COMPARISON OF Po$sup 210$ ALPHA-PARTICLE ENERGY WITH THE Li$sup 7$(p,n)Be$sup 7$ REACTION THRESHOLD ENERGY
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Recent absolute measurements of the Po/sup 210/ alpha -particle energy disagree with the older value used as the standard for many nuclear reaction energy measurements. A new comparison with the Li(p,n)Be/sup 7/ reaction threshold energy was made using the Notre Dame electrostatic accelaretor and broad-range spectrograph. Four separate methods of comparison were used. In the first three the threshold was run and then protons or deuterons were scattered from appropriate targets so that the scattered group was recorded on the spectrograph plate near the alpha group from a source placed at the target position. First, the spectrograph and, second, the beam analyzer were used to compare particle momenta. Third, with both fields held constant after the threshold was run with the molecular beam, deuterons were scattered, giving particles of the same B? as the alpha 's. In the fourth method several reaction energies that are precisely known in terms of the Li/sup 7/(p,n)Be/sup 7/ reaction threshold energy were measured in terms of the Po/sup 210/ alpha - particle energy. These were the Mg/sup 24/(d,d')Mg/sup 24*/ reaction to the first excited state of Mg/sup 24/ and the N/sup 14/(d,p)N/sup l5/ reaction leading to three excited states of N/sup 15/. The four measurements agree and give 5.3086 plus or minus 0.003 Mev for Po/sup 210/ alpha -particle energy based on 1.8811 Mev for the Li/sup 7/(p n)Be/sup 7/ reaction threshold energy. (auth)
- Research Organization:
- Univ. of Notre Dame, Ind.
- NSA Number:
- NSA-15-003452
- OSTI ID:
- 4110831
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 120; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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