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


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

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Ministry reporting: Yes

Reporting Year: 2018

JUFO rating: 3

Last updated on 2023-10-01 at 15:41