Total Neutron Cross Section and Resonance Parameters of Promethium-147

J. W. Codding, Jr.; R. L. Tromp; F. B. Simpson

doi:dx.doi.org/10.13182/NSE71-A21246

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Total Neutron Cross Section and Resonance Parameters of Promethium-147

J. W. Codding, Jr., R. L. Tromp, F. B. Simpson

Nuclear Science and Engineering / Volume 43 / Number 1 / January 1971 / Pages 58-65

Technical Paper / dx.doi.org/10.13182/NSE71-A21246

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The total neutron cross section of ¹⁴⁷Pm has been measured from 0.01 to 1000 eV, using compacted oxide samples in the Materials Testing Reactor (MTR) fast chopper. After correcting the data for decay product ¹⁴⁷Sm content and water contaminant bias, the total cross section of ¹⁴⁷Pm at 0.0253 eV was found to be b. Resonance parameters were determined up to 250 eV by shape-fitting and area analysis, and a negative energy resonance has been postulated to fit the data at thermal. From these parameters a resonance absorption integral of 2192 ± 100 b and a neutron s-wave strength function have been obtained.