Fragment spin as a function of the mass asymmetry in heavy ion induced fission reactions
- R. K., Choudhury
- A., Saxena
- A., Chatterjee
- D. V., Shetty
- S. S., Kapoor
- M., Cinausero
- L., Corradi
- E., Farnea
- E., Fioretto
- A., Gadea
- D., Napoli
- G., Prete
- A. M., Stefanini
- D., Bazzacco
- S., Beghini
- D., Fabris
- Montagnoli, Giovanna
- G., Nebbia
- C., Rossialvarez
- Scarlassara, Fernando
- C., Ur
- Viesti, Giuseppe
DOIAbstract
The total average spins of fission fragments were measured as a function of fragment mass in 12C, 16O+209Bi and 12C, 16O+232Th reactions at bombarding energies near and above the Coulomb barrier. The mass dependence of the fragment spin for the 12C, 16O+232Th reactions is observed to be in marked contrast to that for the 12C, 16O+209Bi reactions. The present results have been analyzed within the framework of the statistical model taking into account the finite relaxation times for the equilibration of the collective-spin modes. The observed features in 12C, 16O+232Th reactions can be ascribed to incomplete equilibration of the collective-spin modes where the mass relaxation at extreme mass asymmetries terminates before full statistical equi...
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