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arXiv · 1204.4139

Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of $A\approx100$

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

The neutron-rich mass region around $A\approx100$ 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 $^{94,97,98}$Rb and $^{94,97-99}$Sr have uncertainties of less than 4 keV and show deviations of up to 11$σ$ 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.

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V. V. Simon, T. Brunner, U. Chowdhury, B. Eberhardt, S. Ettenauer, A. T. Gallant, E. Mané, M. C. Simon, P. Delheij, M. R. Pearson, G. Audi, G. Gwinner, D. Lunney, H. Schatz, J. Dilling. 2012-05-29. Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of $A\approx100$. https://doi.org/10.1103/physrevc.85.064308

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