$\beta$-decay of $^{33}$-$^{35}$Mg near the island of inversion
ORAL
Abstract
$^{31-35}$Mg nuclei lie in or around the island of inversion near the $N=20$ shell closure. These nuclei exhibit a peculiar behavior with their ground states (gs) dominated by deformed configurations. The daughter nuclei $^{31-35}$Al are suggested to have mixed gs configurations of normal and intruder type and thus serve as a transition from intruder dominated Mg isotopes to the normal gs configuration in Si isotopes. An experiment was performed in the ISAC-I facility at TRIUMF with the goal of populating states in $^{33-35}$Al via the beta decay of $^{33-35}$Mg. 500MeV protons on a UC$_{x}$ target with laser-ionization produced pure beams of Mg ions, which were then implanted on a moving Mylar tape at the center of the 8$\pi$ facility. Surrounding the implantation point was a set of 11 plastic scintillators used for beta tagging and 20 Compton-suppressed HPGe detectors for gamma-spectroscopy. First results from this experiment will be presented. The level schemes produced for states in $^{33,34}$Al will be compared to shell model calculations to understand the influence of intruder states in the neutron-rich $^{33-35}$Al isotopes. Additionally, disagreements between previous experimental results of $^{33}$Mg and $^{33}$Al will be discussed.
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Authors
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Mustafa Rajabali
TRIUMF, Vancouver BC, Canada