Two-fragment correlation functions for quasiprojectile source and midrapidity component at intermediate energies
Abstract
Two-fragment reduced-velocity correlation functions of intermediate-mass fragments emitted from midrapidity component and quasiprojectile (QP) sources formed in 58Ni+12C and 58Ni+197Au reactions at 34.5 MeV/nucleon have been studied. For the midrapidity component, they show a stronger Coulomb suppression at low relative velocities than for the QP source, suggesting a shorter emission time for it than for the QP source. Comparing the experimental correlation functions with the prediction of many-body Coulomb trajectory code, the emission times of a QP source formed in both reactions were extracted as a function of the excitation energy. The variation of emission time of the QP source with the excitation energy is independent of the reaction system. It decreases monotonically with the excitation energy in the range of (2-6)A MeV from several hundred fm/c to about 100 fm/c. Above an excitation energy of 6A MeV, it becomes very short and saturates, suggesting that the QP source undergoes a multifragmentationlike breakup. The influence of the quasitarget fragment Coulomb interaction on QP emission time is also considered.
- Publication:
-
Physical Review C
- Pub Date:
- December 2001
- DOI:
- 10.1103/PhysRevC.65.014606
- Bibcode:
- 2001PhRvC..65a4606H
- Keywords:
-
- 25.70.Pq;
- Multifragment emission and correlations