A1 Journal article (refereed)
Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP : Reduced Neutron Pairing and Implications for r-Process Calculations (2018)
Vilén, M., Kelly, J. M., Kankainen, A., Brodeur, M., Aprahamian, A., Canete, L., Eronen, T., Jokinen, A., Kuta, T., Moore, I., Mumpower, M. R., Nesterenko, D., Penttilä, H., Pohjalainen, I., Porter, W. S., Rinta-Antila, S., Surman, R., Voss, A., & Äystö, J. (2018). Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP : Reduced Neutron Pairing and Implications for r-Process Calculations. Physical Review Letters, 120(26), Article 262701. https://doi.org/10.1103/physrevlett.120.262701
JYU authors or editors
Publication details
All authors or editors: Vilén, Markus; Kelly, J. M.; Kankainen, Anu; Brodeur, M.; Aprahamian, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kuta, T.; Moore, Iain; et al.
Journal or series: Physical Review Letters
ISSN: 0031-9007
eISSN: 1079-7114
Publication year: 2018
Volume: 120
Issue number: 26
Article number: 262701
Publisher: American Physical Society
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1103/physrevlett.120.262701
Publication open access: Other way freely accessible online
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/58887
Web address where publication is available: https://arxiv.org/abs/1801.08940
Additional information: Erratum: Vilen, M., Kelly, J.M., Kankainen, A. et al. Phys. Rev. Lett. 124, 129901 (2020)
DOI: https://doi.org/10.1103/PhysRevLett.124.129901
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. Nd158, Pm160, Sm162, and Gd164-166 have been measured for the first time, and the precisions for Nd156, Pm158, Eu162,163, Gd163, and Tb164 have been improved considerably. Nuclear structure has been probed via two-neutron separation energies S2n and neutron pairing energy metrics Dn. 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.
Keywords: nuclear physics; astrophysics; rare earth metals
Free keywords: binding energy and masses; nuclear astrophysics
Contributing organizations
Related projects
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- Kankainen, Anu
- Research Council of Finland
- Studies of exotic nuclei for understanding the origin of elements in the Universe
- Kankainen, Anu
- Research Council of Finland
- Studies of exotic nuclei for understanding the origin of elements in the Universe
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- Research Council of Finland
- Tarkkuusmassamittauksia eitttäin matalien Q-arvojen määrittämiseksi mahdollistaa kandidaattiytimistä neutriinojen tutkimiseen
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- Research Council of Finland
Ministry reporting: Yes
Reporting Year: 2018
JUFO rating: 3