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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). [Peter Möller, Arnold J. Sierk, Ragnar Bengtsson, Hiroyuki Sagawa, and Takatoshi Ichikawa, Phys. Rev. Lett. 103, 212501 (2009)] |


