鋦有從233Cm到251Cm共19種同位素以及10種同核異構體,全部都有放射性。其中,247Cm最穩定,半衰期1560萬年,是之後所有原子序更高的核素半衰期的至少一萬倍。它是R-過程產生的絕種核素。[1][2]鋦最穩定的同核異構體則是246mCm,半衰期1.12秒。
Quick Facts 同位素, 衰變 ...
主要的鋦同位素
同位素
|
衰變
|
|
豐度
|
半衰期 (t1/2)
|
方式
|
能量 (MeV)
|
產物
|
242Cm
|
人造
|
162.8 天
|
α
|
6.216
|
238Pu
|
SF
|
–
|
–
|
243Cm
|
人造
|
29.1 年
|
α
|
6.169
|
239Pu
|
ε
|
0.007
|
243Am
|
SF
|
–
|
–
|
244Cm
|
人造
|
18.11 年
|
α
|
5.902
|
240Pu
|
SF
|
–
|
–
|
245Cm
|
人造
|
8250 年
|
α
|
5.624
|
241Pu
|
SF
|
–
|
–
|
246Cm
|
人造
|
4706 年
|
α
|
5.475
|
242Pu
|
SF
|
–
|
–
|
247Cm
|
人造
|
1.56×107 年
|
α
|
5.354
|
243Pu
|
248Cm
|
人造
|
3.48×105 年
|
α
|
5.162
|
244Pu
|
SF
|
–
|
–
|
250Cm
|
人造
|
8300 年?
|
SF
|
–
|
–
|
α
|
5.170
|
246Pu
|
β−
|
0.038
|
250Bk
| |
|
|
Close
More information 符號, Z ...
符號
|
Z
|
N
|
同位素質量(u) [n 1][n 2]
|
半衰期 [n 1][n 2]
|
衰變 方式[3]
|
衰變 產物 [n 3]
|
原子核 自旋[n 1]
|
激發能量[n 2]
|
233Cm
|
96
|
137
|
233.05077(8)
|
1# min
|
β+
|
233Am
|
3/2+#
|
α
|
229Pu
|
234Cm
|
96
|
138
|
234.05016(2)
|
51(12) s
|
β+
|
234Am
|
0+
|
α
|
230Pu
|
235Cm
|
96
|
139
|
235.05143(22)#
|
5# min
|
β+
|
235Am
|
5/2+#
|
α
|
231Pu
|
236Cm
|
96
|
140
|
236.05141(22)#
|
10# min
|
β+
|
236Am
|
0+
|
α
|
232Pu
|
237Cm
|
96
|
141
|
237.05290(22)#
|
20# min
|
β+
|
237Am
|
5/2+#
|
α
|
233Pu
|
238Cm
|
96
|
142
|
238.05303(4)
|
2.4(1) h
|
ε (90%)
|
238Am
|
0+
|
α (10%)
|
234Pu
|
239Cm
|
96
|
143
|
239.05496(11)#
|
~2.9 h
|
β+ (99.9%)
|
239Am
|
(7/2−)
|
α (.1%)
|
235Pu
|
240Cm
|
96
|
144
|
240.0555295(25)
|
27(1) d
|
α (99.5%)
|
236Pu
|
0+
|
ε (.5%)
|
240Am
|
SF (3.9×10−6%)
|
(various)
|
241Cm
|
96
|
145
|
241.0576530(23)
|
32.8(2) d
|
ε (99%)
|
241Am
|
1/2+
|
α (1%)
|
237Pu
|
242Cm[n 4]
|
96
|
146
|
242.0588358(20)
|
162.8(2) d
|
α
|
238Pu
|
0+
|
SF (6.33×10−6%)
|
(various)
|
CD (10−14%)[n 5]
|
208Pb 34Si
|
243Cm
|
96
|
147
|
243.0613891(22)
|
29.1(1) y
|
α (99.71%)
|
239Pu
|
5/2+
|
ε (.29%)
|
243Am
|
SF (5.3×10−9%)
|
(various)
|
243mCm
|
87.4(1) keV
|
1.08(3) µs
|
|
|
1/2+
|
244Cm[n 4]
|
96
|
148
|
244.0627526(20)
|
18.10(2) y
|
α
|
240Pu
|
0+
|
SF (1.34×10−4%)
|
(various)
|
244mCm
|
1040.188(12) keV
|
34(2) ms
|
IT
|
244Cm
|
6+
|
245Cm
|
96
|
149
|
245.0654912(22)
|
8.5(1)×103 y
|
α
|
241Pu
|
7/2+
|
SF (6.1×10−7%)
|
(various)
|
245mCm
|
355.90(10) keV
|
290(20) ns
|
|
|
1/2+
|
246Cm
|
96
|
150
|
246.0672237(22)
|
4.76(4)×103 y
|
α (99.97%)
|
242Pu
|
0+
|
SF (.0261%)
|
(various)
|
246mCm
|
1179.66(13) keV
|
1.12(0.24) s
|
IT
|
246Cm
|
8-
|
247Cm
|
96
|
151
|
247.070354(5)
|
1.56(5)×107 y
|
α
|
243Pu
|
9/2−
|
248Cm
|
96
|
152
|
248.072349(5)
|
3.48(6)×105 y
|
α (91.74%)
|
244Pu
|
0+
|
SF (8.26%)
|
(various)
|
249Cm
|
96
|
153
|
249.075953(5)
|
64.15(3) min
|
β−
|
249Bk
|
1/2(+)
|
249mCm
|
48.758(17) keV
|
23 µs
|
|
|
(7/2+)
|
250Cm
|
96
|
154
|
250.078357(12)
|
8,300# y
|
SF (80%)[n 6]
|
(various)
|
0+
|
α (11%)
|
246Pu
|
β− (9%)
|
250Bk
|
251Cm
|
96
|
155
|
251.082285(24)
|
16.8(2) min
|
β−
|
251Bk
|
(1/2+)
|
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 known nuclide to undergo cluster decay
Côté, Benoit; Eichler, Marius; Yagüe López, Andrés; Vassh, Nicole; Mumpower, Matthew R.; Világos, Blanka; Soós, Benjámin; Arcones, Almudena; Sprouse, Trevor M.; Surman, Rebecca; Pignatari, Marco; Pető, Mária K.; Wehmeyer, Benjamin; Rauscher, Thomas; Lugaro, Maria. 129 I and 247 Cm in meteorites constrain the last astrophysical source of solar r-process elements. Science. 26 February 2021, 371 (6532): 945–948. PMID 33632846. S2CID 232050526. arXiv:2006.04833
. doi:10.1126/science.aba1111.
- 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).
- 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 (頁面存檔備份,存於網際網路檔案館), Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (頁面存檔備份,存於網際網路檔案館) (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.