锿的同位素
锿有从240Es至257Es共18种同位素，其中252Es最稳定，半衰期471.7日（1.291年）。
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图表
| 符号 | Z | N | 同位素质量（u） [n 1][n 2] |
半衰期 [n 1][n 2] |
衰变 方式[1] |
衰变 产物 |
原子核 自旋[n 1] |
|---|---|---|---|---|---|---|---|
| 激发能量[n 1][n 2] | |||||||
| 240Es | 99 | 141 | 240.06892(43)# | 1# s | α | 236Bk | |
| β+ （不常见） | 240Cf | ||||||
| 241Es | 99 | 142 | 241.06854(24)# | 10(5) s [8(+6−5) s] |
α | 237Bk | (3/2−) |
| β+ （不常见） | 241Cf | ||||||
| 242Es | 99 | 143 | 242.06975(35)# | 13.5(25) s | α (99.94%) | 238Bk | |
| β+, SF (.6%) | (various) | ||||||
| β+ （不常见） | 242Cf | ||||||
| 243Es | 99 | 144 | 243.06955(25)# | 21(2) s | β+ (70%) | 243Cf | 3/2−# |
| α (30%) | 239Bk | ||||||
| 244Es | 99 | 145 | 244.07088(20)# | 37(4) s | β+ (94.69%) | 244Cf | |
| α (5.3%) | 240Bk | ||||||
| β+, SF (.01%) | (various) | ||||||
| 245Es | 99 | 146 | 245.07132(22)# | 1.1(1) min | β+ (60%) | 245Cf | (3/2−) |
| α (40%) | 241Bk | ||||||
| 246Es | 99 | 147 | 246.07290(24)# | 7.7(5) min | β+ (90.1%) | 246Cf | 4−# |
| α (9.9%) | 242Bk | ||||||
| β+, SF (.003%) | (various) | ||||||
| 247Es | 99 | 148 | 247.07366(3)# | 4.55(26) min | β+ (93%) | 247Cf | 7/2+# |
| α (7%) | 243Bk | ||||||
| SF (9×10−5%) | (various) | ||||||
| 248Es | 99 | 149 | 248.07547(6)# | 27(5) min | β+ (99.75%) | 248Cf | 2−#,0+# |
| α (.25%) | 244Bk | ||||||
| β+, SF (3×10−5%) | (various) | ||||||
| 249Es | 99 | 150 | 249.07641(3)# | 102.2(6) min | β+ (99.43%) | 249Cf | 7/2+ |
| α (.57%) | 245Bk | ||||||
| 250Es | 99 | 151 | 250.07861(11)# | 8.6(1) h | β+ (97%) | 250Cf | (6+) |
| α (3%) | 246Bk | ||||||
| 250mEs | 200(150)# keV | 2.22(5) h | ε (99%) | 250Cf | 1(−) | ||
| α (1%) | 246Bk | ||||||
| 251Es | 99 | 152 | 251.079992(7) | 33(1) h | ε (99.51%) | 251Cf | (3/2−) |
| α (.49%) | 247Bk | ||||||
| 252Es | 99 | 153 | 252.08298(5) | 471.7(19) d | α (76%) | 248Bk | (5−) |
| ε (24%) | 252Cf | ||||||
| β− (.01%) | 252Fm | ||||||
| 253Es[n 3] | 99 | 154 | 253.0848247(28) | 20.47(3) d | α | 249Bk | 7/2+ |
| SF (8.7×10−6%) | (various) | ||||||
| 254Es | 99 | 155 | 254.088022(5) | 275.7(5) d | α | 250Bk | (7+) |
| ε (10−4%) | 254Cf | ||||||
| SF (3×10−6%) | (various) | ||||||
| β− (1.74×10−6%) | 254Fm | ||||||
| 254mEs | 84.2(25) keV | 39.3(2) h | β− (98%) | 254Fm | 2+ | ||
| IT (3%) | 254Es | ||||||
| α (.33%) | 250Bk | ||||||
| ε (.078%) | 254Cf | ||||||
| SF (.0045%) | (various) | ||||||
| 255Es | 99 | 156 | 255.090273(12) | 39.8(12) d | β− (92%) | 255Fm | (7/2+) |
| α (8%) | 251Bk | ||||||
| SF (.0041%) | (various) | ||||||
| 256Es | 99 | 157 | 256.09360(11)# | 25.4(24) min | β− | 256Fm | (1+,0−) |
| 256mEs | 0(100)# keV | 7.6 h | β− (99.99%) | 256Fm | (8+) | ||
| β−, SF (.002%) | (various) | ||||||
| 257Es | 99 | 158 | 257.09598(44)# | 7.7(2) d | β− | 257Fm | 7/2+# |
| α | 253Bk | ||||||
| 258Es | 99 | 159 | 258.09952(32)# | 3# min | |||
| ← | 同位素列表 | → |
| 锎的同位素 | 锿的同位素 | 镄的同位素 |
参考文献
- ^ Universal Nuclide Chart. nucleonica. [2015-11-03]. （原始内容
存档于2017-02-19）.
- 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 （页面存档备份，存于互联网档案馆）, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database （页面存档备份，存于互联网档案馆） (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.