Investigating nuclear structure near $N=32$ and $N=34$: Precision mass measurements of neutron-rich Ca, Ti and V isotopes

Abstract

Nuclear mass measurements of isotopes are key to improving our understanding of nuclear structure across the chart of nuclides, in particular for the determination of the appearance or disappearance of nuclear shell closures. We present high-precision mass measurements of neutron-rich Ca, Ti and V isotopes performed at the TITAN and LEBIT facilities. These measurements were made using the TITAN multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS) and the LEBIT 9.4T Penning trap mass spectrometer. In total, 13 masses were measured, eight of which represent increases in precision over previous measurements. These measurements refine trends in the mass surface around $N=32$ and $N=34$, and support the disappearance of the $N=32$ shell closure with increasing proton number. Additionally, our data does not support the presence of a shell closure at $N=34$.

arXiv comment8 pages, 6 figures

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• High Precision Binding Energies from Physics Informed Machine Learning
• Potential signature of new magicity from universal aspects of nuclear charge radii
• Universal Effective Charges in the $sd$ and $fp$ Shells
• Further exploration of binding energy residuals using machine learning and the development of a composite ensemble model