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The neutron-rich mass region around $A\approx100$ presents challenges formodeling the astrophysical $r$-process because of rapid shape transitions. Wereport on mass measurements using the TITAN Penning trap at TRIUMF-ISAC toattain more reliable theoretical predictions of $r$-process nucleosynthesispaths in this region. A new approach using highly charged ($q=15+$) ions hasbeen applied which considerably saves measurement time and preserves accuracy.New mass measurements of neutron-rich $^{94,97,98}$Rb and $^{94,97-99}$Sr haveuncertainties of less than 4 keV and show deviations of up to 11$\sigma$ toprevious measurements. An analysis using a parameterized $r$-process model isperformed and shows that mass uncertainties for the A=90 abundance region areeliminated.

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