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Nuclear Astrophysics Experiments in ATOMKI

The Nuclear Astrophysics group at ATOMKI in Debrecen, Hungary, conducts essential experiments utilizing advanced accelerator facilities including 1 MV and 5 MV Van de Graaff accelerators, and a 20 MeV cyclotron. The research focuses on the p-process, investigating the production mechanisms of heavy, proton-rich isotopes (p-nuclei). This involves measuring proton and alpha capture cross sections, and comparing experimental data with statistical model predictions. Collaborations span across renowned universities and institutions, enhancing the understanding of nuclear reactions in astrophysical contexts.

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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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