Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions Academic Article uri icon


  • The enhancement in the production of even-Z nuclei observed in nuclear fission has also been observed in fragments produced from heavy ion collsions. Beams of 40Ar, 40Cl, and 40Ca at 25 MeV/nucleon were impinged on 58Fe and 58Ni targets. The resulting fragments were detected using the MSU 4 π detector array, which had additional silicon detectors for better isotopic resolution. Comparison of the ratios of yields for each element showed enhancement of even-Z fragment production. The enhancement was more pronounced for reactions with a greater difference in the N/Z of the compound system. However, this effect was less for systems that were more neutron rich. The average N/Z for fragments also displayed an odd-even effect with a lower average N/Z for the even-Z fragments. This is related to the greater availability of neutron-poor isotopes for even-Z nuclei.

author list (cited authors)

  • Winchester, E. M., Winger, J. A., Laforest, R., Martin, E., Ramakrishnan, E., Rowland, D. J., ... Norbeck, E.

citation count

  • 20

publication date

  • December 2000