In Fermi-energy heavy-ion collisions, most hard photons are produced in the first nucleon-nucleon collisions while the nuclei still move collectively, not in the later thermalized matter.
Constraint Molecular Dynamics approach to Fermionic systems
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abstract
We propose a Constraint Molecular Dynamics model for Fermionic system. In this approach the equations of motion of wave packets for the nuclear many-body problem are solved by imposing that the one-body occupation probability $\bar{f}(r,p,t)$ can assume only values less or equal to 1. This condition reflects the Fermionic nature of the studied systems and it is implemented with a fast algorithm which allows also the study of the heaviest colliding system. The parameters of the model have been chosen to reproduce the average binding energy and radii of nuclei in the mass region $A=30\sim 208$. Some comparison to data is given.
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Photon Emission from Nucleon-Nucleon Bremsstrahlung in Fermi-energy Heavy-Ion Collisions
In Fermi-energy heavy-ion collisions, most hard photons are produced in the first nucleon-nucleon collisions while the nuclei still move collectively, not in the later thermalized matter.