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 editorsVilén, Markus; Kelly, J. M.; Kankainen, Anu; Brodeur, M.; Aprahamian, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kuta, T.; Moore, Iain; et al.

Journal or seriesPhysical Review Letters

ISSN0031-9007

eISSN1079-7114

Publication year2018

Volume120

Issue number26

Article number262701

PublisherAmerican Physical Society

Publication countryUnited States

Publication languageEnglish

DOIhttps://doi.org/10.1103/physrevlett.120.262701

Publication open accessOther 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 availablehttps://arxiv.org/abs/1801.08940

Additional informationErratum: 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.


Keywordsnuclear physicsastrophysicsrare earth metals

Free keywordsbinding energy and masses; nuclear astrophysics


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Ministry reportingYes

Reporting Year2018

JUFO rating3


Last updated on 2024-08-01 at 20:46