Exclusive multidetection and study of projectile breakup at 25 and 35A MeV in 24Mg + 197Au

M. Samri, L. Beaulieu, B. Djerroud, D. Doré, R. Laforest, Y. Larochelle, J. Pouliot, R. Roy, C. St-Pierre, G. C. Ball, A. Galindo-Uribarri, E. Hagberg, D. Horn

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3 Scopus citations

Abstract

The breakup of the projectile 24Mg, excited in peripheral collisions on a gold target, has been investigated at 25 and 35A MeV with a large scintillation-detector array allowing exclusive measurements. Absolute breakup cross sections were deduced and the projectile-like nucleus velocity and excitation energy have been reconstructed. The excitation energy partition between the projectile and the target is found to lay between the limits of equal excitation energy sharing and equal temperature with some evolution from one limit to the other. The statistical nature of the decay mechanism is inferred from global variables. Small-relative-angle analysis is applied to the six-alpha exit channel and the corresponding data were found to be consistent with a sequential evaporation decay mechanism, with some contribution from sequential fission at higher excitation energies. The time scale involved in the breakup of 24Mg projectiles into the 6α and the 5αHH channels has been investigated by examining distortions in the fragment velocity distributions due to the Coulomb field of the target. A decrease in the quasi-projectile lifetime is observed as the mean excitation energy increases from 3.4 to 4.5A MeV.

Original languageEnglish
Pages (from-to)108-130
Number of pages23
JournalNuclear Physics A
Volume609
Issue number1
DOIs
StatePublished - Nov 4 1996

Keywords

  • Deduced time scale
  • E = 25A MeV; E = 35A MeV
  • Measured multiple projectile breakup
  • Model calculations
  • Nuclear reactions Au(Mg,X)
  • Reconstructed excitation energy

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