Isotopes of einsteinium: Difference between revisions
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! <br />isotopic mass (u)<br /> |
! <br />isotopic mass (u)<br /> |
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! rowspan="2" | half-life |
! rowspan="2" | half-life |
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! rowspan="2" | decay<br>mode(s)<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">Abbreviations:<br>EC: [[Electron capture]]<br>IT: [[Isomeric transition]]<br>SF: [[Spontaneous fission]]</ref> |
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! rowspan="2" | daughter<br>isotope(s) |
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! rowspan="2" | nuclear<br />spin |
! rowspan="2" | nuclear<br />spin |
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|- |
|- |
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! colspan="3" | excitation energy |
! colspan="3" | excitation energy |
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|- |
|- |
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| <sup>240</sup>Es |
| rowspan=2|<sup>240</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=2 style="text-align:right" | 99 |
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| style="text-align:right" | 141 |
| rowspan=2 style="text-align:right" | 141 |
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| 240.06892(43)# |
| rowspan=2|240.06892(43)# |
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| 1# s |
| rowspan=2|1# s |
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| [[alpha decay|α]] |
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| |
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| <sup>236</sup>Bk |
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| rowspan=2| |
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|- |
|- |
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| <sup> |
| [[beta decay|β<sup>+</sup>]] (rare) |
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| <sup>240</sup>Cf |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 142 |
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| 241.06854(24)# |
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| 10(5) s [8(+6-5) s] |
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| (3/2-) |
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|- |
|- |
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| <sup> |
| rowspan=2|<sup>241</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=2 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 142 |
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| |
| rowspan=2|241.06854(24)# |
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| |
| rowspan=2|10(5) s<br>[8(+6-5) s] |
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| |
| α |
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| <sup>237</sup>Bk |
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| rowspan=2|(3/2-) |
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|- |
|- |
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| <sup> |
| β<sup>+</sup> (rare) |
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| <sup>241</sup>Cf |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 144 |
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| 243.06955(25)# |
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| 21(2) s |
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| 3/2-# |
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|- |
|- |
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| <sup> |
| rowspan=3|<sup>242</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=3 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=3 style="text-align:right" | 143 |
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| |
| rowspan=3|242.06975(35)# |
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| |
| rowspan=3|13.5(25) s |
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| α (99.94%) |
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| |
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| <sup>238</sup>Bk |
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| rowspan=3| |
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|- |
|- |
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| <sup> |
| β<sup>+</sup>, [[Spontaneous fission|SF]] (.6%) |
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| (various) |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 146 |
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| 245.07132(22)# |
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| 1.1(1) min |
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| (3/2-) |
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|- |
|- |
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| <sup> |
| β<sup>+</sup> (rare) |
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| <sup>242</sup>Cf |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 147 |
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| 246.07290(24)# |
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| 7.7(5) min |
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| 4-# |
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|- |
|- |
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| <sup> |
| rowspan=2|<sup>243</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=2 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 144 |
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| |
| rowspan=2|243.06955(25)# |
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| |
| rowspan=2|21(2) s |
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| β<sup>+</sup> (70%) |
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| 7/2+# |
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| <sup>243</sup>Cf |
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| rowspan=2|3/2-# |
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|- |
|- |
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| α (30%) |
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| <sup>248</sup>Es |
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| <sup>239</sup>Bk |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 149 |
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| 248.07547(6)# |
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| 27(5) min |
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| 2-#,0+# |
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|- |
|- |
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| <sup> |
| rowspan=3|<sup>244</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=3 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=3 style="text-align:right" | 145 |
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| |
| rowspan=3|244.07088(20)# |
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| |
| rowspan=3|37(4) s |
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| β<sup>+</sup> (94.69%) |
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| 7/2+ |
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| <sup>244</sup>Cf |
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| rowspan=3| |
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|- |
|- |
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| α (5.3%) |
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| <sup>250</sup>Es |
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| <sup>240</sup>Bk |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 151 |
