Re-examining the transition into the N = 20 island of inversion: Structure of 30Mg

Abstract

Intermediate energy single-neutron removal from 31Mg has been employed to investigate the transition into the N=20island of inversion. Levels up to 5MeV excitation energy in 30Mg were populated and spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and γ-ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors to be deduced. Surprisingly, the 0+2level in 30Mg was found to have a strength much weaker than expected in the conventional picture of a predominantly 2p−2hintruder configuration having a large overlap with the deformed 31Mg ground state. In addition, negative parity levels were identified for the first time in 30Mg, one of which is located at low excitation energy. The results are discussed in the light of shell-model calculations employing two newly developed approaches with markedly different descriptions of the structure of 30Mg. It is concluded that the cross-shell effects in the region of the island of inversion at Z=12are considerably more complex than previously thought and that np−nhconfigurations play a major role in the structure of 30Mg.