Mass measurements with a relative precision of better than 1.5×10-8 were performed on 22Mg and its reaction partners 21Na and 22Na with the ISOLTRAP Penning trap mass spectrometer at CERN, yielding the mass excesses D(22Mg)=-399.92(27) keV, D(21Na)=-2184.71(21) keV, and D(22Na)=-5181.56(16) keV. The importance of these results is twofold. First, a comparative half-life (Ft value) has been obtained for the superallowed β decay of 22Mg to further test the conserved-vector-current hypothesis. Second, the resonance energy for the 21Na proton capture reaction has been independently determined, allowing direct comparisons of observable γ radiation in nova explosions with the yield expected from models.
Physical Review Letters
- Pub Date:
- October 2004
- Binding energies and masses;
- Weak-interaction and lepton aspects;
- Nucleosynthesis in novae supernovae and other explosive environments;