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Low Energy Charged Particle Spectroscopy of the 12 C + 12 C Reaction

Low Energy Charged Particle Spectroscopy of the 12 C + 12 C Reaction. Jim Zickefoose Department of Physics University of Connecticut, USA. Outline. Experimental setup Preliminary data Upgrade of detection system. CIRCE AMS Accelerator Facility. Provides ultra pure carbon beam.

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Low Energy Charged Particle Spectroscopy of the 12 C + 12 C Reaction

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  1. Low Energy Charged Particle Spectroscopy of the 12C + 12C Reaction Jim Zickefoose Department of Physics University of Connecticut, USA

  2. Outline • Experimental setup • Preliminary data • Upgrade of detection system

  3. CIRCE AMS Accelerator Facility Provides ultra pure carbon beam Typical beam currents of 15-30 μA on target

  4. Target Chamber Detector coincidence to veto cosmic rays Ω=0.19 sr

  5. Sample ΔE-E Matrix E=3.5 MeV d(12C,p)13C Total proton cross section

  6. Preliminary “High”-Energy Proton Data Good agreement between charged particle and gamma ray

  7. Low Counting Rates • Low points on the order of 0.5 counts per day • Large amounts of beam time necessary • Susceptible to background contamination • Any contaminants in the target lighter than carbon may contribute

  8. Background Investigation • 12C beam on Li target • 12C beam on Be target • 12C beam on B target • Be beam on carbon target • 13C beam on carbon target • Target AMS

  9. Need for Improvements • Low counting rates • Measure alpha and proton simultaneously • Beyond 1.5 MeV ?

  10. Bragg Chamber Upgrade Alpha stopped in gas Proton stopped in silicon Larger solid angle than current telescope

  11. Ionization Alpha Proton Plot peak ionization Vs total ionization for particle identification

  12. Summary • Current telescope setup has measured the proton channel down to 1.4 MeV • Structure is seen at 2.0 and 1.5 MeV • The structure greatly increases 12C + 12C reaction rates • A new detector system is under production to measure alpha and proton channels simultaneously

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