Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
|---|---|---|---|---|---|---|---|
| excitation energy | |||||||
| 242Fm | 100 | 142 | 242.07343(43)# | 0.8(2) ms | SF | (various) | 0+ |
| α (rare) | 238Cf | ||||||
| 243Fm | 100 | 143 | 243.07435(23)# | 210(60) ms |
α (60%) | 239Cf | 7/2-# |
| β+ (40%) | 243Es | ||||||
| SF (.57%) | (various) | ||||||
| 244Fm | 100 | 144 | 244.07408(30)# | 3.3(5) ms | SF (99%) | (various) | 0+ |
| α (1%) | 240Cf | ||||||
| 245Fm | 100 | 145 | 245.07539(30)# | 4.2(13) s | α (95.7%) | 241Cf | 1/2+# |
| β+ (4.2%) | 245Es | ||||||
| SF (.13%) | (various) | ||||||
| 246Fm | 100 | 146 | 246.07530(4) | 1.1(2) s | α (85%) | 242Cf | 0+ |
| β+ (10%) | 246Es | ||||||
| β+, SF (10%) | (various) | ||||||
| SF (4.5%) | (various) | ||||||
| 247Fm | 100 | 147 | 247.07685(15)# | 29(1) s | α (50%) | 243Cf | (7/2+) |
| β+ (50%) | 247Es | ||||||
| 248Fm | 100 | 148 | 248.077195(13) | 36(2) s | α (99%) | 244Cf | 0+ |
| β+ (1%) | 248Es | ||||||
| SF (.05%) | (various) | ||||||
| 249Fm | 100 | 149 | 249.07903(11)# | 2.6(7) min | β+ (85%) | 249Es | (7/2+)# |
| α (15%) | 245Cf | ||||||
| 250Fm | 100 | 150 | 250.079521(13) | 30(3) min | α (90%) | 246Cf | 0+ |
| EC (10%) | 250Es | ||||||
| SF (6×10−4%) | (various) | ||||||
| 250mFm | 1500(300)# keV | 1.8(1) s | IT | 250Fm | 7,8# | ||
| 251Fm | 100 | 151 | 251.081575(9) | 5.30(8) h | β+ (98.2%) | 251Es | (9/2-) |
| α (1.8%) | 247Cf | ||||||
| 251mFm | 191(2) keV | 15.2(23) µs | (5/2+) | ||||
| 252Fm | 100 | 152 | 252.082467(6) | 25.39(4) h | α (99.99%) | 248Cf | 0+ |
| SF (.0023%) | (various) | ||||||
| β+β+ (rare) | 252Cf | ||||||
| 253Fm | 100 | 153 | 253.085185(4) | 3.00(12) d | EC (88%) | 253Es | (1/2)+ |
| α (12%) | 249Cf | ||||||
| 254Fm | 100 | 154 | 254.0868542(30) | 3.240(2) h | α (99.94%) | 250Cf | 0+ |
| SF (.06%) | (various) | ||||||
| 255Fm | 100 | 155 | 255.089962(5) | 20.07(7) h | α | 251Cf | 7/2+ |
| SF (2×10−5%) | (various) | ||||||
| 256Fm | 100 | 156 | 256.091773(8) | 157.6(13) min | SF (91.9%) | (various) | 0+ |
| α (8.1%) | 252Cf | ||||||
| 257Fm | 100 | 157 | 257.095105(7) | 100.5(2) d | α (99.79%) | 253Cf | (9/2+) |
| SF (.21%) | (various) | ||||||
| 258Fm | 100 | 158 | 258.09708(22)# | 370(14) µs | SF | (various) | 0+ |
| 259Fm | 100 | 159 | 259.1006(3)# | 1.5(3) s | SF | (various) | 3/2+# |
| 260Fm | 100 | 160 | 260.10268(54)# | 1# min | 0+ | ||
Read more about this topic: Isotopes Of Fermium
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