Isotopes of Francium (Z=87)

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Isotope Half-life Spin Parity Decay Mode(s) or Abundance
200Fr 19 ms (3+) %A=100
200m1Fr 0.57 s (10-) %A=100
201Fr 48 ms (9/2-) %A=100 , %EC+%B+ < 1
202Fr 0.34 s (3+) %A ~ 97 , %EC+%B+ ~ 3
202m1Fr 0.34 s (10-) %A ~ 97 , %EC+%B+ ~ 3
203Fr 0.55 s(9/2-) %A ~ 95 , %EC+%B+ ~ 5
204Fr 1.7 s (3+) %A ~ 80, %EC+%B+ ~ 20
204m1Fr 2.6 s (7+) %A=?
204m2Fr 1 s (10-) %A=?
205Fr 3.85 s (9/2-) %A > 99, %EC+%B+ < 1
206Fr 15.9 s (5+) %A=84 2, %EC+%B+=16 2
206m1Fr 0.7 s (10-) %A=0.3 1, %IT=?
207Fr 14.8 s 9/2- %A=95 2, %EC+%B+=5 2
208Fr 59.1 s 7+ %A=90 4, %EC+%B+=10 4
209Fr 50.0 s 9/2- %A=89 3, %EC+%B+=11 3
210Fr 3.18 m6+ %A=60 30, %EC+%B+=40 30
211Fr 3.10 m 9/2- %A>80, %EC<20
212Fr 20.0 m 5+ %EC+%B+=57 2, %A=43 2
213Fr 34.6 s 9/2- %A=99.45 3, %EC+%B+=0.55 3
214Fr 5.0 ms (1-) %A=100
214m1Fr 3.35 ms(8-) %A=100
215Fr 86 ns 9/2- %A=100
215m1Fr 3.5 ns (23/2)-
216Fr 0.70 us (1-) %A=100, %EC<2E-7 sys
217Fr 22 us 9/2- %A=100
218Fr 1.0 ms 1- %A=100
218m1Fr 22.0 ms %A < 100 , %IT=?
219Fr 20 ms 9/2- %A=100
220Fr 27.4 s 1+ %A=99.65 5, %B-=0.35 5
221Fr 4.9 m5/2- %A=100, %C=8.8E-11 11
222Fr 14.2 m 2- %B-=100
223Fr 21.8 m 3/2(-) %B-=99.994, %A=0.006
224Fr 3.33 m 1- %B-=100
225Fr 4.0 m 3/2- %B-=100
226Fr 49 s 1- %B-=100
227Fr 2.47 m 1/2+ %B-=100
228Fr 38 s 2- %B-=100
229Fr 50 s %B-=100
230Fr 19.1 s %B-=100
231Fr 17.5 s %B-=100
232Fr 5 s %B-=100
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory
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