Mass measurements of neutron-rich Rb and Sr isotopes
| Autor: | A. Bader, Jens Dilling, Vanessa V. Simon, M.C. Simon, U. Chowdhury, A. Lennarz, Jennifer Fallis, T.D. Macdonald, Maxime Brodeur, A. Chaudhuri, Daniel Lascar, A. A. Kwiatkowski, B. E. Schultz, S. Seeraji, Aaron Gallant, K. G. Leach, A. Grossheim, R. Klawitter, J. Pearkes |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Isotope 010308 nuclear & particles physics FOS: Physical sciences Mass spectrometry 01 natural sciences 7. Clean energy Atomic mass Ion Nuclear physics Nucleosynthesis 0103 physical sciences Neutron Präzisionsexperimente - Abteilung Blaum Atomic physics Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Excitation |
| Zdroj: | Physical Review C |
| DOI: | 10.48550/arxiv.1512.07105 |
| Popis: | 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. Comment: 8 pages, 5 figures |
| Databáze: | OpenAIRE |
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