List of isotopes / atomic number 91 to atomic number 100

from Wikipedia, the free encyclopedia

The list of isotopes is the overview page for easy access to all elements. The structure is also explained there and the legend for the table can also be found there. Decay energies were recalculated with the given masses and the mass-energy equivalent of .

91 Protactinium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
212 Pa 5.1 ms (3+) α =?
213 Pa 5.3 ms α =?
214 Pa 17 ms α =?
215 Pa 14 ms 8.17 α
216 Pa 0.20 s 8.10 (?) α ≈ 98, ε ≈ 2
217 Pa 4.9 ms 8.49 α
217m1 Pa 1.6 ms 10,344 α <100
218 Pa 0.12 ms 9.79 α
219 Pa 53 ns 10.08 9 / 2− α ≈ 100, εβ + ≈ 5 · 10 −9
220 Pa 0.78 µs 9.83 (α), 5.72 (εβ + ) α ≈ 100, εβ + = 3 · 10 −7
221 Pa 5.9 µs 9.25 9 / 2− α
222 Pa 2.9 ms 8.85 α
223 Pa 6.5 ms 8.34 α ≈ 100, εβ + <1.0 · 10 −3
224 Pa 0.79 s 7.694 α
225 Pa 1.7 s 7.39 α
226 Pa 1.8 min 6.987 (α), 2.834 (εβ + ) α = 74, εβ + = 26
227 Pa 38.3 min 6.580 (α), 1.019 (ε) (5 / 2−) α = 85, ε = 15
228 Pa 22 h 2.148 (εβ + ), 6.265 (α) 3+ εβ + = 98.0, α = 2.0
229 Pa 1.50 d 0.316 (ε), 5.841 (α) (5/2 +) ε ≈ 100, α = 0.48
230 Pa 17.4 d 1.310 (εβ + ), 0.563 (β - ), 5.439 (α) (2−) εβ + = 91.6, β - = 8.4, α = 0.0032
231 Pa 32760 a 5.149 (α), 51.843 ( 23 F), 60.41 ( 24 Ne) 3 / 2− α ≈ 100, SF <1.6 · 10 −11 , 23 F = 1 · 10 −12 , 24 Ne = 6 · 10 −10
232 Pa 1.31 d 1.337 (β - ), 0.495 (ε) (2−) β - ≈ 100, ε = 0.003
233 Pa 26,967 d 0.571 3 / 2− β -
234 Pa 6.70 h 2.197 4+ β - ≈ 100, SF <3 · 10 −10
234m1 Pa 1.17 min 2.271 (β - ), 0.074 (ε) (0−) β - ≈ 100, IT = 0.16, SF <1 · 10 −9
235 Pa 24.5 min 1.41 (3 / 2−) β -
236 Pa 9.1 min 2.9 1 (-) β -
237 Pa 8.7 min 2.25 (1/2 +) β -
238 Pa 2.3 min 3.46 (β - ) (3−) β - ≈ 100, SF <2.6 · 10 −6

