Mass measurements of neutron-rich Rb and Sr isotopes

R. Klawitter, A. Bader, M. Brodeur, U. Chowdhury, A. Chaudhuri, J. Fallis, A. T. Gallant, A. Grossheim, A. A. Kwiatkowski, D. Lascar, K. G. Leach, A. Lennarz, T. D. Macdonald, J. Pearkes, S. Seeraji, M. C. Simon, V. V. Simon, B. E. Schultz, J. Dilling

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Abstract

We report on the mass measurements of several neutron-rich Rb and Sr isotopes in the A≈100 region with the TITAN Penning-trap mass spectrometer. By using highly charged ions in the charge state q=10+, the masses of Rb98,99 and Sr98-100 have been determined with a precision of 6-12 keV, making their uncertainty negligible for r-process nucleosynthesis network calculations. The mass of Sr101 has been determined directly for the first time with a precision eight times higher than the previous indirect measurement and a deviation of 3σ when compared to the Atomic Mass Evaluation. We also confirm the mass of Rb100 from a previous measurement. Furthermore, our data indicate the existence of a low-lying isomer with 80keV excitation energy in Rb98. We show that our updated mass values lead to minor changes in the r process by calculating fractional abundances in the A≈100 region of the nuclear chart.

Original languageEnglish (US)
Article number045807
JournalPhysical Review C
Volume93
Issue number4
DOIs
StatePublished - Apr 14 2016

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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