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

AutorLica, R.; Rotaru, F.; García Borge, María José ; Grévy, S.; Poves, Alfredo ; Fraile, Luis M. ; Madurga, M.; Tengblad, Olof ; Warr, N.
Fecha de publicación9-feb-2017
EditorAmerican Physical Society
CitaciónPhysical Review C 95: 021301(R) (2017)
ResumenThe 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.
DescripciónR. Lica et al. -- 6 pags., 3 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0
Versión del editorhttps://doi.org/10.1103/PhysRevC.95.021301
Identificadoresdoi: 10.1103/PhysRevC.95.021301
issn: 2469-9993
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