Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.6: Talk

Tuesday, March 17, 2009, 15:45–16:00, H-ZO 60

First direct mass measurement of the proton rich nuclides ^85,86,87Mo and ⁸⁷Tc — •Emma Haettner — Justus-Liebig Universität, Gießen — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

The masses of proton rich nuclides in the vicinity of N=Z=43 were measured with the Penning trap mass spectrometer SHIPTRAP at GSI. These nuclei were produced in the fusion-evaporation reaction ³⁶Ar+⁵⁴Fe at energies of 5.0 and 5.9 MeV/u and separated at the velocity filter SHIP. The data are of astrophysical interest since these nuclei are believed to be a part of the rp and νp process paths.

The masses of ⁸⁵Mo and ⁸⁷Tc were measured for the first time. The masses of another two nuclides, ^86,87Mo, were determined for the first time in a direct mass measurement. For these nuclides the mass excess deviates from values of the 2003 Atomic Mass Evaluation by up to 1.5 MeV, indicating a systematic shift of the mass surface in this region of the nuclear chart. Additionally, the masses of ⁸⁶Zr and ⁸⁵Nb were measured and found to be in agreement with the values obtained at JYFLTRAP. The experiment as well as preliminary data on mass values, separation energies and their impact on network calculations of the rp and νp processes will be presented.