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

M. P. Reiter, S. Ayet San Andrés, S. Nikas, J. Lippuner, C. Andreoiu, C. Babcock, B. R. Barquest, J. Bollig, T. Brunner, T. Dickel, J. Dilling, I. Dillmann, E. Dunling, G. Gwinner, L. Graham, C. Hornung, R. Klawitter, B. Kootte, A. A. Kwiatkowski, Y. LanD. Lascar, K. G. Leach, E. Leistenschneider, G. Martínez-Pinedo, J. E. McKay, S. F. Paul, W. R. Plaß, L. Roberts, H. Schatz, C. Scheidenberger, A. Sieverding, R. Steinbrügge, R. Thompson, M. E. Wieser, C. Will, D. Welch

Research output: Contribution to journalArticle

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 Ga84 and Ga85 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≈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 Ye=0.35-0.38.

Original languageEnglish (US)
Article number025803
JournalPhysical Review C
Volume101
Issue number2
DOIs
StatePublished - Feb 2020

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Reiter, M. P., Ayet San Andrés, S., Nikas, S., Lippuner, J., Andreoiu, C., Babcock, C., Barquest, B. R., Bollig, J., Brunner, T., Dickel, T., Dilling, J., Dillmann, I., Dunling, E., Gwinner, G., Graham, L., Hornung, C., Klawitter, R., Kootte, B., Kwiatkowski, A. A., ... Welch, D. (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]. https://doi.org/10.1103/PhysRevC.101.025803