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
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arXiv
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| Format: | Preprint |
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2024
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| author | 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. |
| author_facet | 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. |
| contents | 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 $^{169}$Tb, $^{170}$Dy and $^{171}$Dy, as well as the first high-precision mass measurements of $^{169}$Dy and $^{169\text{-}171}$Ho. For $^{170}$Ho, the two long-lived ground and isomeric states were resolved and their mass measured, yielding an isomer excitation energy of $E_\text{exc}=150.8(54)$~keV. In addition, we have performed independent crosschecks of previous Penning-trap values obtained for $^{167\text{,} 168}$Tb and $^{167\text{,} 168}$Dy. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_08511 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | 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 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. Nuclear Experiment 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 $^{169}$Tb, $^{170}$Dy and $^{171}$Dy, as well as the first high-precision mass measurements of $^{169}$Dy and $^{169\text{-}171}$Ho. For $^{170}$Ho, the two long-lived ground and isomeric states were resolved and their mass measured, yielding an isomer excitation energy of $E_\text{exc}=150.8(54)$~keV. In addition, we have performed independent crosschecks of previous Penning-trap values obtained for $^{167\text{,} 168}$Tb and $^{167\text{,} 168}$Dy. 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. |
| title | 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 |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2405.08511 |