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Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for r-Process Calculations.
Vilen, M; Kelly, J M; Kankainen, A; Brodeur, M; Aprahamian, A; Canete, L; Eronen, T; Jokinen, A; Kuta, T; Moore, I D; Mumpower, M R; Nesterenko, D A; Penttilä, H; Pohjalainen, I; Porter, W S; Rinta-Antila, S; Surman, R; Voss, A; Äystö, J.
Affiliation
  • Vilen M; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Kelly JM; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Kankainen A; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Brodeur M; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Aprahamian A; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Canete L; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Eronen T; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Jokinen A; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Kuta T; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Moore ID; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Mumpower MR; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Nesterenko DA; Theory Division, Los Alamos National Lab, Los Alamos, New Mexico 87544, USA.
  • Penttilä H; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Pohjalainen I; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Porter WS; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Rinta-Antila S; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Surman R; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
  • Voss A; University of Notre Dame, Notre Dame, Indiana 46556, USA.
  • Äystö J; University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
Phys Rev Lett ; 120(26): 262701, 2018 Jun 29.
Article in En | MEDLINE | ID: mdl-30004755
ABSTRACT
The rare-earth peak in the r-process abundance pattern depends sensitively on both the astrophysical conditions and subtle changes in nuclear structure in the region. This work takes an important step towards elucidating the nuclear structure and reducing the uncertainties in r-process calculations via precise atomic mass measurements at the JYFLTRAP double Penning trap. ^{158}Nd, ^{160}Pm, ^{162}Sm, and ^{164-166}Gd have been measured for the first time, and the precisions for ^{156}Nd, ^{158}Pm, ^{162,163}Eu, ^{163}Gd, and ^{164}Tb have been improved considerably. Nuclear structure has been probed via two-neutron separation energies S_{2n} and neutron pairing energy metrics D_{n}. The data do not support the existence of a subshell closure at N=100. Neutron pairing has been found to be weaker than predicted by theoretical mass models. The impact on the calculated r-process abundances has been studied. Substantial changes resulting in a smoother abundance distribution and a better agreement with the solar r-process abundances are observed.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article
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Print
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PubMed Links
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article