Fermium
Main article: Isotopes of fermium
| Isotope | Half-life | Spin Parity | Mode(s) or Abundance |
|---|---|---|---|
| 242Fm | 0.8 ms | 0+ | %SF=100 |
| 243Fm | 0.18 s | %α < 100, %SF < 0.5, %K=? | |
| 244Fm | 3.3 ms | 0+ | %SF=100 |
| 245Fm | 4.2 s | %α=100, %SF < 0.11 | |
| 246Fm | 1.1 s | 0+ | %α=92, %SF=7.3, %K<1 sys |
| 247Fm | 35 s | %α > 50, %K+%β+ < 50 | |
| 247m1Fm | 9.2 s | %α < 100 | |
| 248Fm | 36 s | 0+ | %α=93, %K ~ 7, %SF=0.10 |
| 249Fm | 2.6 m | (7/2+ ) | %K ~ 85 sys %α ~ 15 sys |
| 250Fm | 30 m | 0+ | %α>90, %K<10, %SF=0.0069 |
| 250m1Fm | 1.8 s | %IT>80, %SF < 8E-5 | |
| 251Fm | 5.30 h | (9/2- ) | %K=98.20, %α=1.80 |
| 252Fm | 25.39 h | 0+ | %α=99.9977, %SF=0.00232 |
| 253Fm | 3.00 d | 1/2+ | %K=88, %α=12 |
| 254Fm | 3.240 h | 0+ | %α=99.9408, %SF=0.0592 |
| 255Fm | 20.07 h | 7/2+ | %α=100, %SF=2.3E-5 |
| 256Fm | 157.6 m | 0+ | %SF=91.9, %α=8.1 |
| 257Fm | 100.5 d | (9/2+ ) | %α=99.790, %SF=0.210 |
| 258Fm | 370 μs | 0+ | %SF=100 |
| 259Fm | 1.5 s | %SF=100 |
Read more about this topic: Isotope Lists, 97+