12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Quasi-elastic binary breakup in the interaction of 12C with 12C, 93Nb and 197Au at 400 MeV incident energy

Presented by Mr. Joele MIRA on 13 Jul 2011 from 12:00 to 12:15
Type: Oral Presentation
Session: NPRP
Track: Track B - Nuclear, Particle and Radiation Physics

Content

<p>In heavy ion reactions the emission of Intermediate Mass Fragments (IMFs) at forward angles is dominated by the direct break-up process. To improve our understanding of this process in the reaction mechanisms involving the interaction of light projectiles with light to heavy target nuclei, a coincidence measurement was performed at iThemba LABS. Standard ΔE-E detector telescopes were used to identify and measure the energies of the of the correlated <sup>8</sup>Be and alpha particles produced in the binary break-up of <sup>12</sup>C projectiles at an incident energy of 400 MeV. While the <sup>8</sup>Be fragments were detected in their ground state at a fixed angle of 9º, the correlated alpha particles were measured on the opposite side of the beam, covering an angular range from 16º to 26º. Two dimensional energy spectra were generated for each alpha-particle angle in order to distinguish quasi-elastic events from inelastic break-up events. These spectra also allowed to identify events originating from the interaction of the <sup>12</sup>C beam with an H contaminant on the target foils and to subsequently correct for these events in the extraction of angular distributions for alpha particles in coincidence with quasi-elastic <sup>8</sup>Be particles. The angular distributions obtained from the interaction of <sup>12</sup>C with <sup>93</sup>Nb and <sup>197</sup>Au show a smooth decreasing trend with respect to the alpha-particle angle, which suggests that the binary break-up of <sup>12</sup>C seems to be independent of the target nucleus. A deviation from this trend is however observed for the <sup>12</sup>C target. As a first attempt to interpret these results a comparison between the measured angular distributions and GEANT4 simulations will be presented.

Level (Hons, MSc, PhD, other)?

PhD

Consider for a student award (Yes / No)?

Yes

Short Paper

Yes

Place

Location:
Room: Acro8


Primary authors

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Co-authors

  • Dr. S. V FORTSCH Department of Nuclear Physics, iThemba Labs, Old Faure Road, Faure 7130
  • Dr. G. F STEYN Department of Nuclear Physics, iThemba Labs, Old Faure Road, Faure 7130
  • Dr. P PAPKA Department of Physics, University of Stellenbosch, Stellenbosch South Africa
  • Dr. Z. B BUTHELEZI Department of Nuclear Physics, iThemba Labs, Old Faure Road, Faure 7130
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