Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.11: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Photoneutron reaction rates of the nuclei ^191,193Ir^* — •A. Kretschmer¹, D. Galaviz¹, S. Müller¹, T. Rauscher², K. Sonnabend¹, K. Vogt¹, and A. Zilges¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany — ²Institut für Physik, Universität Basel, CH-4056 Basel, Switzerland

The cross section and the astrophysical ground state reaction rates of the reactions ¹⁹¹Ir(γ,n)¹⁹⁰Ir and ¹⁹³Ir(γ,n)¹⁹²Ir have been measured close above the neutron separation energies at E_thr = 8.07 MeV and E_thr = 7.77 MeV, respectively, using the method of photoactivation. The results are important for a better understanding of the s- and p-process [1,2,3,4] in this region of the chart of nuclides. They will be compared to theoretical calculations as well as to other experimental data. ^* supported by the DFG (SFB 634 and Zi 510/2-2) and by the Swiss NSF (grants 2124-055832.98, 2000-061822.00, 2024-067428).

[1] B. L. Berman et al., Phys. Rev. C 36, 1286 (1987)

[2] S. C. Fultz et al., Phys. Rev. 127, 1273 (1962)

[3] P. Mohr et al., Phys. Lett. B488, 127 (2000)

[4] K. Sonnabend et al., Astrophys. J. 583, 506 (2003)