MOMENTUM TRANSFER IN HEAVY-ION-INDUCED REACTIONS
Technical Report
·
OSTI ID:4707318
A three-dimensional fragment-fragment angularcorrelation method is used to study reactions that take place between Ho/sup 165/, Au/sup 197/, and U/sup 238/ and various ions of 10.4 Mev/nucleon. For ions such as C/sup 12/ O/sup 16/ and Ne/sup 20/ impinging on U/sup 238/, two peaks are observed in the correlation function. The larger and narrower one corresponds to a complete amalgamati on of the ion with the target nucleus. For lighter targets, only tuls peak is observed. The vertical and horizontal spreads of this peak are correlated to neutron evaporation and to the fragment's mass and momentum spreads. The average number of neutrons emitted and their kineti c energy, 2T, are deduced from the experimental data. For all the system, 2T was found to be between 4.0 and 4.6 Mev. The method does not allow one to say if the neutrons are emitted from the fragments or the fissioning nucleus. For the system He/sup 4/ + U/sup 238/, the neutrons are found to be emitted isotropically to within 4%. In analyzing the second peak, it is found that the fissioning nucleus has a momentum at an angle to the momentum of the ion. Values for the average momenta and angles of the fissioning nucleus and the stripped ion are obtained. The ion revolves with the nucleus for about 15 deg, during which approximately four nucleons are transferred. The cross section for these types of surface reactions is around 25% of the total fission cross section for C/sup 12/, 30% for O/sup 16/ , and 40% for Ne/sup 20/. Surface reactions are also observed at lower bombarding energies. The stripped ion is emitted at increasing angies as the veiocity of the ion decreases. This results in a relative increase in the forward momentum, that is approaching that of the heavy ion, thereby complicating analysis of the data. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-17-025868
- OSTI ID:
- 4707318
- Report Number(s):
- UCRL-10748
- Country of Publication:
- United States
- Language:
- English
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