Experimental study of nuclei near N=20 study of 32,31Na, 31Mg, 33,34Al beta decay

The experimental results obtained at the ISOLDE on-line separator concerning n-rich Na, Mg and Al isotopes are reported. The isotopes are produced by bombarding a uranium carbide target with the 600MeV proton beam at CERN synchrocyclotron and are ionized in a tungsten surface ionization source. The aim of the investigation was to delineate the region of deformation where properties could not be described by the sd shell model calculations and to locate intruder states for which 1(h/2π)ω or 2(h/2π)ω excitation from sd to fp shells are found lower than 0(h/2π)ω excitation