Resonance and thermal-neutron total cross sections for promethium-147 and promethium-148m
Resonance parameters for /sup 147/Pm and /sup 148m/Pm were determined, and the resonances in /sup 147/Pm were analyzed up to 317 eV. Only one resonance was observed for /sup 148m/Pm; its location at 0.17 eV is important for thermal reactor calculations. Transmission measurements were initially made on four samples of /sup 147/Pm/sub 2/O/sub 3/ containi ng 1.6% of the decay product /sup 147/Sm. Later measurements, made on a mixed sample of (/sup 148m/Pm + /sup 147/ Pm)/sub 2/O/sub 3/ and on /sup 147/Sm, provided resonance parameters for /sup 148m/Pm and an opportunity for a complete reevaluation of the previous /sup 147/ Pm results. Corrections for the samarium content could also be made. Both shape and area analyses were performed. The measured total cross section for /sup 147/ Pm at 0.025 eV was 198 plus or minus 8 b and a capture resonance integral of 2280 plus or minus 200 b was calculated. Using the parameters of the /sup 148m/ Pm resonance at 0.17 eV, a corresponding total thermal-neutron cross section of 10,600 b was obtained. Integral measurements with cadmium-covered samples gave a value of (3.6 plus or minus 2.4) x 10/sup 3/ b for the resonance integral of / sup 148m/Pm, thereby setting an upper limit of 6,000 b. (auth)
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, NY
- NSA Number:
- NSA-29-006535
- OSTI ID:
- 4377109
- Journal Information:
- Nucl. Sci. Eng., v. 52, no. 3, pp. 310-320, Journal Name: Nucl. Sci. Eng., v. 52, no. 3, pp. 310-320; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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