Beta-decay study of Tz=-2 proton-rich nucleus 20Mg
Abstract
The β decay of the drip-line nucleus 20Mg gives important information on resonances in 20Na, which are relevant for the astrophysical rp-process. A detailed β decay spectroscopic study of 20Mg was performed by a continuous-implantation method. A detection system was specially developed for charged-particle decay studies, giving improved spectroscopic information including the half-life of 20Mg, the excitation energies, the branching ratios, and the log ft values for the states in 20Na populated in the β decay of 20Mg. A new proton branch was observed and the corresponding excited state in 20Na was proposed. The large isospin asymmetry for the mirror decays of 20Mg and 20O was reproduced, as well. However, no conclusive conclusion can be draw about the astrophysically interesting 2645~keV resonance in 20Na due to the limited statistics.
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