More information 符號, Z ...
符號
|
Z
|
N
|
同位素質量(u) [n 1][n 2]
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半衰期 [n 2]
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衰變 方式[1]
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衰變 產物
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原子核 自旋[n 1]
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激發能量[n 2]
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241Fm
|
100
|
141
|
241.07421(32)#
|
730(60) µs
|
SF(>78%)
|
(various)
|
5/2#+
|
α (<14%)
|
237Cf
|
242Fm
|
100
|
142
|
242.07343(43)#
|
<4 μs[2]
|
SF
|
(various)
|
0+
|
243Fm
|
100
|
143
|
243.07447(23)#
|
231(9) ms
|
α (91%)
|
239Cf
|
7/2−#
|
SF (9%)
|
(various)
|
β+ (不常見)
|
243Es
|
244Fm
|
100
|
144
|
244.07404(22)#
|
3.12(8) ms
|
SF (99%)
|
(various)
|
0+
|
α (1%)
|
240Cf
|
245Fm
|
100
|
145
|
245.07535(21)#
|
4.2(13) s
|
α (95.7%)
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241Cf
|
1/2+#
|
β+ (4.2%)
|
245Es
|
SF (.13%)
|
(various)
|
246Fm
|
100
|
146
|
246.075350(17)
|
1.54(4) s
|
α (85%)
|
242Cf
|
0+
|
β+ (10%)
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246Es
|
β+, SF (10%)
|
(various)
|
SF (4.5%)
|
(various)
|
247Fm
|
100
|
147
|
247.07695(12)#
|
31(1) s
|
α (>50%)
|
243Cf
|
(7/2+)
|
β+ (<50%)
|
247Es
|
248Fm
|
100
|
148
|
248.077186(9)
|
35.1(8) s
|
α (93%)
|
244Cf
|
0+
|
β+ (7%)
|
248Es
|
SF (.10%)
|
(various)
|
249Fm
|
100
|
149
|
249.078928(7)
|
1.6(1) min
|
β+ (85%)
|
249Es
|
(7/2+)#
|
α (15%)
|
245Cf
|
250Fm
|
100
|
150
|
250.079521(9)
|
30.4(15) min
|
α (90%)
|
246Cf
|
0+
|
ε (10%)
|
250Es
|
SF (6.9×10−3%)
|
(various)
|
250mFm
|
1199.2(10) keV
|
1.92(5) s
|
IT
|
250Fm
|
(8−)
|
251Fm
|
100
|
151
|
251.081540(16)
|
5.30(8) h
|
β+ (98.2%)
|
251Es
|
(9/2−)
|
α (1.8%)
|
247Cf
|
251mFm
|
200.09(11) keV
|
21.1(16) µs
|
|
|
(5/2+)
|
252Fm
|
100
|
152
|
252.082467(6)
|
25.39(4) h
|
α (99.99%)
|
248Cf
|
0+
|
SF (.0023%)
|
(various)
|
253Fm
|
100
|
153
|
253.085185(4)
|
3.00(12) d
|
ε (88%)
|
253Es
|
(1/2)+
|
α (12%)
|
249Cf
|
254Fm
|
100
|
154
|
254.0868544(30)
|
3.240(2) h
|
α (99.94%)
|
250Cf
|
0+
|
SF (.0592%)
|
(various)
|
255Fm
|
100
|
155
|
255.089964(5)
|
20.07(7) h
|
α
|
251Cf
|
7/2+
|
SF (2.4×10−5%)
|
(various)
|
256Fm
|
100
|
156
|
256.091774(8)
|
157.6(13) min
|
SF (91.9%)
|
(various)
|
0+
|
α (8.1%)
|
252Cf
|
257Fm[n 3]
|
100
|
157
|
257.095106(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[n 4][n 5]
|
100
|
160
|
260.10281(55)#
|
4 ms
|
|
|
0+
|
Close
畫上#號的數據代表沒有經過實驗的証明,僅為理論推測。
Heaviest nuclide produced via neutron capture
Discovery of this isotope is unconfirmed
Not directly synthesized, occurs as decay product of 260Md