锎 的同位素
图表
符号
Z( p
)
N( n
)
同位素质量(u )
半衰期
衰变 方式 [1] [n 1]
衰变 产物
原子核 自旋
激发能量
237 Cf
98
139
237.06207(54)#
2.1(3) s
SF
(various)
5/2+#
β+
237 Bk
α
233 Cm
238 Cf
98
140
238.06141(43)#
21.1(13) ms
SF
(various)
0+
β+ (不常见)
238 Bk
α (不常见)
234 Cm
239 Cf
98
141
239.06242(23)#
60(30) s [39(+37−12) s]
α
235 Cm
5/2+#
β+ (不常见)
239 Bk
240 Cf
98
142
240.06230(22)#
1.06(15) min
α (98%)
236 Cm
0+
SF (2%)
(various)
β+ (不常见)
240 Bk
241 Cf
98
143
241.06373(27)#
3.78(70) min
β+ (75%)
241 Bk
7/2−#
α (25%)
237 Cm
242 Cf
98
144
242.06370(4)
3.49(15) min
α (80%)
238 Cm
0+
β+ (20%)
242 Bk
SF (.014%)
(various)
243 Cf
98
145
243.06543(15)#
10.7(5) min
β+ (86%)
243 Bk
(1/2+)
α (14%)
239 Cm
244 Cf
98
146
244.066001(3)
19.4(6) min
α (99%)
240 Cm
0+
ε (1%)
244 Bk
245 Cf
98
147
245.068049(3)
45.0(15) min
β+ (64%)
245 Bk
(5/2+)
α (36%)
241 Cm
246 Cf
98
148
246.0688053(22)
35.7(5) h
α
242 Cm
0+
ε (5×10−4 %)
246 Bk
SF (2×10−4 %)
(various)
247 Cf
98
149
247.071001(9)
3.11(3) h
ε (99.96%)
247 Bk
(7/2+)#
α (.04%)
243 Cm
248 Cf
98
150
248.072185(6)
333.5(28) d
α (99.99%)
244 Cm
0+
SF (.0029%)
(various)
249 Cf
98
151
249.0748535(24)
351(2) y
α
245 Cm
9/2−
SF (5×10−7 %)
(various)
249m Cf
144.98(5) keV
45(5) µs
5/2+
250 Cf
98
152
250.0764061(22)
13.08(9) y
α (99.92%)
246 Cm
0+
SF (.077%)
(various)
251 Cf[n 2]
98
153
251.079587(5)
900(40) y
α
247 Cm
1/2+
252 Cf[n 3]
98
154
252.081626(5)
2.645(8) y
α (96.9%)
248 Cm
0+
SF (3.09%)[n 4]
(various)
253 Cf
98
155
253.085133(7)
17.81(8) d
β− (99.69%)
253 Es
(7/2+)
α (.31%)
249 Cm
254 Cf
98
156
254.087323(13)
60.5(2) d
SF (99.69%)
(various)
0+
α (.31%)
250 Cm
β− β− (不常见)
254 Fm
255 Cf
98
157
255.09105(22)#
85(18) min
β− (99.99%)
255 Es
(7/2+)
SF (.001%)
(various)
α (10−5 %)
251 Cm
256 Cf
98
158
256.09344(32)#
12.3(12) min
SF (99%)
(various)
0+
β− (1%)
256 Es
α (10−6 %)
252 Cm
β− β− (不常见)
256 Fm
备注: 画上#号的数据代表没有经过实验的证明,只是理论推测而已,而用括号括起来的代表数据不确定性。
注释
参考文献
Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report) . Pure Appl. Chem. Vol. 75, No. 6, pp. 683–800, (2003) and Atomic Weights Revised (2005) .
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties , Nuc. Phys. A 729, pp. 3–128 (2003).
National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition , online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
元素 与同位素 的稳定度
稳定9个
稳定6个
稳定5个
稳定4个
稳定3个
稳定2个
稳定1个
1亿年〜
1万年〜
10年〜
100日〜
1日〜
1时〜
10分〜
1分〜
10秒〜
1秒〜
不到1秒
幻数