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| 250.07861(11)# |
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| 8.6(1) h |
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| (6+) |
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|- |
|- |
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| |
| β<sup>+</sup>, SF (.01%) |
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| (various) |
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| colspan="3" style="text-indent:2em" | 200(150)# keV |
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| 2.22(5) h |
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| 1(-) |
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|- |
|- |
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| <sup> |
| rowspan=2|<sup>245</sup>Es |
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| style="text-align:right" | 99 |
| rowspan=2 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=2 style="text-align:right" | 146 |
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| rowspan=2|245.07132(22)# |
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| 251.079992(7) |
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| |
| rowspan=2|1.1(1) min |
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| β<sup>+</sup> (60%) |
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| (3/2-) |
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| <sup>245</sup>Cf |
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| rowspan=2|(3/2-) |
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|- |
|- |
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| α (40%) |
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| <sup>252</sup>Es |
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| <sup>241</sup>Bk |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 153 |
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| 252.08298(5) |
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| 471.7(19) d |
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| (5-) |
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|- |
|- |
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| rowspan=3|<sup>246</sup>Es |
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| <sup>253</sup>Es<ref group="n">Most common, and first-synthesized, isotope</ref> |
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| style="text-align:right" | 99 |
| rowspan=3 style="text-align:right" | 99 |
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| style="text-align:right" | |
| rowspan=3 style="text-align:right" | 147 |
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| rowspan=3|246.07290(24)# |
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| 253.0848247(28) |
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| |
| rowspan=3|7.7(5) min |
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| β<sup>+</sup> (90.1%) |
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| 7/2+ |
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| <sup>246</sup>Cf |
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| rowspan=3|4-# |
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|- |
|- |
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| α (9.9%) |
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| <sup>242</sup>Bk |
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|- |
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| β<sup>+</sup>, SF (.003%) |
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| (various) |
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|- |
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| rowspan=3|<sup>247</sup>Es |
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| rowspan=3 style="text-align:right" | 99 |
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| rowspan=3 style="text-align:right" | 148 |
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| rowspan=3|247.07366(3)# |
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| rowspan=3|4.55(26) min |
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| β<sup>+</sup> (93%) |
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| <sup>247</sup>Cf |
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| rowspan=3|7/2+# |
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|- |
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| α (7%) |
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| <sup>243</sup>Bk |
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|- |
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| SF (9E-5%) |
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| (various) |
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|- |
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| rowspan=3|<sup>248</sup>Es |
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| rowspan=3 style="text-align:right" | 99 |
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| rowspan=3 style="text-align:right" | 149 |
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| rowspan=3|248.07547(6)# |
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| rowspan=3|27(5) min |
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| β<sup>+</sup> (99.75%) |
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| <sup>248</sup>Cf |
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| rowspan=3|2-#,0+# |
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|- |
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| α (.25%) |
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| <sup>244</sup>Bk |
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|- |
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| β<sup>+</sup>, SF (3E-5%) |
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| (various) |
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|- |
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| rowspan=2|<sup>249</sup>Es |
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| rowspan=2 style="text-align:right" | 99 |
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| rowspan=2 style="text-align:right" | 150 |
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| rowspan=2|249.07641(3)# |
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| rowspan=2|102.2(6) min |
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| rowspan=2|7/2+ |
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|- |
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| α (.57%) |
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| <sup>245</sup>Bk |
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|- |
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| rowspan=2|<sup>250</sup>Es |
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| rowspan=2 style="text-align:right" | 99 |
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| rowspan=2 style="text-align:right" | 151 |
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| rowspan=2|250.07861(11)# |
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| rowspan=2|8.6(1) h |
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| β<sup>+</sup> (97%) |
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| <sup>250</sup>Cf |
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| rowspan=2|(6+) |
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|- |
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| α (3%) |
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| <sup>246</sup>Bk |
