Radiochemical Determination of Neutron Capture Cross Sections of 241Am.

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  • Radiochemical Determination of Neutron

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The thermal neutron capture cross sections and the neutron capture resonance integrals of 241Am leading to the production of the isomer 242mAm and the ground-state 242gAm were measured radiochemically by the Cd-ratio technique with neutron flux monitors of Co/Al and Au/Al alloy. Highly-purified 241Am targets were irradiated in an aluminum capsule by using JMTR. The neutron fluxes and their epithermal neutron fractions were determined by measuring γ-rays of 60Co and 198Au. The yields of 242mAm and 242gAm were decided by analyzing growth and decay curves of the α-ray activity ratios 242Cm/241Am. The resultant thermal neutron capture cross sections are 85.7±6.3b and 768±58b for 242mAm and 242gAm, and the resonance integrals 114±7b and 1, 694±146b, respectively. The differences between the present results and the evaluated values by Mughabghab are 38-59%. The isomeric ratios, g/(m+g), of 0.90±0.09 for thermal neutrons and 0.94±0.11 for epithermal neutrons are, however, almost consistent with evaluated values.

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