镄的同位素
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图表
[编辑]| 符号 | Z | N | 同位素质量（u） [n 1][n 2] |
半衰期 [n 2] |
衰变 方式[1] |
衰变 产物 |
原子核 自旋[n 1] |
|---|---|---|---|---|---|---|---|
| 激发能量[n 2] | |||||||
| 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+ （不常见） | 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%) | 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%) | 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+ | ||
- ^ 1.0 1.1 画上#号的数据代表没有经过实验的证明，仅为理论推测。
- ^ 2.0 2.1 2.2 用括号括起来的数据代表不确定性。
- ^ Heaviest nuclide produced via neutron capture
- ^ Discovery of this isotope is unconfirmed
- ^ Not directly synthesized, occurs as decay product of 260Md
| ← | 同位素列表 | → |
| 锿的同位素 | 镄的同位素 | 钔的同位素 |
参考文献
[编辑]- ^ Universal Nuclide Chart. nucleonica. [2015-11-03]. （原始内容
存档于2017-02-19）.
- ^ Khuyagbaatar, J.; Hofmann, S.; Heßberger, F. P.; Ackermann, D.; Burkhard, H. G.; Heinz, S.; Kindler, B.; Kojouharov, I.; Lommel, B.; Mann, R.; Maurer, J.; Nishio, K.; Novikov, Yu. Spontaneous fission of neutron-deficient fermium isotopes and the new nucleus 241Fm (PDF). The European Physical Journal A. 1 August 2008, 37 (2): 177–183 [24 June 2023]. Bibcode:2008EPJA...37..177K. ISSN 1434-601X. S2CID 18977014. doi:10.1140/epja/i2008-10608-4 （英语）.
- 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.