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Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first r-process abundance peak in neutron-star merger calculations

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Klawitter,  Renee
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Reiter, M. P., San Andres, S. A., Nikas, S., Lippuner, J., Andreoiu, C., Babcock, C., et al. (2020). Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first r-process abundance peak in neutron-star merger calculations. Physical Review C, 101(2): 025803. doi:10.1103/PhysRevC.101.025803.


Cite as: http://hdl.handle.net/21.11116/0000-0008-1C7B-0
Abstract
We report mass measurements of neutron-rich Ga isotopes Ga80-85 with TRIUMF's Ion Trap for Atomic and Nuclear science. The measurements determine the masses of Ga80-83 in good agreement with previous measurements. The masses of Ga-84 and Ga-85 were measured for the first time. Uncertainties between 25 and 48 keV were reached. The new mass values reduce the nuclear uncertainties associated with the production of A approximate to 84 isotopes by the r-process for astrophysical conditions that might be consistent with a binary neutron star (BNS) merger producing a blue kilonova. Our nucleosynthesis simulations confirm that BNS merger may contribute to the first abundance peak under moderate neutron-rich conditions with electron fractions Y-e = 0.35-0.38.