Mass measurements of neutron-rich Rb and Sr isotopes

Abstract

We report on the mass measurements of several neutron-rich $\mathrm{Rb}$ and $\mathrm{Sr}$ isotopes in the $A\approx 100$ region with the TITAN Penning-trap mass spectrometer. Using highly charged ions in the charge state $q=10+$, the masses of ${}^{98,99}\mathrm{Rb}$ and ${}^{98-100}\mathrm{Sr}$ have been determined with a precision of $6-12\mathrm{keV}$, making their uncertainty negligible for r-process nucleosynthesis network calculations. The mass of ${}^{101}\mathrm{Sr}$ has been determined directly for the first time with a precision eight times higher than the previous indirect measurement and a deviation of $3\sigma$ when compared to the Atomic Mass Evaluation. We also confirm the mass of ${}^{100}\mathrm{Rb}$ from a previous measurement. Furthermore, our data indicates the existance of a low-lying isomer with $80\mathrm{keV}$ excitation energy in ${}^{98}\mathrm{Rb}$. We show that our updated mass values lead to minor changes in the r-process by calculating fractional abundances in the $A\approx 100$ region of the nuclear chart.

8 pages, 5 figures

References in corpus (5)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Precision Atomic Physics Techniques for Nuclear Physics with Radioactive Beams
• Mass measurements near the $r$-process path using the Canadian Penning Trap mass spectrometer
• Sensitivity of the r-process to nuclear masses
• Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of $A\approx 100$

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