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 National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7270019
- Report Number(s):
- LA-UR-76-1055; CONF-760560-2; TRN: 76-018611
- Resource Relation:
- Conference: 3. international conference on nuclides far from stability, Corsica, Italy, 19 May 1976
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FERMIUM 257 TARGET
TRITON REACTIONS
FERMIUM 259
SPONTANEOUS FISSION
STRIPPING
BOUNDARY CONDITIONS
CROSS SECTIONS
HALF-LIFE
KINETIC ENERGY
MASS SPECTRA
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
ENERGY
EVEN-ODD NUCLEI
FERMIUM ISOTOPES
FISSION
HEAVY NUCLEI
NUCLEAR REACTIONS
NUCLEI
SPECTRA
TARGETS
TRANSFER REACTIONS
652026* - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)