β-decay study of the Tz=2 proton-rich nucleus Mg20

L. J. Sun (孙立杰) et al.
Phys. Rev. C 95, 014314 – Published 13 January 2017

Abstract

The β decay of the drip-line nucleus Mg20 gives important information on key astrophysical resonances in Na20, which are relevant to the onset of the rapid proton capture process. A detailed β-decay spectroscopic study of Mg20 was performed by a continuous-implantation method. A detection system was specially developed for charged-particle decay studies, giving improved spectroscopic information including the delayed proton energies, the half-life of Mg20, the excitation energies, the branching ratios, and the logft values for the states in Na20 populated in the β decay of Mg20. A new proton branch was observed and the corresponding excited state in Na20 was proposed. The large isospin asymmetry for the mirror decays of Mg20 and O20 was also well reproduced. To resolve the long-standing problem about the astrophysically interesting 2645 keV resonance in Na20 convincingly, a higher-statistics measurement may still be needed.

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  • Received 19 October 2016

DOI:https://doi.org/10.1103/PhysRevC.95.014314

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 95, Iss. 1 — January 2017

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