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

E. M. Winchester, J. A. Winger, R. Laforest, E. Martin, E. Ramakrishnan, D. J. Rowland, A. Ruangma, S. J. Yennello, G. D. Westfall, A. Vander Molen, E. Norbeck

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Abstract

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.

Original languageEnglish
Article number014601
Pages (from-to)146011-146014
Number of pages4
JournalPhysical Review C - Nuclear Physics
Volume63
Issue number1
DOIs
StatePublished - Jan 2001

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