Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 34: Nuclear and Particle Astrophysics II

HK 34.6: Talk

Wednesday, March 10, 2004, 15:30–15:45, F

A measurement of the neutron capture cross sections of ¹⁸⁶Os, ¹⁸⁷Os, and ¹⁸⁸Os. — •Marita Mosconi — for the n_TOF collaboration

The radiative neutron capture cross sections of ¹⁸⁶Os and ¹⁸⁷Os have fundamental importance for the analysis of the Re/Os cosmochronometer. These data allow one to discriminate the amount of ¹⁸⁷Os producted by nucleosynthesis from the one generated by radioactive decay of ¹⁸⁷Re, an information related to onset of nucleosynthesis of the heavy elements.
The capture cross sections of the three stable isotopes ¹⁸⁶Os,¹⁸⁷Os, and ¹⁸⁸Os have been measured at the CERN n_TOF facility in the energy range from 1 eV to ∼ 1 MeV. This contribution reports on preliminary cross section results.