Properties of low-lying intruder states in 34Al and 34Si populated in the beta-decay of 34Mg.

The results of the IS530 experiment at ISOLDE revealed new information concerning several nuclei close to the N ≈ 20 'Island of Inversion' - ³⁴Mg, ³⁴Al, ³⁴Si. The half-life of ³⁴Mg was found to be three times larger than the adopted value (63(1) ms instead of 20(10) ms). The beta-gamma spectroscopy of ³⁴Mg performed for the first time in this experiment, led to the first experimental level scheme for ³⁴Al, also showing that the full beta strength goes through the predicted 1+ isomer in ³⁴Al [1] and/or excited states that deexcite to it. The subsequent beta-decay of the 1+ isomer in ³⁴Al allowed the observation of new gamma lines in ³⁴Si, (tentatively) associated with low-spin high-energy excited states previously unobserved. [ABSTRACT FROM AUTHOR]