Isobaric yield ratios in heavy-ion reactions, and symmetry energy of neutron-rich nuclei at intermediate energies

摘要

The isobaric yield ratios of the fragments produced in the neutron-rich 48Caand 64Ni projectile fragmentation are analyzed in the framework of a modifiedFisher model. The correlations between the isobaric yield ratios (R) and theenergy coefficients in the Weisz\"acker-Beth semiclassical mass formula (thesymmetry-energy term asym, the Coulomb-energy term ac, and the pairing-energyterm ap) and the difference between the chemical potentials of the neutron andproton ({\mu}n-{\mu}p) are investigated. Simple correlations between({\mu}n-{\mu}p)/T, ac/T, asym/T, and ap/T (where T is the temperature), and lnRare obtained. It is suggested that ({\mu}n-{\mu}p)/T, ac/T, asym/T, and ap/T ofneutron-rich nuclei can be extracted using isobaric yield ratios for heavy-ioncollisions at intermediate energies.