Extreme Shape Coexistence Observed in $^{70}$Co
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Dembski, Cade Spyrou, Artemis Brown, B. Alex Liddick, Sean N. Berg, Hannah C. Bleuel, Darren L. Childers, Katherine Crider, Benjamin P. Dombos, Alexander C. Good, Erin C. Harris, Caley Larsen, Ann-Cecilie Lewis, Rebecca Lyons, Stephanie Palmisano-Kyle, Alicia Pereira, Jorge Richard, Andrea L. Richman, Debra Scielzo, Nicholas Simon, Anna Smith, Mallory K. Sullivan, Chris Sweet, Adriana Torode, Antonius Zegers, Remco |
| author_facet | Dembski, Cade Spyrou, Artemis Brown, B. Alex Liddick, Sean N. Berg, Hannah C. Bleuel, Darren L. Childers, Katherine Crider, Benjamin P. Dombos, Alexander C. Good, Erin C. Harris, Caley Larsen, Ann-Cecilie Lewis, Rebecca Lyons, Stephanie Palmisano-Kyle, Alicia Pereira, Jorge Richard, Andrea L. Richman, Debra Scielzo, Nicholas Simon, Anna Smith, Mallory K. Sullivan, Chris Sweet, Adriana Torode, Antonius Zegers, Remco |
| contents | The shape of the atomic nucleus is a property which underpins our understanding of nuclear systems, impacts the limits of nuclear existence, and enables probes of physics beyond the Standard Model. Nuclei can adopt a variety of shapes, including spheres, axially deformed spheroids, and pear shapes. In some regions of the nuclear chart where a spherical nucleus would naively be expected, deformed nuclear states can result from collective action of constituent protons and neutrons. In a small subset of nuclei both spherical and deformed nuclear states have been experimentally observed, a phenomenon termed shape coexistence. We present spectroscopic evidence for the coexistence of $J^π=1+$ spherical and deformed states in $^{70}$Co, separated by less than 275~keV. This close degeneracy of levels with the same $J^π$ and different shapes demonstrates an extreme example of shape coexistence resulting from the interplay of independent particle motion and collective behavior in highly unstable nuclear systems and identifies the Co isotopes as a transition point between deformed ground states observed in the Cr isotopes and spherical configurations observed in the closed-shell Ni isotopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_12681 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extreme Shape Coexistence Observed in $^{70}$Co Dembski, Cade Spyrou, Artemis Brown, B. Alex Liddick, Sean N. Berg, Hannah C. Bleuel, Darren L. Childers, Katherine Crider, Benjamin P. Dombos, Alexander C. Good, Erin C. Harris, Caley Larsen, Ann-Cecilie Lewis, Rebecca Lyons, Stephanie Palmisano-Kyle, Alicia Pereira, Jorge Richard, Andrea L. Richman, Debra Scielzo, Nicholas Simon, Anna Smith, Mallory K. Sullivan, Chris Sweet, Adriana Torode, Antonius Zegers, Remco Nuclear Experiment Nuclear Theory The shape of the atomic nucleus is a property which underpins our understanding of nuclear systems, impacts the limits of nuclear existence, and enables probes of physics beyond the Standard Model. Nuclei can adopt a variety of shapes, including spheres, axially deformed spheroids, and pear shapes. In some regions of the nuclear chart where a spherical nucleus would naively be expected, deformed nuclear states can result from collective action of constituent protons and neutrons. In a small subset of nuclei both spherical and deformed nuclear states have been experimentally observed, a phenomenon termed shape coexistence. We present spectroscopic evidence for the coexistence of $J^π=1+$ spherical and deformed states in $^{70}$Co, separated by less than 275~keV. This close degeneracy of levels with the same $J^π$ and different shapes demonstrates an extreme example of shape coexistence resulting from the interplay of independent particle motion and collective behavior in highly unstable nuclear systems and identifies the Co isotopes as a transition point between deformed ground states observed in the Cr isotopes and spherical configurations observed in the closed-shell Ni isotopes. |
| title | Extreme Shape Coexistence Observed in $^{70}$Co |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2502.12681 |