Nuclear Astrophysics Nuclear Astrophysics Experiments in Experiments in

ATOMKIATOMKI

Gy. GyGy. Gyürkyürky

Institute of Nuclear Research (ATOMKI)Institute of Nuclear Research (ATOMKI)

Debrecen, HungaryDebrecen, Hungary

Institute of Nuclear Research Institute of Nuclear Research (ATOMKI)(ATOMKI)

DebrecenNuclear Astrophysics group:

• Z. Elekes• Gy. Gyürky• Zs. Fülöp• G.G. Kiss• E. Somorjai

Accelerator facilitiesAccelerator facilities

►1 MV and 5MV Van de Graaff accelerator1 MV and 5MV Van de Graaff accelerator microbeam, talk by Almicrobeam, talk by Alíz Simon íz Simon tomorrowtomorrow

►20 MeV cyclotron20 MeV cyclotron proton and alpha energy range from proton and alpha energy range from 300 keV to 20 MeV300 keV to 20 MeV

►ECR ion sourceECR ion source►tandem for AMS (in installation)tandem for AMS (in installation)

Nuclear astrophysics: p-Nuclear astrophysics: p-processprocess

►production mechanism of heavy, proton production mechanism of heavy, proton rich isotopes (p-nuclei)rich isotopes (p-nuclei)

► for the p-process modeling huge for the p-process modeling huge reaction network is neededreaction network is needed

►reaction rates are taken from statistical reaction rates are taken from statistical models models experimental check necessary experimental check necessary

►proton and alpha capture cross section proton and alpha capture cross section measurementsmeasurements

►alpha elastic scattering experiments alpha elastic scattering experiments

Capture cross section Capture cross section measurementsmeasurements

Astrophysically important energy range Astrophysically important energy range for for

►(p,(p,) reactions: 1-5 MeV ) reactions: 1-5 MeV 5MV Van de 5MV Van de Graaff acceleratorGraaff accelerator

►((,,) reactions: 5-15 MeV ) reactions: 5-15 MeV 20 MeV 20 MeV cyclotroncyclotron

measured cross sections compared with measured cross sections compared with

model calculations model calculations

Measurements directly in the Gamow window!!!

70Ge(p,)71As

G.G. Kiss et al., Phys Rev C, submitted

Alpha elastic scattering Alpha elastic scattering experimentsexperiments

►Optical model potentials (OMP) are Optical model potentials (OMP) are used in statistical model calculations used in statistical model calculations

►OMP can be derived from OMP can be derived from elastic elastic scattering experimentsscattering experiments

►The measured angular distribution can The measured angular distribution can be compared with global OMPsbe compared with global OMPs

►Experiments carried out with the Experiments carried out with the cyclotron near the Coulomb barriercyclotron near the Coulomb barrier

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

Summary of measured Summary of measured reactionsreactions

proton proton induced induced reactionsreactions

alpha induced alpha induced reactionreaction

alpha elastic alpha elastic scatteringscattering

8484Sr(p,Sr(p,))8585YY 7070Ge(Ge(,,))7474SeSe 8989Y(Y(,,))8989Y*Y*8686Sr(p,Sr(p,))8787YY 106106Cd(Cd(,,))110110SnSn 9292Mo(Mo(,,))9292MoMo8787Sr(p,Sr(p,))8888YY 106106Cd(Cd(,n),n)109109SnSn 106106Cd(Cd(,,))106106CdCd7474Se(p,Se(p,))7575BrBr 106106Cd(Cd(,p),p)109109InIn 110110Cd(Cd(,,))110110Cd*Cd*7676Se(p,Se(p,))7676BrBr 144144Sm(Sm(,,))148148GdGd 116116Cd(Cd(,,))116116Cd*Cd*8282Se(p,n)Se(p,n)8282BrBr 112112Sn(Sn(,,))112112SnSn106106Cd(p,Cd(p,))107107InIn 124124Sn(Sn(,,))124124SnSn108108Cd(p,Cd(p,))109109InIn 144144Sm(Sm(,,))144144SmSm7070Ge(p,Ge(p,))7171As*As*

* to be published* to be published7676Ge(p,n)Ge(p,n)7676As*As*8585Rb(p,n)Rb(p,n)8585Sr*Sr*

CollaborationsCollaborations

►Notre Dame University, USANotre Dame University, USA►TU Darmstadt, GermanyTU Darmstadt, Germany►Demokritos, Athens, GreeceDemokritos, Athens, Greece►Kocaeli University, TurkeyKocaeli University, Turkey►University of Basel, SwitzerlandUniversity of Basel, Switzerland

Other activities in nuclear Other activities in nuclear astrophysicsastrophysics

► Complementary studies for the LUNA Complementary studies for the LUNA collaboration. Example: test of the beam stop collaboration. Example: test of the beam stop purity used for the purity used for the 33He(He(,,))77Be experimentsBe experiments

D. Bemmerer D. Bemmerer et al.et al. Phys Rev. Lett. Phys Rev. Lett. 9797 (2006) 122502 (2006) 122502..

Gy. GGy. Gyürky yürky et al.et al. Phys Rev. Phys Rev. CC 7575 (2006) (2006) 035805.035805.

► 77Be isotope production for various purposes Be isotope production for various purposes ► Application of the Trojan Horse Method. Application of the Trojan Horse Method.

Example: p+p elastic scattering measured Example: p+p elastic scattering measured via the p+d via the p+d p+p+n reaction p+p+n reaction

A. TuminoA. Tumino et al.et al. Phys Rev. Lett. Phys Rev. Lett. 9988 (200 (20077) ) 252525250202..

A. Tumino A. Tumino et al.et al. Phys Rev. Lett. Phys Rev. Lett. 9988 (200 (20077) ) 252525250202..

ATOMKI experimentprevious THM data

two body p+p cross section two body p+p cross section from p+d from p+d p+p+n reaction p+p+n reaction

Conference organizationConference organization►Nuclear Physics in Astrophysics, 2002 Nuclear Physics in Astrophysics, 2002 17th 17th

International Nuclear Physics Conference of the European Physical International Nuclear Physics Conference of the European Physical SocietySociety

►Nuclear Physics in Astrophysics II, 2005 Nuclear Physics in Astrophysics II, 2005 20th 20th International Nuclear Physics Conference of the European Physical International Nuclear Physics Conference of the European Physical SocietySociety

Thank you for your attention!