RADIATIVE CAPTURE CROSS SECTIONS FOR FAST NEUTRONS

Journal Article · Sat Oct 15 04:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys.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.120.556· OSTI ID:4110869

Diven, B C; Terrell, J; Hemmendinger, A

Neutron-capture cross sections were measured for 28 elements at neutron energies of 175 to 1000 kev. The method used was detection of capture gamma radiation in a 1-mdiameter liquid scintillator, the capture samples being placed at the center for irradiation by a pulsed neutron beam. Absolute cross sections were determined by comparison with the known rapture-plus-fission cross section of U/sup 235/; both capture and fission events are detected with nearly 100% efficiency in this arrangement. Corrections were made for loss of capture- gamma -ray energy, by means of pulse-height analyses and comparison between 1-m and 48cm scintillator results; corrections were made for change in path length due to scattering. The results obtained appear to agree reasonably well with the predictions of resonance theory, with level densities given by the Fermi gas model together with the effective ground state of Hurwitz and Bethe. The low capture cross sections of magicnumber target nuclides appear well correlated with the magic-number effects on the mass. (auth)

• Research Organization: Los Alamos Scientific Lab., N. Mex.
• NSA Number: NSA-15-003444
• OSTI ID: 4110869
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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

Related Subjects

CAPTURE
CONFIGURATION
CROSS SECTIONS
DETECTION
ELEMENTS
ENERGY
ENERGY LEVELS
FAST NEUTRONS
FERMI GAS
FERMI GAS MODEL
GAMMA RADIATION
HURWITZ EFFECT
LIQUIDS
MASS
MEASURED VALUES
NEUTRON BEAMS
NUCLEAR MODELS
PHYSICS
PULSES
RESONANCE
SCATTERING
SCINTILLATION COUNTERS
TARGETS
URANIUM 235