Effect of nucleon exchange on projectile multifragmentation in the reactions of Si-28+Sn-112 and Sn-124 at 30 and 50 MeV/nucleon - art. no. 064613

The multifragmentation of quasiprojectiles was studied in the reactions of a Si-28 beam with Sn-112 and Sn-124 targets at projectile energies of 30 an d 50 MeV/nucleon. The quasiprojectile observables were reconstructed using isotopically identified charged particles with Z(f)less than or equal to5 d etected at forward angles. The nucleon exchange between projectile and targ et was investigated using the isospin and the excitation energy of the reco nstructed quasiprojectile. For events with total reconstructed charge equal to the charge of the beam (Z(tot) = 14), the influence of the beam energy and target isospin on the neutron transfer was studied in detail. Simulatio ns were carried out employing a model of deep inelastic transfer, a statist ical model of multifragmentation, and a software replica of the FAUST detec tor array. The concept of deep inelastic transfer provides a good descripti on of the production of highly excited quasiprojectiles. The isospin and ex citation energy of the quasiprojectile were described with good overall agr eement. The fragment multiplicity, charge and isospin were reproduced satis factorily. The range of contributing impact parameters was determined using a backtracing procedure.