LICĂ, R.; ROTARU, F.; BORGE, M.J.G.; GRÉVY, S.; NEGOIŢĂ, F.; POVES, A.; SORLIN, O.; ANDREYEV, A.N.; BORCEA, R.; COSTACHE, C.; DE WITTE, H.; FRAILE, L.M.; GREENLEES, P.T.; HUYSE, M.; IONESCU, A.; KISYOV, S.; KONKI, J.; LAZARUS, I.; MADURGA, M.; MĂRGINEAN, N.; MĂRGINEAN, R.; MIHAI, C.; MIHAI, R.E.; NEGRET, A.; PAGE, R.D.; PAKARINEN, J.; PASCU, S.; PUCKNELL, V.; RAHKILA, P.; RAPISARDA, E.; ŞERBAN, A.; SOTTY, C.O.; STAN, L.; STĂNOIU, M.; TENGBLAD, O.; TURTURICĂ, A.; VAN DUPPEN, P.; WADSWORTH, R.; WARR, N.

doi:10.1103/PhysRevC.95.021301

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Phys.Rev.C. 2017, vol. 95, n° 2, p. 021301

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The β− decay of Mg34 was used to study the Al34 nucleus through γ spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two β-decaying states in Al34 having spin-parity assignments Jπ=4− dominated by the normal configuration π(d5/2)−1⊗ν(f7/2) and Jπ=1+ by the intruder configuration π(d5/2)−1⊗ν(d3/2)−1(f7/2)2. Their unknown ordering and relative energy have been the subject of debate for the placement of Al34 inside or outside the N=20 “island of inversion.” We report here that the 1+ intruder lies only 46.6 keV above the 4− ground state. In addition, a new half-life of T1/2=44.9(4)ms, that is twice as long as the previously measured 20(10) ms, has been determined for Mg34. Large-scale shell-model calculations with the recently developed sdpf-u-mix interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the N=20 island of inversion.< Réduire

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Identification of the crossing point at $N=21$ between normal and intruder configurations

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