New Nuclides Na19 and Al23 Observed Via The (p,He6) reaction
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By employing the reactions Mg24(p,He6)Na19 and Si28(p,He6)Al23 [dd100 nb/sr], the mass excesses of Na19 and Al23 are found to be 12.974 0.070 and 6.766 0.080 MeV, respectively [C12 = 0]. Since Na19 is determined to be proton unstable, Al23 should be the lightest, nucleon-stable member of the A=4n+3, TZ=-32 mass series. 1969 The American Physical Society.