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HK: Physik der Hadronen und Kerne

HK 34: Nuclear and Particle Astrophysics II

HK 34.5: Vortrag

Mittwoch, 10. März 2004, 15:15–15:30, F

Systematic study of α–nucleus potentials for the astrophysical p–process^* — •D. Galaviz¹, Zs. Fülöp², Gy. Gyürky², G. Kiss², A. Kretschmer¹, Z. Máté², P. Mohr¹, S. Müller¹, T. Rauscher³, E. Somorjai², and A. Zilges¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt, D–64289 Darmstadt, Deutschland — ²ATOMKI, H–4001 Debrecen, Ungarn — ³Institut für Physik, Universität Basel, CH–4056 Basel, Schweiz

The majority of the heavy proton-rich nuclei, the so-called p–nuclei, are believed to be produced during supernova explosions in the outer layers of very massive stars [1] in the so-called p–process where photon-induced reactions play the dominant role.
The lack of experimental data in the relevant energy region for these reactions, in particular (γ,α) reactions, demands for direct and indirect measurements in order to determine the α-nucleus potentials for p–nuclei. Therefore, we have measured the elastic scattering of α particles on different p–nuclei at energies close to the Coulomb barrier [2-4].
In this work we present the results of high precision elastic α scattering experiments on the p-nucleus ¹⁰⁶Cd and on the semi-magic nucleus ⁸⁹Y performed at the cyclotron accelerator at ATOMKI, Debrecen.
^* supported by DFG (SFB 634 and Zi 510/2-2),  GSI(DA-ZIL), Swiss NSF grant 2000-061031.02, and OTKA (T034259, F043408 and T042733).

[1] M. Rayet et al., Astron. Astrophys. 227, 271 (1990)

[2] P. Mohr et al., Phys. Rev. C 55, 1523 (1997).

[3] Zs. Fülöp et al., Phys. Rev. C 64, 065805 (2001)

[4] D. Galaviz et al., Nucl. Phys. A719,111c (2003)