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Isotopes of einsteinium
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Einsteinium (99Es) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be discovered (in nuclear fallout from the Ivy Mike H-bomb test) was 253Es in 1952. There are 18 known radioisotopes, from 240Es to 257Es, and 8 nuclear isomers. The longest-lived isotope is 252Es with a half-life of 471.7 days or 1.291 years; the second longest, 254Es with half-life of 275.7 days is more available.
List of isotopes
Einsteinium-239
|-id=Einsteinium-240 | α (70%)
| 236Bk |
|---|
| β+ (30%) |
| 240Cf |
| - |
| β+, SF (0.16%) |
| (various) |
| -id=Einsteinium-241 |
| 241Es |
| 241.06859(25)# |
| | α | 237Bk | 3/2−# |-id=Einsteinium-242 | β+
| 242Cf |
|---|
| α (41%) |
| 238Bk |
| - |
| β+, SF (1.5%) |
| (various) |
| -id=Einsteinium-243 |
| α (61%) |
| 239Bk |
| - |
| β+? (39%) |
| 243Cf |
| -id=Einsteinium-243m |
| IT? |
| 243Es |
| - |
| α? |
| 239Bk |
| - |
| β+? |
| 243Cf |
| -id=Einsteinium-244 |
| β+ (95%) |
| 244Cf |
| - |
| α (5%) |
| 240Bk |
| - |
| β+, SF (0.011%) |
| (various) |
| -id=Einsteinium-245 |
| β+ (51%) |
| 245Cf |
| - |
| α (49%) |
| 241Bk |
| -id=Einsteinium-245m |
| IT? |
| 245Es |
| - |
| α? |
| 241Bk |
| - |
| β+? |
| 245Cf |
| -id=Einsteinium-246 |
| β+ (90.1%) |
| 246Cf |
| - |
| α (9.9%) |
| 242Bk |
| - |
| β+, SF (0.003%) |
| (various) |
| -id=Einsteinium-247 |
| β+ (93%) |
| 247Cf |
| - |
| α (7%) |
| 243Bk |
| -id=Einsteinium-247m |
| IT? |
| 247Es |
| - |
| α? |
| 243Bk |
| - |
| β+ |
| 247Cf |
| -id=Einsteinium-248 |
| β+ (99.75%) |
| 248Cf |
| - |
| α (0.25%) |
| 244Bk |
| - |
| β+, SF (3.5×10−4%) |
| (various) |
| -id=Einsteinium-249 |
| β+ (99.43%) |
| 249Cf |
| - |
| α (0.57%) |
| 245Bk |
| -id=Einsteinium-250 |
| 250Es |
| 250.07861(11)# |
| | β+ | 250Cf | 6(+) |-id=Einsteinium-250m | | β+ | 250Cf | 1(−) |-id=Einsteinium-251 | EC (99.5%)
| 251Cf |
|---|
| α (0.5%) |
| 247Bk |
| -id=Einsteinium-251m |
| IT? |
| 251Es |
| - |
| EC? |
| 251Cf |
| -id=Einsteinium-252 |
| α (78%) |
| 248Bk |
| - |
| EC (22%) |
| 252Cf |
| -id=Einsteinium-253 |
| α |
| 249Bk |
| - |
| SF (8.7×10−6%) |
| (various) |
| -id=Einsteinium-253m |
| 10# μs |
| IT? |
| 253Es |
| 3/2−# |
| -id=Einsteinium-254 |
| αTheoretically capable of electron capture to 254Cf |
| 250Bk |
| - |
| β− (1.74×10−4%) |
| 254Fm |
| - |
| SF (−6%) |
| (various) |
| -id=Einsteinium-254m |
| β− (98%) |
| 254Fm |
| - |
| IT ( |
| 254Es |
| - |
| α (0.32%) |
| 250Bk |
| - |
| EC (0.076%) |
| 254Cf |
| - |
| SF ( |
| (various) |
| -id=Einsteinium-255 |
| β− (92.0%) |
| 255Fm |
| - |
| α (8.0%) |
| 251Bk |
| - |
| SF (0.0041%) |
| (various) |
| -id=Einsteinium-256 |
| β− |
| 256Fm |
| - |
| β−, SF (0.002%) |
| (various) |
| -id=Einsteinium-256m |
| | β− | 256Fm | 0+# |-id=Einsteinium-257 | 257Es | 257.09598(44)# | | β− | 257Fm | 7/2+#
References
References
- (1 October 2020). "Search for Electron-Capture Delayed Fission in the New Isotope 244Md". Physical Review Letters.
- (2024-03-18). "Decay properties of the neutron-deficient isotope Es 242". Physical Review C.
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