Electromagnetic dissociation of sup 238 U in heavy-ion collisions at 120 MeV/A
The heavy-ion induced electromagnetic dissociation (EMD) of a 120 MeV/A {sup 238}U beam incident on five targets ({sup 9}Be, {sup 27}Al, {sup nat}Cu, {sup nat}Ag, and {sup nat}U) has been studied experimentally. Electromagnetic dissociation at this beam energy is essentially a two step process involving the excitation of a giant resonance followed by particle decay. At 120 MeV/A there is predicted to be a significant contribution ({approximately} 25%) of the giant quadrupole resonance to the EMD cross sections. The specific exit channel which was looked at was projectile fission. The two fission fragments were detected in coincidence by an array of solid-state {Delta}E-E detectors, allowing the charges of the fragments to be determined to within {plus minus} .5 units. The events were sorted on the basis of the sums of the fragments' charges, acceptance corrections were applied, and total cross sections for the most peripheral events (i.e. those leading to charge sums of approximately 92) were determined. Electromagnetic fission at the beam energy of this experiment always leads to a true charge sum of 92. The experimentally observed cross sections are due to nuclear interaction processes as well as electromagnetic processes. Under the conditions of this experiment, the cross sections for the beryllium target are almost entirely due to nuclear processes. The nuclear cross sections for the other four targets were determined by extrapolation from the beryllium data using a geometrical scaling model. After subtraction of the nuclear cross sections, the resulting electromagnetic cross sections are compared to theoretical calculations based on the equivalent photon approximation.
- Research Organization:
- California Univ., Berkeley, CA (United States)
- OSTI ID:
- 5190291
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Electromagnetic dissociation of sup 238 U in heavy-ion collisions at 120 MeV/A
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Related Subjects
ALUMINIUM 27 TARGET
URANIUM 238 REACTIONS
BERYLLIUM 9 TARGET
COPPER
NATURAL URANIUM
SILVER
FISSION
NUCLEAR REACTION KINETICS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC INTERACTIONS
FISSION FRAGMENTS
GIANT RESONANCE
MEV RANGE 100-1000
PARTICLE DECAY
TOTAL CROSS SECTIONS
ACTINIDES
BASIC INTERACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DECAY
ELEMENTS
ENERGY RANGE
EVALUATION
HEAVY ION REACTIONS
INTERACTIONS
KINETICS
METALS
MEV RANGE
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
REACTION KINETICS
RESONANCE
TARGETS
TRANSITION ELEMENTS
URANIUM
663470* - Fission- (1992-)
663520 - Nuclear Mass Ranges- A=6-19- (1992-)
663530 - Nuclear Mass Ranges- A=20-38- (1992-)
663590 - Nuclear Mass Ranges- A=220 & Above- (1992-)
663560 - Nuclear Mass Ranges- A=90-149- (1992-)
663550 - Nuclear Mass Ranges- A=59-89- (1992-)