92 uranium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
NH
(%)
Mass
(u)
218 U 1.5 ms 8.79 0+ α
219 U 42 µs 9.9 α =?
220 U 0+
221 U
222 U 1.0 µs 9.5 0+ α
223 U 18 µs 8.94 α =?
224 U 0.9 ms 8.62 0+ α
225 U 95 ms 8.02 α
226 U 0.35 s 7.715 0+ α
227 U 1.1 min 7.211 (α) (3/2 +) α ≈ 100, εβ + <0.001
228 U 9.1 min 6.804 (α), 0.307 (ε) 0+ α> 95, ε <5
229 U 58 min 1.309 (εβ + ), 6.475 (α) (3/2 +) εβ + ≈ 80, α ≈ 20
230 U 20.8 d 5.993 (α), 61.387 ( 22 Ne) 0+ α ≈ 100, SF <1.4 · 10 −10 , 22 Ne = 5 · 10 −11
231 U 4.2 d 0.36 (ε), 5.55 (α) (5 / 2−) ε ≈ 100, α ≈ 0.0055
232 U 68.9 a 5.414 (α), 62.309 ( 24 Ne), 74.318 ( 28 Mg) 0+ α ≈ 100, 24 Ne = 1.89 10 −10 , 28 Mg = 1.2 10 −11
233 U 1.592 x 10 5 a 4.909 (α), 60.485 ( 24 Ne), 60.776 ( 25 Ne), 74.225 ( 28 Mg) 5/2 + α ≈ 100, SF <6 10 -11 , 24 Ne = 7.4 10 -11 , 25 Ne = 7.2 10 -11 , 28 Mg = 1.3 10 -13
234 U 2.455 · 10 5 a 4.859 (α), 58.825 ( 24 Ne), 59.464 ( 26 Ne), 74.11 ( 28 Mg) 0+ α ≈ 100, SF = 1.64 10 −9 , 24 Ne = 9 10 −12 ?, 26 Ne = 9 10 −12 ?, 28 Mg = 2.2 10 −13 000.0055
235 U 7.038 x 10 8 a 4,679 (α), 57,362 ( 24 Ne), 57,756 ( 25 Ne), 72,158 ( 28 Mg), 72,485 ( 29 Mg) 7 / 2− α ≈ 100, SF = 7.0 · 10 −9 , 24 Ne = 8 · 10 −10 ?, 25 Ne = 8 x 10 −10 ?, 28 Mg = 1.8 · 10 −10 ?, 29 Mg = 1 , 8 · 10 −10 ? 000.7200
235m1 U 25 min 0 ??? 1/2 + IT
236 U 2.342 · 10 7 a 4,572 (α), 55,944 ( 24 Ne), 56,744 ( 26 Ne), 70,564 ( 28 Mg), 72,303 ( 30 Mg) 0+ α ≈ 100, SF = 9.4 10 −8 , 24 Ne = 9 10 −10 ?, 26 Ne = 9 10 −10 ?, 28 Mg = 2 10 −11 ?, 30 Mg = 2 10 −11 ?
237 U 6.75 d 0.519 1/2 + β -
238 U 4.468 · 10 9 a 4.270 (α) 0+ α ≈ 100, SF = 5.45 · 10 −5 , 2β = 2.2 · 10 −10 099.2745
238m1 U 225 ns 0+
238m2 U 1 ns
239 U 23.45 min 1.265 5/2 + β -
240 U 14.1 h 0.338 0+ β -
241 U
242 U 16.8 min 0+ β -

93 neptunium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
225 Np 6 ms α =?
226 Np 35 ms 8.2 α
227 Np 0.51 s 7.816 (α) α ≈ 100, εβ + ≈ 0.05
228 Np 61.4 s 4.48 (ε), 7.42 (α) ε = 60, α = 40, εSF = 0.020
229 Np 4.0 min 7.01 (α), 2.56 (ε) α> 50, ε <50
230 Np 4.6 min 3.61 (εβ + ), 6.78 (α) εβ + <97, α> 3
231 Np 48.8 min 1.84 (ε), 6.37 (α) (5/2) ε = 98, α = 2
232 Np 14.7 min 2.70 (4+) εβ +
233 Np 36.2 min 1.23 (ε), 5.83 (α) (5/2 +) ε = 100, α <0.001
234 Np 4.4 d 1.81 (0+) εβ +
235 Np 396.1 d 0.124 (ε), 5.192 (α) 5/2 + ε ≈ 100, α = 0.00260
236 Np 1.54 · 10 5 a 0.94 (ε), 0.49 (β - ), 5.02 (α) (6−) ε = 87.3, β - = 12.5, α = 0.16
236m1 Np 22.5 h 1.00 (ε), 0.55 (β - ) 1 ε = 52, β - = 48
237 Np 2.144 x 10 6 a 4.959 (α), 74.818 ( 30 mg) 5/2 + α ≈ 100, SF <2 · 10 −10 , 30 Mg = 8 · 10 −12
237m1 Np 45 ns α ≈ 100, SF =?
238 Np 2.117 d 1.292 2+ β -
238m1 Np 112 ns
239 Np 2.3565 d 0.722 5/2 + β -
240 Np 61.9 min 2.20 (5+) β -
240m1 Np 7.22 min 2.20 (β - ), 0 (IT) 1 (+) β - ≈ 100, IT = 0.11
241 Np 13.9 min 1.31 (5/2 +) β -
242 Np 5.5 min 2.70 (6) β -
242m1 Np 2.2 min 2.70 (1+) β -
243 Np 1.8 min 2.17 (5 / 2−) β -
244 Np 2.29 min (7−) β -

