Title: Mass measurements of 60–63Ga reduce x-ray burst model uncertainties and extend the evaluated T=1 isobaric multiplet mass equation

Journal Article · · Physical Review. C
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  1. TRIUMF, Vancouver, BC (Canada); Ruprecht Karls Univ. Heidelberg (Germany); OSTI
  2. Justus-Liebig Univ., Giessen (Germany)
  3. TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
  4. TRIUMF, Vancouver, BC (Canada); Ruprecht Karls Univ. Heidelberg (Germany)
  5. TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom)
  6. TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
  7. Justus-Liebig Univ., Giessen (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  8. TRIUMF, Vancouver, BC (Canada)
  9. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
  10. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  11. TRIUMF, Vancouver, BC (Canada); Appalachian State University, Boone, NC (United States)
  12. TRIUMF, Vancouver, BC (Canada); Colorado School of Mines, Golden, CO (United States)
  13. Univ. of British Columbia, Vancouver, BC (Canada)
  14. TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
  15. Univ. of Manitoba, Winnipeg, MB (Canada)
  16. Université Paris-Saclay, Orsay (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). National Inst. of Nuclear and Particle Physics (IN2P3)
  17. Univ. of Edinburgh, Scotland (United Kingdom)
  18. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Joint Inst. for Nuclear Astrophysics (JINA), East Lansing, MI (United States). Center for the Evolution of the Elements (JINA-CEE); Michigan State Univ., East Lansing, MI (United States)
  19. CENBG (CNRS/IN2P3–Université de Bordeaux), Gradignan (France)

We report precision mass measurements of neutron-deficient gallium isotopes approaching the proton drip line. The measurements of 60–63Ga performed with the TITAN multiple-reflection time-of-flight mass spectrometer provide a more than threefold improvement over the current literature mass uncertainty of 61Ga and mark the first direct mass measurement of 60Ga. The improved precision of the 61Ga mass has important implications for the astrophysical rp process, as it constrains essential reaction Q values near the 60Zn waiting point. Based on calculations with a one-zone model, we demonstrate the impact of the improved mass data on prediction uncertainties of x-ray burst models. The first-time measurement of the 60Ga ground-state mass establishes the proton-bound nature of this nuclide, thus constraining the location of the proton drip line along this isotopic chain. Including the measured mass of 60Ga further enables us to extend the evaluated T = 1 isobaric multiplet mass equation up to A = 60.

Research Organization:
Colorado School of Mines, Golden, CO (United States)
Sponsoring Organization:
Brazilian Conselho Nacional de Desenvolvimiento CientÍfico e Technológico (CNPq); German Federal Ministry for Education and Research (BMBF); German Research Foundation (DFG); National Science Foundation (NSF); Science and Technology Facilities Council (STFC); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0017649
OSTI ID:
1979843
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 104; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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