Spontaneous fission properties of the heavy elements: Bimodal fission

Conference · Fri Nov 11 00:00:00 EST 1988

OSTI ID:6782737

Hulet, E K

We have measured the mass and kinetic-energy distributions from the spontaneous fission of SVYFm, SVYNo, SVZMd, SWMd, SW(104), and SWSNo. All are observed to fission with a symmetrical division of mass, whereas the total-kinetic-energy (TKE) distributions strongly deviated from the Gaussian shape characteristically found in the fission of all other actinides. When the TKE distributions are resolved into two Gaussian's, the constituent peaks lie near 200 and near 233 MeV. We conclude two modes or bimodal fission is occurring in five of the six nuclides studied. Both modes are possible in the same nuclide, but one generally predominates. We also conclude the low-energy but mass-symmetrical mode is likely to extend to far heavier nuclei; while the high-energy mode will be restricted to a smaller region, a region of nuclei defined by the proximity of the fragments to the strong neutron and proton shells in TSSn. 21 refs., 7 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6782737
• Report Number(s): UCRL-99956; CONF-881149-1; ON: DE89005650
• Resource Relation: Conference: 18. international symposium on nuclear physics (ISNP-18) - physics and chemistry of fission devoted to the 50. anniversary of the discovery of nuclear fission, Gaussig, German D.R., 21 Nov 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FISSION FRAGMENTS
KINETIC ENERGY
SPONTANEOUS FISSION
FERMIUM 258
MENDELEVIUM 260
NOBELIUM 258
NOBELIUM 262
NUMERICAL DATA
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
DATA
DECAY
ENERGY
EVEN-EVEN NUCLEI
FERMIUM ISOTOPES
FISSION
HEAVY NUCLEI
INFORMATION
ISOTOPES
MENDELEVIUM ISOTOPES
MICROSEC LIVING RADIOISOTOPES
NOBELIUM ISOTOPES
NUCLEAR DECAY
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
653006* - Nuclear Theory- Spontaneous & Induced Fission