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26 April 2024

» arxiv » 1512.7105

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Mass measurements of neutron-rich Rb and Sr isotopes
R. Klawitter ; A. Bader ; M. Brodeur ; U. Chowdhury ; A. Chausdhuri ; 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 ;
Date:	22 Dec 2015
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 $3sigma$ 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 $Aapprox 100$ region of the nuclear chart.
Source:	arXiv, 1512.7105
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