Beta-decay study of $T_z=-2$ proton-rich nucleus $^{20}$Mg

10 Oct 2016 · Sun L. J., Xu X. X., Lin C. J., Wang J. S., Fang D. Q., Li Z. H., Wang Y. T., Li J., Yang L., Ma N. R., Wang K., Zang H. L., Wang H. W., Li C., Shi C. Z., Nie M. W., Li X. F., Li H., Ma J. B., Ma P., Jin S. L., Huang M. R., Bai Z., Wang J. G., Yang F., Jia H. M., Zhang H. Q., Liu Z. H., Bao P. F., Wang D. X., Ma Y. G., Yang Y. Y., Zhou Y. J., Ma W. H., Chen J. ·

The $\beta$ decay of the drip-line nucleus $^{20}$Mg gives important information on resonances in $^{20}$Na, which are relevant for the astrophysical $rp$-process. A detailed $\beta$ decay spectroscopic study of $^{20}$Mg 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 $^{20}$Mg, the excitation energies, the branching ratios, and the log $ft$ values for the states in $^{20}$Na populated in the $\beta$ decay of $^{20}$Mg. A new proton branch was observed and the corresponding excited state in $^{20}$Na was proposed. The large isospin asymmetry for the mirror decays of $^{20}$Mg and $^{20}$O was reproduced, as well. However, no conclusive conclusion can be draw about the astrophysically interesting 2645~keV resonance in $^{20}$Na due to the limited statistics.

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Beta-decay study of $T_z=-2$ proton-rich nucleus $^{20}$Mg

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