Extreme shape coexistence observed in 70Co
| Title: | Extreme shape coexistence observed in 70Co |
|---|---|
| Authors: | Cade Dembski, Artemis Spyrou, B. Alex Brown, Sean N. Liddick, Hannah C. Berg, Darren L. Bleuel, Katherine Childers, Benjamin P. Crider, Alexander C. Dombos, Erin C. Good, Caley Harris, Ann-Cecilie Larsen, Rebecca Lewis, Stephanie Lyons, Alicia Palmisano-Kyle, Jorge Pereira, Andrea L. Richard, Debra Richman, Nicholas Scielzo, Anna Simon, Mallory K. Smith, Chris Sullivan, Adriana Sweet, Antonius Torode, Remco Zegers |
| Source: | Communications Physics, Vol 8, Iss 1, Pp 1-10 (2025) |
| Publisher Information: | Nature Portfolio, 2025. |
| Publication Year: | 2025 |
| Collection: | LCC:Astrophysics LCC:Physics |
| Subject Terms: | Astrophysics, QB460-466, Physics, QC1-999 |
| More Details: | Abstract The shape of the atomic nucleus is a property that 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 the 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 70Co, 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. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2399-3650 |
| Relation: | https://doaj.org/toc/2399-3650 |
| DOI: | 10.1038/s42005-025-01998-2 |
| Access URL: | https://doaj.org/article/ca1683b2c316497689da508cb6091a26 |
| Accession Number: | edsdoj.1683b2c316497689da508cb6091a26 |
| Database: | Directory of Open Access Journals |
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