Prominent bump in the two-neutron separation energies of neutron-rich lanthanum isotopes revealed by high-precision mass spectrometry
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2024
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| author | Jaries, A. Stryjczyk, M. Kankainen, A. Eronen, T. Beliuskina, O. Dickel, T. Flayol, M. Ge, Z. Hukkanen, M. Mougeot, M. Nikas, S. Pohjalainen, I. Raggio, A. Reponen, M. Ruotsalainen, J. Virtanen, V. |
| author_facet | Jaries, A. Stryjczyk, M. Kankainen, A. Eronen, T. Beliuskina, O. Dickel, T. Flayol, M. Ge, Z. Hukkanen, M. Mougeot, M. Nikas, S. Pohjalainen, I. Raggio, A. Reponen, M. Ruotsalainen, J. Virtanen, V. |
| contents | We report on high-precision atomic mass measurements of $^{148\text{-}153}$La and $^{151}$Ce performed with the JYFLTRAP double Penning trap using the Phase-Imaging Ion-Cyclotron-Resonance technique. The masses of $^{152,153}$La were experimentally determined for the first time. We confirm the sharp kink in the two-neutron separation energies at the neutron number ${N=93}$ in the cerium (${Z=58}$) isotopic chain. Our precision mass measurements of the most exotic neutron-rich lanthanum (${Z=57}$) isotopes reveal a sudden increase in two-neutron separation energies from ${N=92}$ to ${N=93}$. Unlike in the cerium isotopic chain, the kink is not sharp but extends to ${N=94}$ forming a prominent bump. The gain in energy is about 0.4 MeV, making it one of the strongest changes in two-neutron separation energies over the whole chart of nuclides, away from nuclear shell closures. The results call for further studies to elucidate the structure of neutron-rich lanthanum isotopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06221 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Prominent bump in the two-neutron separation energies of neutron-rich lanthanum isotopes revealed by high-precision mass spectrometry Jaries, A. Stryjczyk, M. Kankainen, A. Eronen, T. Beliuskina, O. Dickel, T. Flayol, M. Ge, Z. Hukkanen, M. Mougeot, M. Nikas, S. Pohjalainen, I. Raggio, A. Reponen, M. Ruotsalainen, J. Virtanen, V. Nuclear Experiment Nuclear Theory We report on high-precision atomic mass measurements of $^{148\text{-}153}$La and $^{151}$Ce performed with the JYFLTRAP double Penning trap using the Phase-Imaging Ion-Cyclotron-Resonance technique. The masses of $^{152,153}$La were experimentally determined for the first time. We confirm the sharp kink in the two-neutron separation energies at the neutron number ${N=93}$ in the cerium (${Z=58}$) isotopic chain. Our precision mass measurements of the most exotic neutron-rich lanthanum (${Z=57}$) isotopes reveal a sudden increase in two-neutron separation energies from ${N=92}$ to ${N=93}$. Unlike in the cerium isotopic chain, the kink is not sharp but extends to ${N=94}$ forming a prominent bump. The gain in energy is about 0.4 MeV, making it one of the strongest changes in two-neutron separation energies over the whole chart of nuclides, away from nuclear shell closures. The results call for further studies to elucidate the structure of neutron-rich lanthanum isotopes. |
| title | Prominent bump in the two-neutron separation energies of neutron-rich lanthanum isotopes revealed by high-precision mass spectrometry |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2408.06221 |