO) is described. ENOPOPO exhibits modest extraction ability for arnericium(lII) (D Am=2.2 at 5 M HCI) and can be efficiently back extracted from the organic phase at 0.1 M HC!. The ligand dependency data suggest that three ligand molecules are coordinated to the americium in the extraction complex. Additional aspects of the extraction mechanism are described.

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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.