Excitation energy at scission in thermal-neutron-induced fission

Journal Article · Mon Feb 01 00:00:00 EST 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.918· OSTI ID:5562210

Mantzouranis, G; Nix, J R

For the thermal-neutron-induced fission of /sup 235/U and /sup 233/U, we extract the internal excitation energy at the scission point by use of two different methods. The first method uses experimental data for /sup 235/U+n/sub th/ on the neutrons and gamma rays emitted from doubly magic fission fragments, where the extra stability associated with shell closures makes the deformation energy small. Under the assumption that both fragments have equal temperatures, this yields an upper limit of 9.9 MeV for the total internal excitation energy at scission. The second method uses experimental data for /sup 233/U+n/sub th/ on odd-even effects in fission-fragment mass distributions and yields an average value of 5.6 MeV for the total internal excitation energy at scission when integrated over all fission-fragment kinetic energies. In both cases the internal excitation energy at scission is significantly smaller than that predicted by the one-body-dissipation theory of Swiatecki and co-workers and is instead much closer to that predicted by ordinary two-body viscosity.

• Research Organization: Max-Planck-Institut fuer Kernphysik, D-6900 Heidelberg, Federal Republic of Germany
• OSTI ID: 5562210
• Journal Information: Phys. Rev. C; (United States), Vol. 25:2
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
URANIUM 233
THERMAL FISSION
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GAMMA RADIATION
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NEUTRONS
SHELL MODELS
TEMPERATURE DEPENDENCE
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
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FERMIONS
FISSION
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HEAVY NUCLEI
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ISOMERIC TRANSITION ISOTOPES
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MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
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652026* - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)