Decays of the Tz=-2 nuclei 20Mg, 24Si, and 36Ca

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Scientific paper

Beta-delayed protons have been observed from the decays of the mass separated Tz=-2 nuclides 20Mg, 24Si, and 36Ca. From these proton spectra the mass excesses of the lowest T=2 states in the Tz=-1 nuclei 20Na, 24Al, and 36K are determined to be 13420+/-50 keV (20Na), 5903+/-9 keV (24Al), and - 13168+/-22 keV (36K). The complete A=20, 24, and 36 isospin quintets have all their members bound against isospin allowed particle-decay modes, providing a stringent test of the isobaric multiplet mass equation. Good agreement is observed for all these quintets using only the quadratic form of this equation. RADIOACTIVITY 20Mg, 24Si, 36Ca (mass separated); measured β-delayed protons; deduced T12 and proton branching; derived mass excesses of the lowest 0+, T=2 states in 20Na, 24Al, and 36K; deduced coefficients of the isobaric multiplet mass equation.

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