Searching for the origin of the rare-earth peak with precision mass measurements across Ce–Eu isotopic chains
- McGill University, Montreal, QC (Canada); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- University of Notre Dame, IN (United States); TRIUMF, Vancouver, BC (Canada)
- Argonne National Laboratory (ANL), Argonne, IL (United States); University of Manitoba, Winnipeg, MB (Canada)
- North Carolina State University, Raleigh, NC (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States); University of Chicago, IL (United States)
- University of Notre Dame, IN (United States)
- McGill University, Montreal, QC (Canada)
- Argonne National Laboratory (ANL), Argonne, IL (United States); University of Notre Dame, IN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Manitoba, Winnipeg, MB (Canada)
- Argonne National Lab. (ANL), Argonne, IL (United States); GSI-Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany); Heidelberg Univ. (Germany)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Notre Dame, IN (United States)
- Univ. of Manitoba, Winnipeg, MB (Canada)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Lanzhuo (China)
A nuclear mass survey of rare-earth isotopes has been conducted with the Canadian Penning Trap mass spectrometer using the most neutron-rich nuclei thus far extracted from the CARIBU facility. Here, we present a collection of 12 nuclear masses determined with a precision of ≤ 10 keV/c2 for Z = 58-63 nuclei near N = 100. Independently, a detailed study exploring the role of nuclear masses in the formation of the r-process rare-earth abundance peak has been performed. Employing a Markov chain Monte Carlo (MCMC) technique, mass predictions of lanthanide isotopes have been made which uniquely reproduce the observed solar abundances near A = 164 under three distinct astrophysical outflow conditions. We demonstrate that the mass surface trends thus far mapped out by our measurements are most consistent with MCMC mass predictions given an r process that forms the rare-earth peak during an extended (n, γ) ⇌ (γ, n) equilibrium.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA); Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231; 89233218CNA000001; FG02-02ER41216; FG02-95ER40934; SC0018232; SAPPJ-2015-00034; SAPPJ-2018-00028; DGE-1746045; PHY-1713857; PHY-1630782; PHY-2020275; PHY-1430152
- OSTI ID:
- 1969364
- Alternate ID(s):
- OSTI ID: 2217485
- Report Number(s):
- LA-UR-21-30295; 180921; TRN: US2313597
- Journal Information:
- Physical Review. C, Vol. 105, Issue 5; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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