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

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.; Lan, Y.; Lascar, D.; Leach, K. G.; Leistenschneider, E.; Martínez-Pinedo, G.; McKay, J. E.; Paul, S. F.; Plaß, W. R.; Roberts, L.; Schatz, H.; Scheidenberger, C.; Sieverding, A.; Steinbrügge, R.; Thompson, R.; Wieser, M. E.; Will, C.; Welch, D.

doi:10.1103/PhysRevC.101.025803

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

Journal Article · Mon Feb 10 00:00:00 EST 2020 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.101.025803· OSTI ID:1603982

^[1]; Ayet San Andrés, S. ^[2]; Nikas, S. ^[3]; Lippuner, J. ^[4]; Andreoiu, C. ^[5]; Babcock, C. ^[6]; Barquest, B. R. ^[6]; Bollig, J. ^[7]; Brunner, T. ^[8]; Dickel, T. ^[2]; Dilling, J. ^[9]; Dillmann, I. ^[10]; Dunling, E. ^[11]; Gwinner, G. ^[12]; Graham, L. ^[6]; Hornung, C. ^[13]; Klawitter, R. ^[14]; Kootte, B. ^[15]; Kwiatkowski, A. A. ^[10]; Lan, Y. ^[9] more »

Justus-Liebig-Univ., GieBen (Germany); TRIUMF, Vancouver, BC (Canada); Univ. of Edinburgh (United Kingdom)
Justus-Liebig-Univ., GieBen (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); JINA-CEE, East Lansing, MI (United States)
Simon Fraser Univ., Burnaby, BC (Canada)
TRIUMF, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Ruprecht-Karls-Univ., Heidelberg (Germany)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom)
Univ. of Manitoba, Winnipeg, MB (Canada)
Justus-Liebig-Univ., GieBen (Germany)
TRIUMF, Vancouver, BC (Canada); Max-Planck-Institut für Kernphysik Heidelberg (Germany)
TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
TRIUMF, Vancouver, BC (Canada); Northwestern Univ., Evanston, IL (United States)
Colorado School of Mines, Golden, CO (United States)
TRIUMF, Vancouver, BC (Canada); Ruprecht-Karls-Univ. Heidelberg (Germany)
Michigan State Univ., East Lansing, MI (United States)
JINA-CEE, East Lansing, MI (United States)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany); Univ. of Minnesota, Minneapolis, MN (United States)
TRIUMF, Vancouver, BC (Canada); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Univ. of Calgary, AB (Canada)

We report mass measurements of neutron-rich Ga isotopes ^80–85Ga with TRIUMF's Ion Trap for Atomic and Nuclear science. The measurements determine the masses of ^80–83Ga in good agreement with previous measurements. Here, the masses of ⁸⁴Ga and ⁸⁵Ga 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 Y_e = 0.35–0.38.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); Canadian-UK Foundation; German Inst. DFG; German Federal Ministry of Education and Research (BMBF); Helmholtz Association through NAVI

Grant/Contract Number:: AC52-06NA25396; 89233218CNA000001; PHY-1419765; PHY-1614130; SC0017649; ST/L005816/1; ST/L005743/1; FR 601/3-1; SFB 1245; 05P15RGFN1; 05P12RGFN8; VH-VI-417

OSTI ID:: 1603982

Report Number(s):: LA-UR-18-28439; PRVCAN; TRN: US2104169

Journal Information:: Physical Review C, Vol. 101, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 12 works

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59 ≤ A ≤ 89
Spectrometers & spectroscopic techniques

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