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Low-energy fission systematics of the fermium isotopes: the transition from mass asymmetry at fermium-254 to symmetry at fermium-259. [Mass division, total kinetic energy release]

Conference ·
OSTI ID:7175147

Recent measurements have shown that /sup 259/Fm gives the highest total kinetic energy release and the most symmetric mass division so far observed for spontaneous fission. These results continue the trends observed previously in the fermium isotopes toward higher total kinetic energies and more symmetric mass division with increasing mass of the fermium isotopes. The transition from asymmetric mass division (/sup 254/Fm) to highly favored symmetric mass division (/sup 259/Fm) now appears to have been completed. These features are consistent with the simple postulate that the more neutron-rich fermium isotopes show an increase in the yield of symmetric fragments and in the total kinetic energy because symmetric mass division of fermium (Z = 100) nuclei results in two fragments which have the magic proton number of 50 and are close to the magic neutron number of 82. The proximity of the fragments to the doubly magic configuration seems to have a profound effect on the mass division and total kinetic energy release in fission.

Research Organization:
Los Alamos Scientific Lab., N.Mex. (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
7175147
Report Number(s):
LA-UR-76-1151; CONF-760560-4
Country of Publication:
United States
Language:
English

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Related Subjects

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
ASYMMETRY
BARYON REACTIONS
ENERGY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIUM 254
FERMIUM 256
FERMIUM 257
FERMIUM 259
FERMIUM ISOTOPES
FISSION
HADRON REACTIONS
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
ISOTOPES
KINETIC ENERGY
MAGIC NUCLEI
MASS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
RADIOISOTOPES
SPONTANEOUS FISSION
SYMMETRY
THERMAL FISSION