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HK: Fachverband Physik der Hadronen und Kerne

HK 55: Nukleare Astrophysik III

HK 55.7: Vortrag

Donnerstag, 18. März 2010, 18:30–18:45, HG VI

Mass measurements of the proton-rich nuclides ^85,86,87Mo and ⁸⁷Tc and their impact on the rp-process — •E. Haettner^1,2, D. Ackermann², G. Audi³, K. Blaum^2,4, M. Block², S. Eliseev⁴, F. Herfurth², F.P. Hessberger², T. Fleckenstein¹, S. Hofmann², J. Ketelaer⁵, J. Ketter⁵, Yu. Novikov⁶, W.R. Plaß^1,2, S. Rahaman⁷, D. Rodríguez⁸, H. Schatz⁹, C. Scheidenberger^1,2, L. Schweikhard¹⁰, B. Sun¹, P.G. Thirolf¹¹, G. Vorobjev², M. Wang³, and C. Weber⁷ — ¹Universität Gießen — ²GSI Darmstadt — ³Universite de Paris-Sud, France — ⁴MPIK Heidelberg — ⁵Universität Mainz — ⁶PNPI, Gatchina, Russia — ⁷University of Jyväskylä, Finland — ⁸Universidad de Huelva, Spain — ⁹Michigan State University, USA — ¹⁰Universität Greifswald — ¹¹LMU München

The masses of the proton-rich nuclides ^85,86,87Mo and ⁸⁷Tc have been measured with the Penning trap mass spectrometer SHIPTRAP at GSI. The measured mass excesses of these nuclei deviate from the values of the Atomic Mass Evaluation 2003 by up to 1.6 MeV, indicating a systematic shift of the mass surface in this region compared to previous measurements. A local mass extrapolation based on the new results has been made for the mass range A=80-95. Measured and extrapolated mass values and the derived separation energies have been compared to theoretical mass models. Taking into account the new mass excess values, rp-process network calculations have been performed. Preliminary results show changes in the final abundances for A=86-92 by up to a factor of 30. Results of measurements and calculations will be presented, and the issue of a potential Zr-Nb cycle will be addressed.