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Nuclear Astrophysics Experiments in ATOMKI

Nuclear Astrophysics Experiments in ATOMKI. Gy. Gy ürky Institute of Nuclear Research (ATOMKI) Debrecen, Hungary. Institute of Nuclear Research (ATOMKI). Nuclear Astrophysics group: Z. Elekes Gy. Gyürky Zs. Fülöp G.G. Kiss E. Somorjai. Debrecen. Accelerator facilities.

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Nuclear Astrophysics Experiments in ATOMKI

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  1. Nuclear Astrophysics Experiments in ATOMKI Gy. Gyürky Institute of Nuclear Research (ATOMKI) Debrecen, Hungary

  2. Institute of Nuclear Research (ATOMKI) • Nuclear Astrophysics group: • Z. Elekes • Gy. Gyürky • Zs. Fülöp • G.G. Kiss • E. Somorjai Debrecen

  3. Accelerator facilities • 1 MV and 5MV Van de Graaff accelerator microbeam, talk by Alíz Simon tomorrow • 20 MeV cyclotron  proton and alpha energy range from 300 keV to 20 MeV • ECR ion source • tandem for AMS (in installation)

  4. Nuclear astrophysics: p-process • production mechanism of heavy, proton rich isotopes (p-nuclei) • for the p-process modeling huge reaction network is needed • reaction rates are taken from statistical models  experimental check necessary • proton and alpha capture cross section measurements • alpha elastic scattering experiments

  5. Capture cross section measurements Astrophysically important energy range for • (p,) reactions: 1-5 MeV  5MV Van de Graaff accelerator • (,) reactions: 5-15 MeV  20 MeV cyclotron measured cross sections compared with model calculations Measurements directly in the Gamow window!!!

  6. 70Ge(p,)71As G.G. Kiss et al., Phys Rev C, submitted

  7. Alpha elastic scattering experiments • Optical model potentials (OMP) are used in statistical model calculations • OMP can be derived from  elastic scattering experiments • The measured angular distribution can be compared with global OMPs • Experiments carried out with the cyclotron near the Coulomb barrier

  8. D. Galaviz et al, Phys. Rev. C 71 (2005) 065802.

  9. Summary of measured reactions

  10. Collaborations • Notre Dame University, USA • TU Darmstadt, Germany • Demokritos, Athens, Greece • Kocaeli University, Turkey • University of Basel, Switzerland

  11. Other activities in nuclear astrophysics • Complementary studies for the LUNA collaboration. Example: test of the beam stop purity used for the 3He(,)7Be experiments D. Bemmerer et al. Phys Rev. Lett. 97 (2006) 122502. Gy. Gyürky et al. Phys Rev. C75 (2006) 035805. • 7Be isotope production for various purposes • Application of the Trojan Horse Method. Example: p+p elastic scattering measured via the p+d  p+p+n reaction A. Tuminoet al. Phys Rev. Lett. 98 (2007) 252502.

  12. ATOMKI experiment previous THM data two body p+p cross section from p+d  p+p+n reaction A. Tumino et al. Phys Rev. Lett. 98 (2007) 252502.

  13. Conference organization • Nuclear Physics in Astrophysics, 2002 17th International Nuclear Physics Conference of the European Physical Society • Nuclear Physics in Astrophysics II, 2005 20th International Nuclear Physics Conference of the European Physical Society

  14. Thank you for your attention!

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