Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Precision Spectroscopy III
A 8.4: Vortrag
Dienstag, 20. März 2007, 15:00–15:15, 6G
Mass measurements with SHIPTRAP in the endpoint-region of the rp-process — •Ana Martín1, D. Ackermann1, M. Block2, A. Chaudhuri3, S. Eliseev1, F. Herfurth1, F.P. Heßberger1, S. Hofmann1, H.-J. Kluge1, G. Maero1, J.B. Neumayr4, W. Plaß5, C. Rauth1, L. Schweikhard3, P.G. Thirolf4, and G. Vorobjev1 — 1GSI — 2NSCL — 3Universität Greifswald — 4Universität München — 5Universität Gießen, for the SHIPTRAP collaboration.
SHIPTRAP works nowadays as a precision Penning trap mass spectrometer for the products of the fusion-evaporation reactions generated at the velocity filter SHIP at GSI. The fusion evaporation residues are stopped in a helium-gas filled stopping cell. The ions are guided by an extraction RFQ structure, and enter an RFQ buncher for accumulation and cooling. The generated bunch of ions is later injected in the double Penning trap system placed in a superconducting magnet of 7 T. The first trap is dedicated to the isobaric selection of the sample and the second one to the mass measurement using the TOF-ICR method.
Mass measurements can help determining nucleo-synthesis paths if the uncertainty of the mass measurement is no larger than 10 keV for the waiting point nuclei. In February 2006, two runs took place at SHIPTRAP in order to study the end point region of the rp-process. A target of 58Ni was irradiated with a 58Cr beam during the first run and a 58Ni beam during the second one. The masses of 24 isotopes in the 100Sn region were determined with relative uncertainties between 1·10−7 and 5·10−8.