Discovery of fermium-259. [Half life, cross sections]
A 1.5-sec spontaneous fission activity was produced by irradiation of /sup 257/Fm with 16-MeV tritons at the Los Alamos Tandem Van de Graaff Facility. On the basis of cross section and fission systematics, this 1.5-sec activity was attributed to /sup 259/Fm formed by the reaction, /sup 257/Fm(t,p)/sup 259/Fm. /sup 259/Fm is the heaviest known isotope of fermium and has more neutrons than any other isotope so far identified. The mass distribution of the /sup 259/Fm is highly symmetric and the average total kinetic energy is very high, 230 +- 2 MeV. These features continue the trend toward more symmetric mass distributions and higher total kinetic energies observed previously for the fermium isotopes as the number of neutrons is increased.
- Research Organization:
- Los Alamos Scientific Lab., N.Mex. (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7270019
- Report Number(s):
- LA-UR-76-1055; CONF-760560-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
BOUNDARY CONDITIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
ENERGY
EVEN-ODD NUCLEI
FERMIUM 257 TARGET
FERMIUM 259
FERMIUM ISOTOPES
FISSION
HALF-LIFE
HEAVY NUCLEI
KINETIC ENERGY
MASS SPECTRA
NUCLEAR REACTIONS
NUCLEI
SPECTRA
SPONTANEOUS FISSION
STRIPPING
TARGETS
TRANSFER REACTIONS
TRITON REACTIONS