Heavy Residue Isoscaling as a Probe of the Process of N/Z Equilibration

Details Heavy Residue Isoscaling as a Probe of the Process of N/Z Equilibration Heavy Residue Isoscaling as a Probe of the Process of N/Z Equilibration

2003-05-23

arxiv.org/abs/nucl-ex/0305027v2

Phys.Lett. B588 (2004) 35-42

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 4 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2004.03.027

The isotopic and isobaric scaling behavior of the yield ratios of heavy projectile residues from the collisions of 25 MeV/nucleon 86Kr projectiles on 124Sn and 112Sn targets is investigated and shown to provide information on the process of N/Z equilibration occurring between the projectile and the target. The logarithmic slopes $\alpha$ and $\beta^{'}$ of the residue yield ratios with respect to residue neutron number N and neutron excess N--Z are obtained as a function of the atomic number Z and mass number A, respectively, whereas excitation energies are deduced from velocities. The relation of the isoscaling parameters $\alpha$ and $\beta^{'}$ with the N/Z of the primary (excited) projectile fragments is employed to gain access to the degree of N/Z equilibration prior to fragmentation as a function of excitation energy. A monotonic relation between the N/Z difference of fragmenting quasiprojectiles and their excitation energy is obtained indicating that N/Z equilibrium is approached at the highest observed excitation energies. Simulations with a deep-inelastic transfer model are in overall agreement with the isoscaling conclusions. The present residue isoscaling approach to N/Z equilibration offers an attractive tool of isospin and reaction dynamics studies in collisions involving beams of stable or rare isotopes.

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