Extreme shape coexistence observed in 70Co

被引：0

作者：

Dembski, Cade ^{[1
,2
]}

Spyrou, Artemis ^{[1
,3
]}

Brown, B. Alex ^{[1
,3
]}

Liddick, Sean N. ^{[1
,4
]}

Berg, Hannah C. ^{[1
,3
]}

Bleuel, Darren L. ^{[5
]}

Childers, Katherine ^{[1
,4
]}

Crider, Benjamin P. ^{[6
]}

Dombos, Alexander C. ^{[1
,3
]}

Good, Erin C. ^{[7
]}

Harris, Caley ^{[1
,3
]}

Larsen, Ann-Cecilie ^{[8
]}

Lewis, Rebecca ^{[1
,4
]}

Lyons, Stephanie ^{[7
]}

Palmisano-Kyle, Alicia ^{[9
]}

Pereira, Jorge ^{[1
]}

Richard, Andrea L. ^{[1
,10
]}

Richman, Debra ^{[1
]}

Scielzo, Nicholas ^{[5
]}

Simon, Anna ^{[2
]}

Smith, Mallory K. ^{[1
]}

Sullivan, Chris ^{[1
,3
]}

Sweet, Adriana ^{[5
]}

Torode, Antonius ^{[1
,3
,11
]}

Zegers, Remco ^{[1
,3
]}

机构：

[1] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA

[2] Univ Notre Dame, Dept Phys & Astron, Notre Dame, IN 46556 USA

[3] Michigan State Univ, Dept Phys & Astron, E Lansing, MI USA

[4] Michigan State Univ, Dept Chem, E Lansing, MI USA

[5] Lawrence Livermore Natl Lab, Livermore, CA USA

[6] Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA

[7] Pacific Northwest Natl Lab, Richland, WA USA

[8] Univ Oslo, Dept Phys, Oslo, Norway

[9] Univ Tennessee, Dept Nucl Engn, Knoxville, TN USA

[10] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

[11] Univ Texas Austin, Appl Res Labs, Austin, TX USA

来源：

COMMUNICATIONS PHYSICS | 2025年 / 8卷 / 01期

基金：

美国国家科学基金会;

关键词：

SHELL EVOLUTION; BETA-DECAY; MODEL; STATES;

D O I：

10.1038/s42005-025-01998-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 pi = 1+ spherical and deformed states in 70Co, separated by less than 275 keV. This close degeneracy of levels with the same J pi 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.

引用

页数：10

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