A1 Journal article (refereed)
Probing the 𝑁=104 midshell region for the 𝑟 process via precision mass spectrometry of neutron-rich rare-earth isotopes with the JYFLTRAP double Penning trap (2024)

Jaries, A., Nikas, S., Kankainen, A., Eronen, T., Beliuskina, O., Dickel, T., Flayol, M., Ge, Z., Hukkanen, M., Mougeot, M., Pohjalainen, I., Raggio, A., Reponen, M., Ruotsalainen, J., Stryjczyk, M., & Virtanen, V. (2024). Probing the 𝑁=104 midshell region for the 𝑟 process via precision mass spectrometry of neutron-rich rare-earth isotopes with the JYFLTRAP double Penning trap. Physical Review C, 110(4), Article 045809. https://doi.org/10.1103/PhysRevC.110.045809

JYU authors or editors

Publication details

All authors or editors: Jaries, A.; Nikas, S.; Kankainen, A.; Eronen, T.; Beliuskina, O.; Dickel, T.; Flayol, M.; Ge, Z.; Hukkanen, M.; Mougeot, M.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2024

Publication date: 21/10/2024

Volume: 110

Issue number: 4

Article number: 045809

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.110.045809

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/99556

Web address of parallel published publication (pre-print):  https://doi.org/10.48550/arXiv.2405.08511

Abstract

We have performed high-precision mass measurements of neutron-rich rare-earth Tb, Dy and Ho isotopes using the Phase-Imaging Ion-Cyclotron-Resonance technique at the JYFLTRAP double Penning trap. We report on the first experimentally determined mass values for 169Tb, 170Dy and 171Dy, as well as the first high-precision mass measurements of 169Dy and 169-171Ho. For 170Ho, the two long-lived ground and isomeric states were resolved and their mass measured, yielding an isomer excitation energy of Eexc=150.8(54)~keV. In addition, we have performed independent crosschecks of previous Penning-trap values obtained for 167,168Tb and 167,168Dy. We have extended the systematics of two-neutron separation energies to the neutron midshell at N=104 in all of the studied isotopic chains. Our updated and new mass measurements provide better mass-related constraints for the neutron-capture reaction rates relevant to the astrophysical rapid neutron capture (r) process. The r-process abundances calculated with the new mass values seem to produce a steeper minimum at A=170 and differ by around 15-30\% from the abundances computed with the Atomic Mass Evaluation 2020 values.

Keywords: nuclear physics; particle physics

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Ministry reporting: Yes

VIRTA submission year: 2024

Preliminary JUFO rating: 2