PHOTONEUTRON REACTIONS: C$sup 12$, N$sup 14$, O$sup 16$, AND F$sup 19$ NEAR THRESHOLD

Journal Article · Fri Jul 15 04:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.119.716· OSTI ID:4158860

Geller, K N; Halpern, J; Muirhead, E G

Photoneutron reactions in carbon, nitrogen, oxygen, and fluorine were studied in the region of threshold using improved efficiency for the detection of the residual activity. The betatron energy calibration used is based on thresholds of deuterium, bismuth, copper, and for scattering from the 15.12-Mev level in carbon. Results show that the thresholds for nitrogen and fluorine. correspond well with the expected values for the respective neutron separation energies. For oxygen, the position of threshold is also in good agreement. Assuming a linear extrapolation of the betatron calibration above 15 Mev, it is found that the carbcn threshold is 52 kev above the accepted value of the separation energy. The successful correlation between the assignraent of known resonance energies with the positions of many of the breaks in the yield curves corroborates the assumed linearity of the betatron energy scale above 15 Mev. It follows that previous betatron calibrations using the carbon threshold must be in error by approximately 100 kev at 18.7 Mev. (auth)

• Research Organization: Univ. of Pennsylvania, Philadelphia
• NSA Number: NSA-14-022402
• OSTI ID: 4158860
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 119; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETATRONS
BINDING ENERGY
BISMUTH
CARBON
CARBON 12
COPPER
DETECTION
DEUTERIUM
EFFICIENCY
ENERGY
ENERGY LEVELS
ENERGY RANGE
ERRORS
FLUORINE 19
MEASURED VALUES
NITROGEN 14
NUCLEAR REACTIONS
OXYGEN 16
PHOTONEUTRONS
PHYSICS
RESONANCE
SCATTERING
STANDARDS
THRESHOLD ENERGY