94 plutonium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
NH
(%)
Mass
(u)
228 Pooh 4 ms 7.95 0+ α
229 Pu 90 s α
230 pu 1.7 min 7.175 (α) 0+ α <100, εβ + > 0
231 Pu 8.6 min εβ + =?, α =?
232 Pu 34.1 min 1.06 (εβ + ), 6.716 (α) 0+ ε = 77, α = 23
233 Pu 20.9 min 1.90 (εβ + ), 6.42 (α) εβ + ≈ 100, α = 0.12
234 Pu 8.8 h 0.388 (εβ + ), 6.31 (α) 0+ ε ≈ 94, α ≈ 6
234m1 pu 3 ns
235 Pu 25.3 min 1.17 (εβ + ), 6.00 (α) (5/2 +) εβ + ≈ 100, α = 0.0027
235m1 pu 25 ns
236 Pu 2,858 a 5.867 (α), 79.669 ( 28 mg) 0+ α ≈ 100, SF = 1.37 10 −7 , 28 Mg = 8 10 −12
236m1 pu 37 · 10 −12 s (0+)
236m2 pu 34 ns
237 Pu 45.2 d 0.22 (ε), 5.75 (α) 7 / 2− ε ≈ 100, α = 0.0042
237m1 pu 0.18 s 0.146 (IT) 1/2 + IT
237m2 Pu 85 ns SF ≤ 100
237m3 Pu 1.1 µs SF ≤ 100
238 Pu 87.74 a 5.593 (α), 75.911 ( 28 Mg), 76.823 ( 30 Mg), 76.823 ( 32 Si) 0+ α ≈ 100, SF = 1.85 · 10 −7 , 28 Mg ≈ 6 · 10 −15 ?, 30 Mg ≈ 6 · 10 −15 ?, 32 Si ≈ 1.4 · 10 −14
238m1 pu 0.6 ns SF ≤ 100
238m2 Pu 6.0 ns (0+) SF ≤ 100
239 Pu 24110 a 5.245 (α) 1/2 + α ≈ 100, SF = 3.0 · 10 −10
239m1 pu 7.5 µs (5/2 +)
239m2 Pu 2.6 ns (9 / 2−)
240 pu 6563 a 5.256 (α), 91.191 ( 34 Si) 0+ α ≈ 100, SF = 5.75 · 10 −6 , 34 Si = 1.1 · 10 −12
240m1 pu 3.7 ns 0+ SF> 0
241 Pu 14.35 a 0.021 (β - ), 5.140 (α) 5/2 + β - ≈ 100, α = 0.0025, SF ≈ 2.4 · 10 −14
241m1 pu 21 µs SF> 0
241m2 pu 32 ns
242 Pu 3.733 x 10 5 a 4.984 (α) 0+ α ≈ 100, SF = 5.54 · 10 −4
243 Pu 4.956 h 0.528 7/2 + β -
243m1 pu 45 ns
244 Pu 8.00 · 10 7 a 4.666 (α) 0+ α = 99.879, SF = 0.121, 2β <3 · 10 −11 100
244m1 pu 400 ps 0+ SF ≤ 100
245 Pu 10.5 h 1.205 (9 / 2−) β -
245m1 pu 90 ns
246 Pu 10.84 d 0.401 0+ β -
247 Pu 2.27 d β -

