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Recent experiments with low-energy carbon beams

CLAUS2009. Recent experiments with low-energy carbon beams. El í F. Aguilera Instituto Nacional de Investigaciones Nucleares, México. EXP. 1: 12 C+ 12 C sub-Coulomb fusion. INTEREST OF THE 12 C+ 12 C SYSTEM: 1.- Carbon-burning in stars. 2.- Quasimolecular resonances.

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Recent experiments with low-energy carbon beams

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  1. CLAUS2009 Recent experiments with low-energy carbon beams Elí F. Aguilera Instituto Nacional de Investigaciones Nucleares, México

  2. EXP. 1: 12C+12C sub-Coulomb fusion INTEREST OF THE 12C+12C SYSTEM: • 1.- Carbon-burning in stars. • 2.- Quasimolecular resonances. • 3.- Optical-model systematics (el. chan.).

  3. The phenomenon of carbon buildup under bombardment with ions might introduce unwanted complications, especially when the target itself is made up of carbon. The energy loss in the carbon layer deposited on the target affects the effective reaction energy and, in the case of a carbon target, its thickness is also affected. Goal: to use an improved normalization method within the γ -ray technique, with continuous carbon-buildup monitoring, in order to get reliable absolute cross section values and corresponding reaction energies for the fusion of 12C + 12C. EC.M. = 4.42- 6.48 MeV, ΔE=75 keV

  4. EXPERIMENTAL ARRANGEMENT

  5. Target-thickness and beam-yield monitoring: Np

  6. NON OVERLAPPING RESONANCES: =

  7. 1.13x1016

  8. EXP. 2: 12C+4He elastic scattering at θc.m.=180° INTEREST OF 12C+4He elastic scattering: • 12C(α,γ)16O determines the 12C/16O ratio and subsequent stellar evolution (Gamow peak @ 300 keV). • 12C(α, α)12C data can help constrain SE2, the E2 part of the S-Factor for12C(α,γ)16O. • θc.m.=180° ═› max res. sc. and min pot. sc.

  9. Experimental setup: Inverse Kinematics, thick gas target

  10. TYPICAL α SPECTRA

  11. Δ=26 keV Recoil protons Not seen Δ=0.62 keV

  12. SUMMARY • Two experiments were described • 12C+12C fusion: • a) new parameters for quasimolecular resonances • b) lower bound for S(1.5 MeV)~1.13x1016 MeV b • 12C+α elastic scattering: • a) good energy resolution with iktt technique • b) selfconsistent results, except at very low energies, where σ is known to be Rutherford • c) more work needed with theoretical analysis

  13. COLLABORATORS • Enrique Martinez-Quiroz ININ • Ghiraldo Murillo ININ • David Lizcano ININ • Paola Rosales ININ • Marco Fernández ININ • Michael Wiescher Notre Dame • Vladilen Goldberg Texas A&M

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