Shape coexistence near the neutron number N=20: First identification of the E0 decay from the deformed 0+2 state in 30Mg
Abstract
The 1789 keV level in 30Mg was identified as the first excited 0+ state by measuring its E0 transition to the ground state. The measured small value of rho2(E0,0+2 --> 0+1) = 5.7(14) x 10-3 implies a very small mixing of competing configurations with largely different intrinsic quadrupole deformation near N=20. Axially symmetric Beyond-Mean-Field configuration mixing calculations identify the ground state of 30Mg to be based on neutron configurations below the N=20 shell closure, while the excited 0+ state mainly consists of a two neutrons excitated into the nu1 f7/2 orbital. Using a two-level model, a mixing amplitude of 0.08(4) can be derived.
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