12-Mg-21
 basic

 element
12-magnesium-21

  • Atomic Mass: 21.0117142 +- 0.0000176 amu
  • Excess Mass: 10911.681 +- 16.416 keV
  • Binding Energy: 149197.857 +- 16.416 keV
  • Beta Decay Energy: B- -15207.000 +- 299.000 keV #
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
  • Spin: /2,5/2)+
  • Half life: 122 ms
  • Mode of decay: Electron capture to Na-21
    • Decay energy: 13.096 MeV
  • Mode of decay: EC + Proton to Ne-20
    • Branch ratio: 29.30 %
    • Decay energy: 10.665 MeV

  • Possible parent nuclides:
    EC + P from Si-22
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)