NEUTRON-INDUCED FISSION CROSS SECTION OF Np$sup 23$$sup 7$

Journal Article · Tue Dec 15 04:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys.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.116.1575· OSTI ID:4208675

Schmitt, H W; Murray, R B

The neutron-induced fission cross section of Np/sup 237/ was measured as a function of neutron energy in the range 0.9 to 8.0 Mev. Measurements above 1.7 Mev were made relative to the fission cross section of U/sup 238/ using 2 pi / sup -/ counting of fission fragmnents from thin fissile deposits placed back to back in a gridded ionization chamber. In the range 0.9 to 2.8 Mev the energy dependence of the Np/sup 237/ fission cross section was determined relative to the T(p,n)He/sup 3/ yield, and the results were normalized to those of the comparison counting experiment in the overlapping energy range. Results show that the cross sectlon Increases above threshold to a maximum value of 1.75 barns at -2 Mev, decreases to 1.40 barns at approximately 5 Mev, and increases again to 2.14 barns at 8 Mev. Estimated uncertainty in the absolute magnitude of sigma f(Np) is plus or minus 7%. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-14-010081
• OSTI ID: 4208675
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 116; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CROSS SECTIONS
ENERGY
ENERGY RANGE
ERRORS
FISSION
FISSION PRODUCTS
HELIUM
HELIUM 3
IONIZATION CHAMBERS
MEASURED VALUES
NEPTUNIUM 237
NEUTRONS
PHYSICS
PROTON BEAMS
STANDARDS
TRITIUM
URANIUM 238