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The 1789 keV level in 30Mg was identified as the first excited 0^+ state bymeasuring its E0 transition to the ground state. The measured small value ofrho^2(E0,0^+_2 --> 0^+_1) = 5.7(14) x 10^-3 implies a very small mixing ofcompeting configurations with largely different intrinsic quadrupoledeformation near N=20. Axially symmetric Beyond-Mean-Field configuration mixingcalculations identify the ground state of 30Mg to be based on neutronconfigurations below the N=20 shell closure, while the excited 0^+ state mainlyconsists of a two neutrons excitated into the nu1 f_{7/2} orbital. Using atwo-level model, a mixing amplitude of 0.08(4) can be derived.

Shape coexistence near the neutron number N=20: First identification of the E0 decay from the deformed 0^+_2 state in 30Mg