Isospin of intermediate mass fragments produced in peripheral, midperipheral, and central collisions from the 58Ni+12C, 24Mg reactions at 34.5A MeV

Y. Larochelle, L. Gingras, G. C. Ball, L. Beaulieu, P. Gagné, E. Hagberg, Z. Y. He, D. Horn, R. Laforest, R. Roy, C. St-Pierre

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Abstract

Isotopic yields of IMF's produced in the 58Ni+12C,24Mg reactions at 34.5A MeV are investigated. Analysis of experimental data from the CRL-Laval 4 π multidetector array focuses on events where at least 75% (60%) of the charge and momentum were detected for the 58Ni+12C (58Ni+24Mg) system. Averaged isospin ratios (N/Z) for IMF's with Z=3 and 4 are plotted as a function of emission angle and parallel velocity in the center-of-mass frame. Results from simulations with the statistical codes SMM and GEMINI, assuming an equilibrated source, are compared to the experimental ratios. The ratios seem to indicate the presence of a midrapidity necklike structure that would produce IMF's richer in neutrons than the two main emitters, even for very central collisions.

Original languageEnglish
Article number051602
Pages (from-to)516021-516025
Number of pages5
JournalPhysical Review C - Nuclear Physics
Volume62
Issue number5
StatePublished - Nov 2000

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