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

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

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

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

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

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

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

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

Summary of measured reactions proton induced reactions alpha induced reaction alpha elastic scattering 84 Sr(p, ) 85 Y 70 Ge(, ) 74 Se 89 Y(, ) 89 Y* 86 Sr(p, ) 87 Y 106 Cd(, ) 110 Sn 92 Mo(, ) 92 Mo 87 Sr(p, ) 88 Y 106 Cd(,n) 109 Sn 106 Cd(, ) 106 Cd 74 Se(p, ) 75 Br 106 Cd(,p) 109 In 110 Cd(, ) 110 Cd* 76 Se(p, ) 76 Br 144 Sm(, ) 148 Gd 116 Cd(, ) 116 Cd* 82 Se(p,n) 82 Br 112 Sn(, ) 112 Sn 106 Cd(p, ) 107 In 124 Sn(, ) 124 Sn 108 Cd(p, ) 109 In 144 Sm(, ) 144 Sm 70 Ge(p, ) 71 As* * to be published 76 Ge(p,n) 76 As* 85 Rb(p,n) 85 Sr*

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

Other activities in nuclear astrophysics Complementary studies for the LUNA collaboration. Example: test of the beam stop purity used for the 3 He(, ) 7 Be experiments Complementary studies for the LUNA collaboration. Example: test of the beam stop purity used for the 3 He(, ) 7 Be experiments D. Bemmerer et al. Phys Rev. Lett. 97 (2006) Gy. Gyürky et al. Phys Rev. C 75 (2006) Be isotope production for various purposes 7 Be 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 Application of the Trojan Horse Method. Example: p+p elastic scattering measured via the p+d p+p+n reaction A. Tumino et al. Phys Rev. Lett. 98 (2007)

ATOMKI experiment previous THM data two body p+p cross section from p+d p+p+n reaction

Conference organization Nuclear Physics in Astrophysics, th International Nuclear Physics Conference of the European Physical Society Nuclear Physics in Astrophysics, th International Nuclear Physics Conference of the European Physical Society Nuclear Physics in Astrophysics II, th International Nuclear Physics Conference of the European Physical Society Nuclear Physics in Astrophysics II, th International Nuclear Physics Conference of the European Physical Society

Thank you for your attention!