Isospin dependence of isobaric ratio Y((3)(H))/Y(He-3) and its relation totemperature

A dependence of the isobaric ratio Y(H-3)/Y(He-3) on the N/Z ratio of the r econstructed quasiprojectile for the reaction of Si-28 beam with Sn-112,Sn- 124 targets at two different projectile energies of 30 and 50 MeV/nucleon i s presented. We demonstrate a linear dependence of the observable ln(Y(H-3) /Y(He-3)) on the N/Z ratio of the quasiprojectile and show the dependence o f the slope on the reconstructed excitation energy of the quasiprojectile. We relate this slope dependence at a given excitation energy to the tempera ture of the fragmenting system. Using the model assumptions of the statisti cal multifragmentation model, a method of temperature determination is prop osed. A caloric curve is constructed and compared to the result of the doub le isotope ratio method for the same set of the data and to the results of other studies. (C) 2001 Elsevier Science B.V. All rights reserved.