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|- |
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| rowspan=2 style="text-indent:1em" | <sup>250m</sup>Es |
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| rowspan=2 colspan="3" style="text-indent:2em" | 200(150)# keV |
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| rowspan=2|2.22(5) h |
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| [[Electron capture|EC]] (99%) |
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| <sup>250</sup>Cf |
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| rowspan=2|1(-) |
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|- |
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| α (1%) |
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| <sup>246</sup>Bk |
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|- |
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| rowspan=2|<sup>251</sup>Es |
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| rowspan=2 style="text-align:right" | 99 |
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| rowspan=2 style="text-align:right" | 152 |
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| rowspan=2|251.079992(7) |
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| rowspan=2|33(1) h |
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| EC (99.51%) |
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| <sup>251</sup>Cf |
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| rowspan=2|(3/2-) |
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|- |
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| α (.49%) |
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| <sup>247</sup>Bk |
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|- |
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| rowspan=3|<sup>252</sup>Es |
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| rowspan=3 style="text-align:right" | 99 |
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| rowspan=3 style="text-align:right" | 153 |
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| rowspan=3|252.08298(5) |
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| rowspan=3|471.7(19) d |
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| α (76%) |
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| <sup>248</sup>Bk |
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| rowspan=3|(5-) |
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|- |
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| EC (24%) |
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| <sup>252</sup>Cf |
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|- |
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| β<sup>-</sup> (.01%) |
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| <sup>252</sup>Fm |
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|- |
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| rowspan=2|<sup>253</sup>Es<ref group="n">Most common, and first-synthesized, isotope</ref> |
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| rowspan=2 style="text-align:right" | 99 |
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| rowspan=2 style="text-align:right" | 154 |
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| rowspan=2|253.0848247(28) |
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| rowspan=2|20.47(3) d |
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| α |
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| <sup>249</sup>Bk |
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| rowspan=2|7/2+ |
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|- |
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| SF (8.7E-6%) |
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| (various) |
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|- |
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| rowspan=4|<sup>254</sup>Es |
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| rowspan=4 style="text-align:right" | 99 |
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| rowspan=4 style="text-align:right" | 155 |
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| rowspan=4|254.088022(5) |
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| rowspan=4|275.7(5) d |
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| α |
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| <sup>250</sup>Bk |
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| rowspan=4|(7+) |
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|- |
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| EC (1E-4%) |
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| <sup>254</sup>Cf |
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|- |
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| SF (3E-6%) |
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| (various) |
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|- |
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| β<sup>-</sup> (1.74E-6%) |
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| <sup>254</sup>Fm |
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|- |
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| rowspan=5 style="text-indent:1em" | <sup>254m</sup>Es |
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| rowspan=5 colspan="3" style="text-indent:2em" | 84.2(25) keV |
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| rowspan=5|39.3(2) h |
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| β<sup>-</sup> (98%) |
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| <sup>254</sup>Fm |
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| rowspan=5|2+ |
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|- |
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| [[Isomeric transition|IT]] (3%) |
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| <sup>254</sup>Es |
| <sup>254</sup>Es |
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| style="text-align:right" | 99 |
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| style="text-align:right" | 155 |
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| 254.088022(5) |
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| 275.7(5) d |
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| (7+) |
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|- |
|- |
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| α (.33%) |
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| style="text-indent:1em" | <sup>254m</sup>Es |
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| <sup>250</sup>Bk |
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| colspan="3" style="text-indent:2em" | 84.2(25) keV |
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| 39.3(2) h |
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| 2+ |
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|- |
|- |
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| EC (.078%) |
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| <sup>255</sup>Es |
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| <sup>254</sup>Cf |
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| style="text-align:right" | 99 |
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|- |
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| style="text-align:right" | 156 |
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| SF (.0045%) |
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| 255.090273(12) |
