Product yields for the photofission of /sup 235/U with 12-, 15-, 20-, 30-, and 70-MeV bremsstrahlung

Journal Article · Mon Dec 31 23:00:00 EST 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.237· OSTI ID:5633202

Jacobs, E; Thierens, H; De Frenne, D; De Clercq, A; D'hondt, P; De Gelder, P; Deruytter, A J

The mass distributions for the photofission of /sup 235/U using bremsstrahlung with end-point energy of 12, 15, 20, 30, and 70 MeV were determined by ..gamma.. spectrometry of fission product catcher foils. Smoothly varying curves without fine structure were obtained. A third hump in the symmetric region is not present. Several fractional independent chain yields in the mass region 126 --140 were measured and the corresponding most probable charges Z/sub p/(E/sub e/) were deduced. A comparison with the charge expected from the unchanged charge density hypothesis is made and an influence of the 50-proton shell on the behavior of the Z/sub p/ function is observed. Except in this mass region the determined Z/sub p/(E/sub e/) values are very well described by the empirical relation of Nethaway. From the isomeric ratios of /sup 126/Sb/sup g/-/sup 126/Sb/sup m/, /sup 128/Sb/sup g/-/sup 128/Sb/sup m/, and /sup 131/Te/sup g/-/sup 131/Te/sup m/ average initial fragment spins are calculated using a statistical model analysis. The values increase with increasing end-point energy of the bremsstrahlung.

• Research Organization: Nuclear Physics Laboratory, Proeftuinstraat 86, B-9000 Gent, Belgium
• OSTI ID: 5633202
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652024 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Moments & Spin-- (-1987)
652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ANGULAR MOMENTUM
ANTIMONY ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BREMSSTRAHLUNG
CESIUM 136
CESIUM ISOTOPES
CHARGE DENSITY
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FISSION
FISSION PRODUCTS
GAMMA SPECTROMETERS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE 134
IODINE ISOTOPES
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LANTHANUM 140
LANTHANUM ISOTOPES
MASS SPECTRA
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
PARTICLE PROPERTIES
PHOTOFISSION
PHOTONUCLEAR REACTIONS
RADIATIONS
RADIOACTIVE MATERIALS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SHELL MODELS
SPECTRA
SPECTROMETERS
SPIN
STATISTICAL MODELS
TARGETS
TELLURIUM 131
TELLURIUM ISOTOPES
TIN 128
TIN ISOTOPES
URANIUM 235 TARGET
XENON 135
XENON ISOTOPES