Nucleon transfer in highly mass-asymmetric reaction systems between197au and relatively light projectiles in the energy region below 10 MeV/u

Abstract

Mechanisms of heavy-ion induced nuclear reactions in mass-asymmetric systems were studied by focusing on the nucleon transfer reaction. Excitation functions and projected mean recoil ranges for the target-like products in 37C1-, 160-, 14N-, and lzC-induced reactions on ~97Au were measured by means of 7-ray spectrometry. The energy range studied was near the Coulomb barrier of the systems with incident energies below 10 MeV/u. Nucleon transfer reactions were discussed by distinguishing the products from quasi-elastic transfer (QET) and those from deep inelastic transfer (DIT). The tendency towards equilibration of the N/Z value and the energy damping, which are the characteristic features of DIT, were found in the production of Au isotopes. Observations are consistent with the generally accepted concept that QET takes place along a trajectory near the Coulomb trajectory. QET was made to be connected with the interaction radius and most of the cross section ratios were reproduced well by an extended tunneling model.

Beam energy dependence of cross sections of projectile like fragments in19F+89Y reaction

“…Data of the monitor detector were used to determine the absolute cross sections for different transfer channels assuming the scattering at 20 • to be purely Columbic. Peaks due to the elastic scattering of 19 F and 7 Li beams were used for the energy calibration of the telescopes.…”

“…Reactions involving one or two nucleon transfer are termed as quasi-elastic transfer (QET) reactions and those involving large mass transfer are termed as massive transfer reactions or incomplete fusion (ICF) reactions. Measurement of kinetic energy and angular distribution of the projectile-like fragments (PLFs) provides information about the mechanism of incomplete fusion reactions [1][2][3][4][5][6][7][8][9]. There is a systematic change in the angular distribution of PLFs with increase in the number of transferred nucleons.…”