95 americium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
232 Am 79 p ? (ε), 7.2 (α) ε ≈ 98, α ≈ 2, εSF = 0.069
233 On 4.17 (εβ + ), 6.87 (α) εβ + ≈ 100, α = 0.04
234 On 2.32 min ε ≈ 100, α = 0.039, εSF = 0.0066
235 On 15 minutes εβ + =?, α =?
236 On 3.28 (ε), 6.45 (α) ε =?, α =?
237 On 73.0 min 1.73 (ε), 6.25 (α) 5/2 (-) ε ≈ 100, α = 0.025
237m1 at 5 ns SF =?
238 On 98 min 2.26 (εβ + ), 6.04 (α) 1+ εβ + ≈ 100, α = 1.0 · 10 −4
238m1 at 35 µs
239 On 11.9 h 0.803 (ε), 5.924 (α) (5/2) - ε ≈ 100, α = 0.010
239m1 at 163 ns (7/2 +)
240 am 50.8 h 1.379 (ε), 5.710 (α) (3−) ε = 100, α = 1.9 · 10 −4
240m1 at 0.924 ms SF =?
241 On 432.2 a 5.638 (α), 93.927 ( 34 Si) 5 / 2− α ≈ 100, SF = 4.3 10 −10 , 34 Si = 5 10 −13
241m1 at 1.2 µs
242 On 16.02 h 0.665 (β - ), 0.751 (ε) 1− β - = 82.7, ε = 17.3
242m1 at 141 a 0.049 (β - ), 5.637 (α) 5− IT ≈ 100, α = 0.459, SF <4.7 · 10 −9
242m2 Am 14.0 ms 2.20 (β - ), 7.788 (α) SF =?, IT =?
243 On 7370 a 5.438 (α) 5 / 2− α ≈ 100, SF = 3.7 · 10 −9
243m1 at 5.5 µs
244 On 10.1 h 1.428 (β - ) (6−) β -
244m1 at 6.5 µs SF =?
244m2 Am 26 min 1.516 (β - ), 0.164 (ε) 1+ β - ≈ 100, ε = 0.0361
245 On 2.05 h 0.894 (5/2) + β -
245m1 at 0.64 µs
246 On 39 min 2.376 (7−) β -
246m1 at 25.0 min 2.376 (β - ), 0 (IT) 2 (-) β - ≈ 100, IT <0.01
246m2 Am 73 µs
247 On 23.0 min 1.7 (5/2) β -
248 On 3.1 (5/2) β -

96 curium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
233 cm 1 min 3/2 +
234 cm 51 s 0+ β + = 47, SF = 3
235 cm 5 min 5/2 +
235P Cm
236 cm 10 min 1.71 (εβ + ), 7.1 (α) 0+ εβ + =?, α =?
237 cm 20 min 5/2 + α =?
237P Cm 7 / 2−
238 cm 2.4 h 0.97 (ε), 6.62 (α) 0+ ε = 96.16, α = 3.84
239 cm 2.9 h 1.7 (ε), 6.46 (α) (7 / 2−) ε ≈ 100, α <0.1
240 cm 27 d 6.397 (α), 0.215 (ε) 0+ α ≈ 100, ε <0.5, SF = 3.9 · 10 −6
240m1 Cm 10 ps SF ≤ 100
240m2 Cm 55 ns SF ≈ 100
241 cm 32.8 d 0.767 (ε), 6.185 (α) 1/2 + ε ≈ 100, α = 1.0
241m1 Cm 15.3 ns
242 cm 162.8 d 6.216 (α), 96.51 ( 34 Si) 0+ α ≈ 100, SF = 6.37 · 10 −6 , 34 Si = 1 · 10 −14
242m1 Cm 40 · 10 −12 s
242m2 Cm 0.18 µs 2.80 (IT) IT =?, SF =?
243 cm 29.1 a 6.196 (α), 0.009 (ε) 5/2 + α ≈ 100, ε = 0.29, SF = 5.3 · 10 −9
243m1 Cm 42 ns
244 cm 18.10 a 5.902 (α) 0+ α ≈ 100, SF = 1.371 · 10 −4
244m1 Cm 34 ms 1.04 (IT) 6+ IT = 100, SF <7.7 · 10 −10
245 cm 8500 a 5.623 (α) 7/2 + α ≈ 100, SF = 6.1 · 10 −7
245m1 Cm 13.2 ns
246 cm 4730 a 5.475 (α) 0+ α ≈ 100, SF = 0.0263
247 cm 1.56 · 10 7 a 5.353 9 / 2− α
248 cm 3.40 x 10 5 a 5.162 (α) 0+ α = 91.61, SF = 8.39
249 cm 64.15 min 1/2 (+) β -
250 cm 9000 a 5.169 (α), 0.90 (β - ) 0+ SF ≈ 86, α ≈ 8, β - ≈ 6
251 cm 16.8 min 1.42 (1/2 +) β -
252 cm 2 d 0+ β -

