Mass measurements beyond the major r-process waiting point 80Zn

Details Mass measurements beyond the major r-process waiting point 80Zn Mass measurements beyond the major r-process waiting point 80Zn

2008-11-14

arxiv.org/abs/0811.2294v1

Phys.Rev.Lett.101:262501,2008

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.262501

High-precision mass measurements on neutron-rich zinc isotopes 71m,72-81Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time the mass of 81Zn has been experimentally determined. This makes 80Zn the first of the few major waiting points along the path of the astrophysical rapid neutron capture process where neutron separation energy and neutron capture Q-value are determined experimentally. As a consequence, the astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N = 50 shell closure for Z = 30 farther from stability.

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