PHOTONEUTRON THRESHOLDS FOR IRON, GERMANIUM, RUBIDIUM, AND HAFNIUM

Journal Article · Sun Jun 15 04:00:00 EDT 1958 · Physical Review (U.S.) Superseded in part by Phys.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.110.1388· OSTI ID:4330748

Tobin, R; McElhinney, J; Cohen, L

Photoneutron thresholds for Fe/sup 56/, Fe/sup 57/, Ge/sup 7/, Rb/sup 85/ , Rb/sup 87/, Hf/sup 177/, and Hf/sup 179/ have been measured by using bremsstrahlung from a 22-Mev betatron as a photon source. The photon-induced reactions were observed by neutron detection supplemented in one case by radioactivity determinations. A comparison of these thresholds with neutron binding energies revealed that, for some oi the nuclei, better agreement was obtained if formation of the residual nucleus in an excited state instead of in the ground state was assumed. The neutron binding energies inferred from these measurements are: 11.34 plus or minus 0.10 Mev for Fe/sup 56/; 7.85 plus or minus 0.13 Mev for Fe/sup 57/; 6.50 plus or minus 0.16 Mev for Ge/sup 73/; 10.50 plus or minus 0.08 Mev for Rb/sup 85/; 9.89 plus or minus 0.05 Mev for Rb/sup 87/; 6.70 plus or minus 0.09 Mev for Hf/sup 177/; and 6.52 plus or minus 0.12 for Hf/sup 179/. (auth)

• Research Organization: U.S. Naval Research Lab., Washington
• NSA Number: NSA-12-014281
• OSTI ID: 4330748
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 110; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETATRONS
BINDING ENERGY
BREMSSTRAHLUNG
ENERGY LEVELS
ENERGY RANGE
EXCITATION
GERMANIUM 73
HAFNIUM 177
HAFNIUM 179
IRON 56
IRON 57
MEASURED VALUES
NEUTRON DETECTION
NUCLEAR REACTIONS
NUCLEI
PHOTONEUTRONS
PHOTONS
PHYSICS
RADIOACTIVITY
RUBIDIUM 85
RUBIDIUM 87