Independent isomeric yield ratios and primary angular momenta in the photofission of /sup 235,238/U with 12--30-MeV bremsstrahlung

Journal Article · Tue May 01 00:00:00 EDT 1984 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.29.1777· OSTI ID:6758370

De Frenne, D; Proot, B; Thierens, H; De Gelder, P; Jacobs, E; De Clercq, A

The independent isomeric yield ratios for /sup 129/Sn, /sup 130/Sb, /sup 131/Sn, /sup 132/Sb, /sup 133/Te, and /sup 136/I for the photofission of /sup 235/U with 12--30-MeV bremsstrahlung and for /sup 126/Sb, /sup 129/Sn, /sup 130/Sb, /sup 131/Sn, /sup 132/Sb, /sup 133/Te, and /sup 136/I for the photofission of /sup 238/U have been determined using radiochemical techniques and gamma spectrometry of fission product catcher foils and irradiated uranium samples. The root-mean-square values of the primary angular momenta of the corresponding fission fragments, J/sub rms/, were calculated with the statistical procedure of Huizenga and Vandenbosch and with the more elaborate deexcitation model of Min and Martinot. Both procedures gave, except for /sup 130/Sb, almost the same J/sub rms/ values. Our experimental results show a near independency of J/sub rms/ on the spin and excitation energy of the compound nucleus. An increase of the J/sub rms/ values with the excitation energy of the fragments is observed. In addition, a significant proton odd-even effect on the J/sub rms/ values is present for the photofission of /sup 235/U as well as /sup 238/U. Our experimental photofission results show a qualitative agreement with the theoretical calculations of Dietrich and Zielinska-Pfabe.

• Research Organization: Laboratorium voor Kernfysica, B-9000 Ghent, Belgium
• OSTI ID: 6758370
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 29:5; 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
ANGULAR MOMENTUM
ANTIMONY 126
ANTIMONY 130
ANTIMONY 132
ANTIMONY ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BREMSSTRAHLUNG
CHEMICAL ANALYSIS
DATA
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FISSION
FISSION YIELD
GAMMA SPECTROMETERS
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
IODINE 136
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PHOTOFISSION
PHOTONUCLEAR REACTIONS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
RADIOCHEMICAL ANALYSIS
RADIOISOTOPES
SPECTROMETERS
TARGETS
TELLURIUM 133
TELLURIUM ISOTOPES
TIN 129
TIN 130
TIN 131
TIN ISOTOPES
URANIUM 235 TARGET
URANIUM 238 TARGET
YIELDS