Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr 
isotopes in the vicinity of A ≈ 100

Simon, Vanessa V.; Brunner, T.; Chowdhury, U.; Eberhardt, B.; Ettenauer, S.; Gallant, A.T.; Mané, E.; Simon, M.C.; Delheij, P.; Pearson, M.R.; Audi, G.; Gwinner, G.; Lunney, D.; Schatz, H.; Dilling, J.

doi:10.1103/PhysRevC.85.064308

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Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A ≈ 100

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Simon, Vanessa V.
TRIUMF;
Department of Physics and Astronomy, University of Heidelberg;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevC.85.064308
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1204.4139v2
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Citation

Simon, V. V., Brunner, T., Chowdhury, U., Eberhardt, B., Ettenauer, S., Gallant, A., et al. (2012). Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A ≈ 100. Physical Review C, 85(6): 064308, pp. 1-11. doi:10.1103/PhysRevC.85.064308.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-A329-0

Abstract

The neutron-rich mass region around A≈100 presents challenges for modeling the astrophysical r process because of rapid shape transitions. We report on mass measurements using the TITAN Penning trap at TRIUMF-ISAC to attain more reliable theoretical predictions of r-process nucleosynthesis paths in this region. A new approach using highly charged (q=15+) ions has been applied which considerably saves measurement time and preserves accuracy. New mass measurements of neutron-rich ^94,97,98Rb and ^94,97–99Sr have uncertainties of less than 4 keV and show deviations of up to 11σ when compared to previous measurements. An analysis using a parameterized r-process model is performed and shows that mass uncertainties for the A=90 abundance region are eliminated.