97 Berkelium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
238 Bk 144 s 5.0 (εβ + ) εβ + ≈ 100, εSF = 0.048
239 Bk (7/2 +)
240 Bk 4.8 min 3.94 (εβ + ) εβ + ≈ 100, εSF = 1 · 10 −3
241 Bk (7/2 +)
242 Bk 7.0 min 3.0 (εβ + ) εβ + ≈ 100, SF> 0
242m1 Bk 9.5 ns
242m2 Bk 0.60 µs
243 Bk 4.5 h 1.508 (ε), 6.874 (α) (3 / 2−) ε ≈ 100, α ≈ 0.15
243m1 Bk 5 ns
244 Bk 4.35 h 2.26 (ε), 6.78 (α) (1−) ε ≈ 100, α = 0.006
244m1 Bk 820 ns SF ≤ 100
245 Bk 4.94 d 0.81 (ε), 6.455 (α) 3 / 2− ε ≈ 100, α = 0.12
245m1 Bk 2 ns
246 Bk 1.80 d 1.35 (ε), 6.07 (α) 2 (-) ε = 100, α <0.2
247 Bk 1380 a 5.889 (3 / 2−) α <100
248 Bk 9 a 5.803 (6+) α> 70
248m1 Bk 23.7 h 0.87 (β - ), 0.717 (ε), 5.803 (α) 1 (-) β - = 70, ε = 30, α <0.001
249 Bk 320 d 0.125 (β - ), 5.526 (α) 7/2 + β - ≈ 100, α = 0.00145, SF = 4.76 · 10 −8
250 Bk 3.217 h 1.78 2− β -
251 Bk 55.6 min 1.093 (β - ), 5.57 (α) (3 / 2−) β - ≈ 100, α ≈ 1 · 10 −5

98 californium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
237 Cf 2.1 s SF ≈ 10
238 Cf 21 ms 0+ SF ≈ 100
239 Cf 39 s 7.81 (α), 3.9 (ε) α> 50, ε <50
240 cf 1.06 min 7.719 (α) 0+ α ≈ 87, SF ≈ 13
241 Cf 3.78 min 3.3 (ε), 7.66 (α) ε ≈ 75, α ≈ 25
242 Cf 3.49 min 7.516 (α) 0+ α = 65, SF <1.4 · 10 −2
243 Cf 10.7 min 2.22 (ε), 7.39 (α) (1/2 +) ε ≈ 86, α ≈ 14
244 Cf 19.4 min 7.329 0+ α = 70
245 Cf 45.0 min 1.569 (ε), 7.256 (α) (5/2 +) ε = 64, α = 36
246 Cf 35.7 h 6.862 (α), 0.12 (ε) 0+ α ≈ 100, SF = 2.3 · 10 −4 , ε <5 · 10 −4
246m1 Cf 45 ns
247 Cf 3.11 h 0.646 (ε), 6.527 (α) (7/2 +) ε ≈ 100, α = 0.035
248 Cf 333.5 d 6.361 (α) 0+ α ≈ 100, SF = 0.0029
249 Cf 351 a 6.295 (α) 9 / 2− α ≈ 100, SF = 4.4 · 10 −7
250 cf 13.08 a 6.176 (α) 0+ α ≈ 100, SF = 0.077
251 Cf 898 a 6.176 (α) 1/2 + α
252 Cf 2,645 a 6.217 (α) 0+ α = 96.908, SF = 3.092
253 Cf 17.81 d 0.285 (β - ), 6.124 (α) (7/2 +) β - = 99.69, α = 0.31
254 Cf 60.5 d 5.926 (α) 0+ SF = 99.69, α = 0.31
255 Cf 85 min 0.7 (9/2 +) β -
256 Cf 12.3 min 5.6 (α) 0+ SF = 100, β - <1, α ≈ 1 · 10 −6