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| |
| (various) |
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|- |
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| (7/2+) |
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| rowspan=3|<sup>255</sup>Es |
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| rowspan=3 style="text-align:right" | 99 |
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| rowspan=3 style="text-align:right" | 156 |
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| rowspan=3|255.090273(12) |
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| rowspan=3|39.8(12) d |
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| β<sup>-</sup> (92%) |
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| <sup>255</sup>Fm |
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| rowspan=3|(7/2+) |
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|- |
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| α (8%) |
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| <sup>251</sup>Bk |
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|- |
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| SF (.0041%) |
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| (various) |
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|- |
|- |
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| <sup>256</sup>Es |
| <sup>256</sup>Es |
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| 256.09360(11)# |
| 256.09360(11)# |
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| 25.4(24) min |
| 25.4(24) min |
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| β<sup>-</sup> |
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| <sup>256</sup>Fm |
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| (1+,0-) |
| (1+,0-) |
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|- |
|- |
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| style="text-indent:1em" | <sup>256m</sup>Es |
| rowspan=2 style="text-indent:1em" | <sup>256m</sup>Es |
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| colspan="3" style="text-indent:2em" | 0(100)# keV |
| rowspan=2 colspan="3" style="text-indent:2em" | 0(100)# keV |
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| 7.6 h |
| rowspan=2|7.6 h |
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| β<sup>-</sup> (99.99%) |
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| (8+) |
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| <sup>256</sup>Fm |
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| rowspan=2|(8+) |
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|- |
|- |
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| <sup> |
| β<sup>-</sup>, SF (.002%) |
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| (various) |
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| style="text-align:right" | 99 |
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|- |
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| style="text-align:right" | 158 |
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| rowspan=2|<sup>257</sup>Es |
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| 257.09598(44)# |
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| rowspan=2 style="text-align:right" | 99 |
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| 7.7(2) d |
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| rowspan=2 style="text-align:right" | 158 |
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| 7/2+# |
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| rowspan=2|257.09598(44)# |
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| rowspan=2|7.7(2) d |
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| β<sup>-</sup> |
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| <sup>257</sup>Fm |
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| rowspan=2|7/2+# |
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|- |
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| α |
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| <sup>253</sup>Bk |
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|- |
|- |
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| <sup>258</sup>Es |
| <sup>258</sup>Es |
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| 258.09952(32)# |
| 258.09952(32)# |
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| 3# min |
| 3# min |
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Revision as of 08:04, 22 May 2011
Einsteinium (Es) has no stable isotopes. There are 19 known radioisotopes from 240Es to 258Es, and 3 nuclear isomers (250mEs, 254mEs, and 256mEs) The longest-lived isotope is 252Es with a half-life of 471.7 days. A standard atomic mass cannot be given due to Einsteinium being an artificial element.
Table
nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[1][n 1] |
daughter isotope(s) |
nuclear spin |
---|---|---|---|---|---|---|---|
excitation energy | |||||||
240Es | 99 | 141 | 240.06892(43)# | 1# s | α | 236Bk | |
β+ (rare) | 240Cf | ||||||
241Es | 99 | 142 | 241.06854(24)# | 10(5) s [8(+6-5) s] |
α | 237Bk | (3/2-) |
β+ (rare) | 241Cf | ||||||
242Es | 99 | 143 | 242.06975(35)# | 13.5(25) s | α (99.94%) | 238Bk | |
β+, SF (.6%) | (various) | ||||||
β+ (rare) | 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 (9E-5%) | (various) | ||||||
248Es | 99 | 149 | 248.07547(6)# | 27(5) min | β+ (99.75%) | 248Cf | 2-#,0+# |
α (.25%) | 244Bk | ||||||
β+, SF (3E-5%) | (various) | ||||||
249Es | 99 | 150 | 249.07641(3)# | 102.2(6) min | 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 | EC (99%) | 250Cf | 1(-) | ||
α (1%) | 246Bk | ||||||
251Es | 99 | 152 | 251.079992(7) | 33(1) h | EC (99.51%) | 251Cf | (3/2-) |
α (.49%) | 247Bk | ||||||
252Es | 99 | 153 | 252.08298(5) | 471.7(19) d | α (76%) | 248Bk | (5-) |
EC (24%) | 252Cf | ||||||
β- (.01%) | 252Fm | ||||||
253Es[n 2] | 99 | 154 | 253.0848247(28) | 20.47(3) d | α | 249Bk | 7/2+ |
SF (8.7E-6%) | (various) | ||||||
254Es | 99 | 155 | 254.088022(5) | 275.7(5) d | α | 250Bk | (7+) |
EC (1E-4%) | 254Cf | ||||||
SF (3E-6%) | (various) | ||||||
β- (1.74E-6%) | 254Fm | ||||||
254mEs | 84.2(25) keV | 39.3(2) h | β- (98%) | 254Fm | 2+ | ||
IT (3%) | 254Es | ||||||
α (.33%) | 250Bk | ||||||
EC (.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 |
- ^ Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission - ^ Most common, and first-synthesized, isotope
Notes
- Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.
References
- Isotope masses from:
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
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: CS1 maint: multiple names: authors list (link)
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
- Isotopic compositions and standard atomic masses from:
- J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
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: CS1 maint: multiple names: authors list (link) - M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
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- J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.
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: CS1 maint: multiple names: authors list (link) - National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005.
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(help) - N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.
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- G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.