EXCITATION FUNCTIONS OF U$sup 235$ AND U$sup 238$ BOMBARDED WITH HELIUM AND DEUTERIUM IONS

Journal Article · Tue Mar 31 23:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys.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.114.163· OSTI ID:4270845

Wing, J; Ramler, W J; Harkness, A L; Huizenga, J R

Cross sections were determined for the reactions U/sup 238/(He/sup 4/ ,)Pu/sup 241/STAincluding U/sup 238/(He/sup 4,p)Np/sup 241/ B/sup -/ yields Pu/sup 241/!, U/sup 238/(He/sup 4/,2n)Pu/sup 240/, U/sup 238/(He/ sup 4/, 3n)Pu/sup 239/, U/sup 238/(He/sup 4, 4n)Pu/sup 238/, U/sup 238/(He/sup 4/ ,fission), U/sup 235/(He/sup 4/,n)Pu/sup 238/, and U/sup 235 /(He/sup 4/,3n)Pus/ up 236/ induced by helium ions of energies from 18.0 to 43.O Mev. The yields of Pu/sup 239/, Pu/sup 240/, and Pu/sup 241/ were determined by a mass spectrometric technique. Cross sections were measured for the reactions U/sup 238/(d,p)U/sup 239/, U/sup 238/(d,2n)Np/sup 238/, U/sup 238/(d,4n)Np/sup 236/(ss hr), U/sup 238/ (d,t; d,p2n) U/sup 237/,U/sup 235/(d,n)Np/sup 236/(22 hr), U/sup 235/(d,2nNp/sup 235, and U/s up 235/(d,3n) Np/sup 235/ induced by deuteuons of energes from 5.8 to 21.5 Mev. The above excitation functions are compared with Similar excitation functions of nonfissile nuclei to show the effect of fissionability on spallation cross sections. Mean values of GAMMA /sub n// GAMMA /sub f/ are derived for several heavy nuclides by fitting the experimental excitation functions with theoretical cross sections calculated from the Jackson model modifiod for fission. In addition to the discussion on thc compound-nucleus formation machanism, some discussion of the experimental evidence for direct interactions is given. (auth)

• Research Organization: Argonne National Lab., Lemont, Ill.
• NSA Number: NSA-13-016474
• OSTI ID: 4270845
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 114; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA PARTICLES
COMPOUND NUCLEI
CROSS SECTIONS
DEUTERON BEAMS
DIRECT REACTIONS
ENERGY RANGE
EXCITATION
FISSION
HALF-LIFE
HELIUM 4
ION BEAMS
IRRADIATION
JACKSON MODEL
MASS SPECTROMETERS
MEASURED VALUES
NEPTUNIUM 234
NEPTUNIUM 235
NEPTUNIUM 238
NEPTUNIUM 241
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICALS
PHYSICS AND MATHEMATICS
PLUTONIUM 236
PLUTONIUM 238
PLUTONIUM 239
PLUTONIUM 240
PLUTONIUM 241
PROTONS
SPALLATION
TRITONS
URANIUM 235
URANIUM 238