Neutron Activation Cross Sections of Pm147, Pm148, and Pm148m

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Abstract
The thermal cross sections and the resonance integrals have been measured for the activation of Pm147 to both Pm148 isomers. The thermal activation cross sections are: 124 ± 13 barns to 5.39-day Pm148 and 111 ± 11 barns to 40.6-day Pm148m. The resonance integrals are: 1700 ± 250 barns to 5.39-day Pm148 and 1520 ± 230 barns to 40.6-day Pm148m. Approximate cross sections have been obtained for neutron capture by both Pm148 isomers. The pile cross section of 40.6-day Pm148m is 29,000 ± 5000 barns and is due mainly to thermal neutron capture. The pile cross section of 5.39-day Pm148 is 3,000 ± 2,000 barns and is due mainly to resonance neutron capture.

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