Photonuclear yields of the /sup 237/Pu fission isomers

Journal Article · Thu Feb 01 04:00:00 EST 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.19.433· OSTI ID:6320637

Guenther, W; Huber, K; Kneissl, U; Krieger, H; Maier, H J

The half-lives and yield ratios Y/sub iso//Y/sub prompt/ for the two /sup 237/Pu fission isomers have been investigated in the photonuclear reaction /sup 239/Pu(..gamma..,2n). The observed half-lives (t/sub 1/2/ = 77 +- 16 ns, 1050 +- 400 ns) agree well with the data from particle-induced fission. The measured yield ratios were (Y/sub iso//Y/sub prompt/)/sup short//sub f/ = (6.4 +- 1.7) x 10/sup -6/ and (Y/sub iso// Y/sub prompt/)/sup long//sub f/ = (0.83 +- 0.22) x 10/sup -6/. From a statistical model analysis of the isomeric fission yield ratio (Y/sub short//Y/sub long/ = 7.7 +- 2.9) a spin assignment of the two shape isomers was attempted. The analysis provided in the context of the statistical model, the most probably spin values I = 11/2 for the excited, long-lived state and I = 5/2 for the short-lived ground state in the second minimum of /sup 237/Pu. Comparing these spin values with single-particle calculations, we tend to classify the excited state as the (615)/sub 11/2+/ Nilsson orbit and the short lived state as the (862)/sub 5/2+/ state.

• Research Organization: Universitaet, 6300 Giessen, West Germany
• OSTI ID: 6320637
• 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

652023* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Energy Levels & Transitions-- (-1987)
652026 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BREMSSTRAHLUNG
CROSS SECTIONS
DATA
DATA FORMS
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FISSION
FISSION BARRIER
FISSION ISOMERS
FISSION YIELD
GAMMA SPECTRA
HALF-LIFE
HEAVY NUCLEI
HIGH SPIN STATES
INFORMATION
INTERNAL CONVERSION RADIOISOTOPES
ISOLATED VALUES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
NEUTRON SPECTRA
NUCLEAR POTENTIAL
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PARTICLE PROPERTIES
PHOTOFISSION
PHOTONUCLEAR REACTIONS
PLUTONIUM 237
PLUTONIUM 239 TARGET
PLUTONIUM ISOTOPES
POTENTIALS
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELECTION RULES
SINGLE-PARTICLE MODEL
SPECTRA
SPIN
STATISTICAL MODELS
TARGETS
YIELDS