Giant multipole resonances in the deformed fissionable nucleus /sup 238/U
The deformed, fissionable nucleus /sup 238/U was studied with inelastic scattering of 87.5 MeV electrons between 5 and 40 MeV excitation energy with inelastic momentum transfers ranging from 0.32 fm/sup -1/ to 0.58 fm/sup -1/ for an excitation energy of 15 MeV. Resonance cross sections extracted were compared with distorted-wave Born-approximation calculations using the Goldhaber-Teller, Steinwedel-Jensen, and Myers-Swiatecki models of the giant resonance. It is demonstrated that up to the first minimum of the form factor the cross section is nearly completely determined by one parameter, the transition radius R/sub tr/. Using the known systematics of various multipole resonances in other, nonfissionable nuclei as a guide, it was found that the assumed ground state radius of /sup 238/U had to be enlarged by about 10% for all multipolarities, to bring the strength found into agreement with the systematics and with other experiments in /sup 238/U. In particular, while the model-independent values for position and width of the giant dipole resonance agree well with photon experiments, a scaled version of the Myers-Swiatecki model had to be used to produce agreement in strength. Similarly a scaled Goldhaber-Teller model was used for the isoscalar E2 resonance at 9.9 MeV. The situation for the isovector states above the giant dipole resonance, E2, and E3 (or E0) is even more complicated. It is argued that with proper caution and consideration of other available data the use of the collective models mentioned above may give valuable insight into the charge distribution of /sup 238/U at higher excitation energies.
- Research Organization:
- Department of Physics and Chemistry, Naval Postgraduate School, Monterey, California 93940
- OSTI ID:
- 5727139
- Journal Information:
- Phys. Rev., C; (United States), Vol. 21:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON REACTIONS
FISSION
INELASTIC SCATTERING
URANIUM 238
GIANT RESONANCE
URANIUM 238 TARGET
CHARGE DISTRIBUTION
DEFORMED NUCLEI
DIPOLE MOMENTS
DWBA
E2-TRANSITIONS
E3-TRANSITIONS
HYDRODYNAMIC MODEL
MEV RANGE 10-100
TOTAL CROSS SECTIONS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
LEPTON REACTIONS
MATHEMATICAL MODELS
MEV RANGE
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
PARTICLE MODELS
RADIOISOTOPES
RESONANCE
SCATTERING
STATISTICAL MODELS
TARGETS
THERMODYNAMIC MODEL
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
652023* - Nuclear Properties & Reactions
A=220 & above
Experimental- Energy Levels & Transitions- (-1987)
652025 - Nuclear Properties & Reactions
A=220 & above
Experimental- Nuclear Reactions & Scattering- (-1987)
652026 - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)