Product yields for the photofission of /sup 238/U with 12-, 15-, 20-, 30-, and 70-MeV bremsstrahlung

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

DOI:https://doi.org/10.1103/PhysRevC.19.422· OSTI ID:6457352

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

Cumulative yields for about 40 mass chains and fractional independent yields of /sup 128/Sn, /sup 128/Sb/sup g/, /sup 131/Te/sup g/, /sup 131/Te/sup m/, /sup 132/I/sup g/, /sup 132/I/sup m/, /sup 134/I, /sup 134/Cs, /sup 135/Xe, and /sup 136/Cs were determined for the photofission of /sup 238/U with 12-, 15-, 20-, 30-, and 70-MeV bremsstrahlung. Changes in the characteristics of the mass distribution are studied. An enhanced yield in the mass region 133-134, decreasing with increasing end-point energy of the bremsstrahlung (E/sub e/), is observed. From the determined independent yields the most probable charges Z/sub p/(E/sub e/) are calculated using the value 0.85 for the width parameter c of the charge distribution as deduced from our results for mass chain 134. The determined Z/sub p/(E/sub e/) values are very well described by the empirical relation of Nethaway except for the mass chain 136. This discrepancy for mass chain 136, which decreases with increasing end-point energy of the bremsstrahlung, is attributed to an abnormal low yield of /sup 136/Cs. Fragment shell effects are discussed. From the isomeric ratios for /sup 131/Te/sup g/-/sup 131/Te/sup m/ and /sup 132/I/sup g/-/sup 132/I/sup m/ average initial fragment spins are calculated using a statistical model analysis.

• Research Organization: Nuclear Physics Laboratory, Proeftuinstraat 86, B-9000 Gent, Belgium
• OSTI ID: 6457352
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 19:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ANGULAR MOMENTUM
ANTIMONY 128
ANTIMONY ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BREMSSTRAHLUNG
CESIUM 134
CESIUM 136
CESIUM ISOTOPES
CHARGE DISTRIBUTION
DATA
DATA FORMS
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FISSION
FISSION FRAGMENTS
FISSION YIELD
GAMMA SPECTRA
GRAPHS
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE 132
IODINE 134
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MASS SPECTRA
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PARTICLE PROPERTIES
PHOTOFISSION
PHOTONUCLEAR REACTIONS
RADIATIONS
RADIOISOTOPES
SHELL MODELS
SPECTRA
SPIN
STATISTICAL MODELS
TARGETS
TELLURIUM 131
TELLURIUM ISOTOPES
TIN 128
TIN ISOTOPES
URANIUM 238 TARGET
XENON 135
XENON ISOTOPES
YEARS LIVING RADIOISOTOPES
YIELDS