Isotopic composition of fragments in multifragmentation of very large nuclear systems: effects of the chemical equilibrium

Abstract

Studies on the isospin of fragments resulting from the disassembly of highly excited large thermal-like nuclear emitting sources, formed in the ^{197}Au + ^{197}Au reaction at 35 MeV/nucleon beam energy, are presented. Two different decay systems (the quasiprojectile formed in midperipheral reactions and the unique source coming from the incomplete fusion of projectile and target in the most central collisions) were considered; these emitting sources have the same initial N/Z ratio and excitation energy (E^* ~= 5--6 MeV/nucleon), but different size. Their charge yields and isotopic content of the fragments show different distributions. It is observed that the neutron content of intermediate mass fragments increases with the size of the source. These evidences are consistent with chemical equilibrium reached in the systems. This fact is confirmed by the analysis with the statistical multifragmentation model.

9 pages, 4 ps figures

References in corpus (1)

• Fragment Isotope Distributions and the Isospin Dependent Equation of State

Cited by in corpus (5)

• Suppression of Charge Equilibration leading to the Synthesis of Exotic Nuclei
• Critical behaviors in central and peripheral collisions: a comparative analysis
• Comparison of mid-velocity fragment formation with projectile-like decay
• Improvement on Fermionic properties and new isotope production in molecular dynamics simulations
• Multiplicity Distributions of Intermediate Mass Fragments in the Thermodynamic Model