99 Einsteinium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
241 it 9 s α
242 It 40 s 5.6 (ε) α ≈ 100, εSF = 1.4
243 It 21 s 4.0 (ε), 8.072 (α) ε <70, α> 30
244 it 37 p 4.56 (ε), 7.95 (α) ε = 96, α = 4, εSF = 0.01
245 It 1.1 min 3.05 (ε), 7.909 (α) (3 / 2−) ε = 60, α = 40
246 it 7.7 min 3.88 (ε), 7.74 (α) (4−, 6+) ε = 90.1, α = 9.9, εSF = 0.003
247 it 4.55 min 2.48 (ε), 7.49 (α) (7/2 +) ε ≈ 93, α ≈ 7
248 it 27 min (2−, 0+) ε ≈ 100, α ≈ 0.25, εSF = 3 · 10 −5
249 it 102.2 min 1.45 (ε), 6.94 (α) 7/2 (+) ε ≈ 100, α = 0.57
250 it 8.6 h 2.10 (ε), 6.88 (α) (6+) ε> 97, α <3
250m1 it 2.22 h 2.10 (ε), 6.88 (α) 1 (-) ε ≈ 100, α <1
251 it 33 h 0.376 (ε), 6.597 (α) (3 / 2−) ε ≈ 100, α = 0.49
252 it 471.7 d 6.76 (α), 1.26 (ε), 0.48 (β - ) (5−) α = 76, ε = 24, β - ≈ 0.01
253 it 20.47 d 6.739 (α) 7/2 + α ≈ 100, SF = 8.9 · 10 −6
254 it 275.7 d 6.628 (α), 0.654 (ε), 1.09 (β - ) (7+) α ≈ 100, ε <1 · 10 −4 , β - = 1.74 · 10 −6 , SF <3 · 10 −6
254m1 it 39.3 h 1.168 (β - ), 0.078 (IT), 6.696 (α), 0.732 (ε) 2+ β - ≈ 100, α = 0.33, IT <3, ε = 0.078, SF <0.045
255 It 39.8 d 0.288 (β - ), 6.436 (α) (7/2 +) β - = 92.0, α = 8.0, SF = 0.0045
256 It 25.4 min 1.67 (1+) β -
256m1 it 7.6 h 1.67 (β - ) (8+) β - ≈ 100, SF = 0.002
257 it 7.8 d SF =?, Β - =?

100 fermium

isotope Half-life Decay energy
(MeV)
Spin /
parity
Type (s) of decay
(%)
Mass
(u)
242 m 0.8 ms 0+ SF
243 m 0.18 s 8.69 (α) α <100, SF <0.5, ε =?
244 ft 3.3 ms 0+ SF
245 m 4.2 s 8.44 (α) α ≈ 100, SF <0.11
246 ft 1.1 s 8.374 (α), 2.16 (ε) 0+ α = 92, SF = 7.3, ε <1
247 m 35 s 8.19 (α) α> 50, εβ + <50
247m1 Fm 9.2 s α <100
248 ft 36 s 8.002 (α), 1.6 (ε) 0+ α = 93, ε ≈ 7, SF = 0.10
249 m 2.6 min 2.44 (ε), 7.81 (α) (7/2 +) ε ≈ 85, α ≈ 15
250 m 30 min 7.557 (α), 0.8 (ε) 0+ α> 90, ε <10, SF = 0.0069
250m1 Fm 1.8 s 1.0 (IT) IT> 80, SF <8 · 10 −5
251 ft 5.30 h 1.474 (ε), 7.425 (α) (9 / 2−) ε = 98.20, α = 1.80
252 ft 25.39 h 7.153 (α) 0+ α ≈ 100, SF = 0.00232
253 m 3.00 d 0.333 (ε), 7.197 (α) 1/2 + ε = 88, α = 12
254 m 3.240 h 7.307 (α) 0+ α ≈ 100, SF = 0.0592
255 ft 20.07 h 7.241 (α) 7/2 + α ≈ 100, SF = 2.3 · 10 −5
256 ft 157.6 min 7.027 (α) 0+ SF = 91.9, α = 8.1
256m1 Fm 70 ns IT> 80, SF =?
257 m 100.5 d 6.864 (α) (9/2 +) α = 99.790, SF = 0.210
258 ft 370 µs 0+ SF
259 m 1.5 s SF
260 m 4 ms SF

swell


See also list of isotopes # web links