Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP : Reduced Neutron Pairing and Implications for r-Process Calculations
Vilén, Markus; Kelly, J. M.; Kankainen, Anu; Brodeur, M.; Aprahamian, A.; Canete, Laetitia; Eronen, Tommi; Jokinen, Ari; Kuta, T.; Moore, Iain; Mumpower, M. R.; Nesterenko, Dmitrii; Penttilä, Heikki et al. (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), 262701. DOI: 10.1103/physrevlett.120.262701
Published inPhysical Review Letters
Kuta, T. |
© 2018 American Physical Society
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. ...
PublisherAmerican Physical Society
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Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF
Additional information about fundingThis work has been supported by the Academy of Finland under the Finnish Centre of Excellence Program (Nuclear and Accelerator Based Physics Research at JYFL) and by the National Science Foundation (NSF) Grants No. PHY-1419765 and No. PHY-1713857. A. K., D. A. N., and L. C. acknowledge the support from the Academy of Finland under Projects No. 275389, No. 284516, and No. 312544, and T. E. under Project No. 295207. M. R. M. carried out this work under the auspices of the National Nuclear Security Administration of the U.S. Department of Energy at Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396. R. S.’s work is funded in part by the DOE Office of Science under Contract No. DE-SC0013039. ...
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