Cuadro de texto:   -  Atomic Mass: 221.0154550 ± 0.0001080 amu -  Excess Mass: 14396.000 ± 100.000 keV -  Binding Energy: 1702084.000 ± 100.000 keV -  Beta Decay Energy: B- 1127.000 ± 100.000 keV -  Spin: 7/2(+) -  Half life: 25 min -  Mode of decay: Beta to Fr-221 º  Branch ratio: 78.00 % º  Decay energy: 1.220 MeV -  Mode of decay: Alpha to Po-217 º  Branch ratio: 22.00 % º  Decay energy: 6.146 MeV

 

 

 

 

 

 

 

 

 

 

 

 

 

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