A contour plot of the nuclear potential energy surface for ⁷²Kr along with the shapes corresponding to the marked points which include two minima: the ground state (blue) and a metastable state (green).

From the article:

Global Calculation of Nuclear Shape Isomers
Peter Möller, Arnold J. Sierk, Ragnar Bengtsson, Hiroyuki Sagawa, and Takatoshi Ichikawa
Phys. Rev. Lett. 103, 212501 (2009)

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