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Nuclear astrophysics research in ATOMKI

Nuclear astrophysics research in ATOMKI. Gy örgy Gyürky Institute of Nuclear Research (ATOMKI) Debrecen, Hungary. NuPECC meeting, October 7-8, 2011, Budapest, Hungary. nucleosynthesis experiments in ATOMKI. energy generation experiments in international collaboration.

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Nuclear astrophysics research in ATOMKI

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  1. Nuclear astrophysics research in ATOMKI György Gyürky Institute of Nuclear Research (ATOMKI) Debrecen, Hungary NuPECC meeting, October 7-8, 2011, Budapest, Hungary

  2. nucleosynthesis • experiments in ATOMKI • energy generation • experiments in • international collaboration Research activities of the nuclear astrophysics group of ATOMKI Underground experiments: low cross section measurements (LUNA collaboration) Experiments for the astrophyical p-process Study of the electron screening effect Half-life measurements relevant to astrophysics RIB experiments relevant to astrophysics 7Be isotope production for nuclear astrophysics experiment Application of the Trojan Horse indirect method etc...

  3. The LUNA collaboration • Italian-German-British-Hungarian collaboration • Operates the only underground accelerator of the world at LNGS, Gran Sasso, Italy • Measurement of extremely low cross sections of astrophysical reactions

  4. Reactions studied at LUNA 14N(p,)15O 7Be(p,)8B 25Mg(p,)26Al 3He(,)7Be 15N(p,)16O d(p,)3He

  5. 4He 2H 3He 7Li The importance of 3He(,)7Be big-bang nucleosynthesis, 7Li problem pp-chain of Hydrogen burning, solar neutrinos

  6. Old data of 3He(,)7Be S-factor Ambiguous results High uncertainty pp-chain big bang

  7. The LUNA of 3He(,)7Be measurements • Low energies never reached before (Ec.m. = 92 – 170 keV) • With both activation and in-beam methods (good agreement found) • With high precision (<5%)

  8. The LUNA results Solar 8B neutrino flux uncertainty reduced from ~8% to ~3% Big bang 7Liproblem not solved by 3He(,)7Be D. Bemmerer et al., Phys. Rev. Lett. 97 (2006) 122502 Gy. Gyürkyet al., Phys. Rev. C75 (2007) 035805 F. Confortola et al., Phys. Rev. C75 (2007) 065803

  9. ERNA 3He(,)7Be experiment European Recoil Separator for Nuclear Astrophysics Bochum, Germany (now in Caserta, Italy)

  10. ERNA Results A. di Levaet al., Phys. Rev. Lett. 102 (2009) 232502

  11. 3He(,)7Be: outlook • new measurements in ATOMKI • high energy activation and indirect measurements (ANC)

  12. p-nuclei p-process n capture - decay + decay r-process Experimental study of the astrophysical p-process

  13. The p-process nucleosynthesis • Secondary process initiated on s- and r-seeds • Several sub-processes involved • Most important: -process (-induced reactions) • Models are not able to reproduce the observed p-isotope abundances

  14. Astrophysics: stellar environment temperature density seed abundances time scale etc... Nuclear physics masses decay properties reaction rates!!! Data needs for the p-process • Reaction rates: • based on theory • very few experimental data • high uncertainty • experiments highly needed

  15. Alpha-induced reations: 8-15 MeV  Cyclotron Proton-induced reactions: 1-4 MeV  Van de Graaff Experiments

  16. Capture reaction cross section measurements

  17. Comparison with theory 130Ba(,)134Ce Z. Halász et al., in prep.

  18. Dependence on input parameters 106Cd(,)110Sn Gy. Gyürkyet al., Phys. Rev. C74 (2006) 025805

  19. Fine tuning of parameters G.G. Kisset al., Phys. Rev. Lett. 101 (2008) 191101

  20. Alpha-nucleus optical potential 144Sm(,)148Gd E. Somorjai et al., A&A 333 (1998) 1112.

  21. Direct determination of alpha-nucleus optical potential • High precision elastic scattering experiments • Low energies (around Coulomb-barrier) • Comparison with global optical potentials • Construction of local potentials • Experiments: cyclotron of ATOMKI

  22. Capture and scattering experiments

  23. Measured complete angular distributions /Ruth. G.G. Kisset al., Phys. Rev. C83 (2011) 065807

  24. P-process: Outlook • further needs for experimental data • recognized by the scientific community

  25. For further information... http://www.atomki.hu/atomki/IonBeam/nag/index_en.html

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