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Mass measurements of $^{179-184}$Yb identify an anomalous proton-neutron interaction

Fuente: arXiv

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Hauptverfasser:	Brown, C. L., Ash, J., Ashrafkhani, B., Bergmann, J., Brunner, T., Cardona, J. D., Cakirli, R. B., Casten, R. F., Chambers, C., Dickel, T., Gwinner, G., Hockenbery, Z., Jacobs, A., Lassen, J., Li, R., Lunney, D., Kakkar, S., Millán, F. Maldonado, Minkov, N., Mollaebrahimi, A., Lykiardopoulou, E. M., Paul, S., Plaß, W. R., Porter, W. S., Ray, D., Reiter, M. P., Ridley, A., Scheidenberger, C., Simpson, R., Walls, C., Wang, Y., Weaver, A. P., Kwiatkowski, A. A.
Format:	Preprint
Veröffentlicht:	2026
Schlagworte:	Nuclear Experiment Nuclear Theory
Online-Zugang:	Acceder al recurso
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_version_	1866917327703900160
author	Brown, C. L. Ash, J. Ashrafkhani, B. Bergmann, J. Brunner, T. Cardona, J. D. Cakirli, R. B. Casten, R. F. Chambers, C. Dickel, T. Gwinner, G. Hockenbery, Z. Jacobs, A. Lassen, J. Li, R. Lunney, D. Kakkar, S. Millán, F. Maldonado Minkov, N. Mollaebrahimi, A. Lykiardopoulou, E. M. Paul, S. Plaß, W. R. Porter, W. S. Ray, D. Reiter, M. P. Ridley, A. Scheidenberger, C. Simpson, R. Walls, C. Wang, Y. Weaver, A. P. Kwiatkowski, A. A.
author_facet	Brown, C. L. Ash, J. Ashrafkhani, B. Bergmann, J. Brunner, T. Cardona, J. D. Cakirli, R. B. Casten, R. F. Chambers, C. Dickel, T. Gwinner, G. Hockenbery, Z. Jacobs, A. Lassen, J. Li, R. Lunney, D. Kakkar, S. Millán, F. Maldonado Minkov, N. Mollaebrahimi, A. Lykiardopoulou, E. M. Paul, S. Plaß, W. R. Porter, W. S. Ray, D. Reiter, M. P. Ridley, A. Scheidenberger, C. Simpson, R. Walls, C. Wang, Y. Weaver, A. P. Kwiatkowski, A. A.
contents	Mass measurements of nuclei can identify structurally-driven trends in binding energy across isotopic chains, and can also isolate specific nucleon-nucleon interactions, such as the $δV_{\mathrm{pn}}$ interaction of the last two valence protons with the last two valence neutrons. Below $^{208}$Pb, investigation of the local binding energy and $δV_{\mathrm{pn}}$ systematics can facilitate a better understanding of the behaviour of the proton-neutron interaction in the 'hole-hole' regime (where valence interactions can be modelled in hole-space rather than particle-space) and provide insight on the potential onset of a prolate-to-oblate shape transition. However, measurement of the necessary nuclei has been exceptionally challenging. Here we present six first-time measurements of neutron-rich ytterbium, using advanced rare isotope production and mass spectrometry techniques, leading to the identification of an anomalously strong proton-neutron interaction in the 'hole-hole' quadrant below $^{208}$Pb. The scale of this interaction, at $^{186}$Hf, is comparable to that of similar signals at doubly-magic nuclei and shape transitions. The experimental results are compared with contemporary mean-field model predictions, that do not accurately reproduce the anomaly. The results are also used to benchmark predictions from several models, to facilitate more accurate descriptions towards a key r-process waiting point at $N = 126$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2603_08908
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Mass measurements of $^{179-184}$Yb identify an anomalous proton-neutron interaction Brown, C. L. Ash, J. Ashrafkhani, B. Bergmann, J. Brunner, T. Cardona, J. D. Cakirli, R. B. Casten, R. F. Chambers, C. Dickel, T. Gwinner, G. Hockenbery, Z. Jacobs, A. Lassen, J. Li, R. Lunney, D. Kakkar, S. Millán, F. Maldonado Minkov, N. Mollaebrahimi, A. Lykiardopoulou, E. M. Paul, S. Plaß, W. R. Porter, W. S. Ray, D. Reiter, M. P. Ridley, A. Scheidenberger, C. Simpson, R. Walls, C. Wang, Y. Weaver, A. P. Kwiatkowski, A. A. Nuclear Experiment Nuclear Theory Mass measurements of nuclei can identify structurally-driven trends in binding energy across isotopic chains, and can also isolate specific nucleon-nucleon interactions, such as the $δV_{\mathrm{pn}}$ interaction of the last two valence protons with the last two valence neutrons. Below $^{208}$Pb, investigation of the local binding energy and $δV_{\mathrm{pn}}$ systematics can facilitate a better understanding of the behaviour of the proton-neutron interaction in the 'hole-hole' regime (where valence interactions can be modelled in hole-space rather than particle-space) and provide insight on the potential onset of a prolate-to-oblate shape transition. However, measurement of the necessary nuclei has been exceptionally challenging. Here we present six first-time measurements of neutron-rich ytterbium, using advanced rare isotope production and mass spectrometry techniques, leading to the identification of an anomalously strong proton-neutron interaction in the 'hole-hole' quadrant below $^{208}$Pb. The scale of this interaction, at $^{186}$Hf, is comparable to that of similar signals at doubly-magic nuclei and shape transitions. The experimental results are compared with contemporary mean-field model predictions, that do not accurately reproduce the anomaly. The results are also used to benchmark predictions from several models, to facilitate more accurate descriptions towards a key r-process waiting point at $N = 126$.
title	Mass measurements of $^{179-184}$Yb identify an anomalous proton-neutron interaction
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2603.08908