Isotopes of einsteinium: Difference between revisions

Latest revision as of 17:27, 25 June 2025

Template:Short description Template:Infobox einsteinium isotopes 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 around 1.293 years.

List of isotopes

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Template:Isotopes table |-id=Einsteinium-240 | rowspan=3|²⁴⁰Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 141 | rowspan=3|240.06895(39)# | rowspan=3|Template:Val | α (70%) | ²³⁶Bk | rowspan=3|4−# |- | β⁺ (30%) | ²⁴⁰Cf |- | β⁺, SF (0.16%) | (various) |-id=Einsteinium-241 | ²⁴¹Es | style="text-align:right" | 99 | style="text-align:right" | 142 | 241.06859(25)# | Template:Val^[1] | α | ²³⁷Bk | 3/2−# |-id=Einsteinium-242 | rowspan=3|²⁴²Es^[2] | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 143 | rowspan=3|242.06957(28)# | rowspan=3|Template:Val | β⁺ | ²⁴²Cf | rowspan=3|2+# |- | α (41%) | ²³⁸Bk |- | β⁺, SF (1.5%) | (various) |-id=Einsteinium-243 | rowspan=2|²⁴³Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 144 | rowspan=2|243.06951(22)# | rowspan=2|Template:Val | α (61%) | ²³⁹Bk | rowspan=2|(7/2+) |- | β⁺? (39%) | ²⁴³Cf |-id=Einsteinium-243m | rowspan=3 style="text-indent:1em" | ^243mEs^{[n 1]} | rowspan=3 colspan=3 style="text-indent:2em" | 50(50)# keV | rowspan=3|>50# μs | IT? | ²⁴³Es | rowspan=3|3/2−# |- | α? | ²³⁹Bk |- | β⁺? | ²⁴³Cf |-id=Einsteinium-244 | rowspan=3|²⁴⁴Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 145 | rowspan=3|244.07088(20)# | rowspan=3|Template:Val | β⁺ (95%) | ²⁴⁴Cf | rowspan=3|6+# |- | α (5%) | ²⁴⁰Bk |- | β⁺, SF (0.011%) | (various) |-id=Einsteinium-245 | rowspan=2|²⁴⁵Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 146 | rowspan=2|245.07119(18)# | rowspan=2|Template:Val | β⁺ (51%) | ²⁴⁵Cf | rowspan=2|(3/2−) |- | α (49%) | ²⁴¹Bk |-id=Einsteinium-245m | rowspan=3 style="text-indent:1em" | ^245mEs^{[n 1]} | rowspan=3 colspan="3" style="text-indent:2em" | 30(15)# keV | rowspan=3|>50# μs | IT? | ²⁴⁵Es | rowspan=3|7/2+# |- | α? | ²⁴¹Bk |- | β⁺? | ²⁴⁵Cf |-id=Einsteinium-246 | rowspan=3|²⁴⁶Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 147 | rowspan=3|246.07281(10) | rowspan=3|Template:Val | β⁺ (90.1%) | ²⁴⁶Cf | rowspan=3|4−# |- | α (9.9%) | ²⁴²Bk |- | β⁺, SF (0.003%) | (various) |-id=Einsteinium-247 | rowspan=2|²⁴⁷Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 148 | rowspan=2|247.073622(21) | rowspan=2|Template:Val | β⁺ (93%) | ²⁴⁷Cf | rowspan=2|(7/2+) |- | α (7%) | ²⁴³Bk |-id=Einsteinium-247m | rowspan=3 style="text-indent:1em" | ^247mEs^{[n 1]} | rowspan=3 colspan=3 style="text-indent:2em" | 50(50)# keV | rowspan=3|>20# μs | IT? | ²⁴⁷Es | rowspan=3|(3/2−) |- | α? | ²⁴³Bk |- | β⁺ | ²⁴⁷Cf |-id=Einsteinium-248 | rowspan=3|²⁴⁸Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 149 | rowspan=3|248.07547(6)# | rowspan=3|Template:Val | β⁺ (99.75%) | ²⁴⁸Cf | rowspan=3|2−# |- | α (0.25%) | ²⁴⁴Bk |- | β⁺, SF (3.5×10⁻⁴%) | (various) |-id=Einsteinium-249 | rowspan=2|²⁴⁹Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 150 | rowspan=2|249.07641(3)# | rowspan=2|Template:Val | β⁺ (99.43%) | ²⁴⁹Cf | rowspan=2|7/2+ |- | α (0.57%) | ²⁴⁵Bk |-id=Einsteinium-250 | ²⁵⁰Es | style="text-align:right" | 99 | style="text-align:right" | 151 | 250.07861(11)# | Template:Val | β⁺ | ²⁵⁰Cf | 6(+) |-id=Einsteinium-250m | style="text-indent:1em" | ^250mEs^{[n 1]} | colspan="3" style="text-indent:2em" | 200(150)# keV | Template:Val | β⁺ | ²⁵⁰Cf | 1(−) |-id=Einsteinium-251 | rowspan=2|²⁵¹Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 152 | rowspan=2|251.079991(6) | rowspan=2|Template:Val | EC (99.5%) | ²⁵¹Cf | rowspan=2|3/2− |- | α (0.5%) | ²⁴⁷Bk |-id=Einsteinium-251m | rowspan=2 style="text-indent:1em" | ^251mEs | rowspan=2 colspan=3 style="text-indent:2em" | 8.4(10) keV | rowspan=2 | >200# μs | IT? | ²⁵¹Es | rowspan=2|(7/2+) |- | EC? | ²⁵¹Cf |-id=Einsteinium-252 | rowspan=2|²⁵²Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 153 | rowspan=2|252.08298(5) | rowspan=2|Template:Val | α (78%) | ²⁴⁸Bk | rowspan=2|(4+) |- | EC (22%) | ²⁵²Cf |-id=Einsteinium-253 | rowspan=2|²⁵³Es^{[n 2]} | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 154 | rowspan=2|253.0848212(13) | rowspan=2|Template:Val | α | ²⁴⁹Bk | rowspan=2|7/2+ |- | SF (8.7×10⁻⁶%) | (various) |-id=Einsteinium-253m | style="text-indent:1em" | ^253mEs | colspan=3 style="text-indent:2em" | 106(4) keV | >10# μs | IT? | ²⁵³Es | 3/2−# |-id=Einsteinium-254 | rowspan=3|²⁵⁴Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 155 | rowspan=3|254.088024(3) | rowspan=3|Template:Val | αTemplate:R | ²⁵⁰Bk | rowspan=3|7+ |- | β⁻ (1.74×10⁻⁴%) | ²⁵⁴Fm |- | SF (<3×10⁻⁶%) | (various) |-id=Einsteinium-254m | rowspan=5 style="text-indent:1em" | ^254mEs | rowspan=5 colspan="3" style="text-indent:2em" | 80.4(11) keV | rowspan=5|Template:Val | β⁻ (98%) | ²⁵⁴Fm | rowspan=5|2+ |- | IT (<3%) | ²⁵⁴Es |- | α (0.32%) | ²⁵⁰Bk |- | EC (0.076%) | ²⁵⁴Cf |- | SF (<0.045%) | (various) |-id=Einsteinium-255 | rowspan=3|²⁵⁵Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 156 | rowspan=3|255.090274(12) | rowspan=3|Template:Val | β⁻ (92.0%) | ²⁵⁵Fm | rowspan=3|(7/2+) |- | α (8.0%) | ²⁵¹Bk |- | SF (0.0041%) | (various) |-id=Einsteinium-256 | rowspan=2|²⁵⁶Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 157 | rowspan=2| 256.09360(11)# | rowspan=2|Template:Val | β⁻ | ²⁵⁶Fm | rowspan=2|7+# |- | β⁻, SF (0.002%) | (various) |-id=Einsteinium-256m | style="text-indent:1em" |^256mEs^{[n 1]} | colspan="3" style="text-indent:2em" | 0(100)# keV | Template:Val | β⁻ | ²⁵⁶Fm | 0+# |-id=Einsteinium-257 | ²⁵⁷Es | style="text-align:right" | 99 | style="text-align:right" | 158 | 257.09598(44)# | Template:Val | β⁻ | ²⁵⁷Fm | 7/2+# Template:Isotopes table/footer

References

Template:Reflist

Isotope masses from:
- Template:NUBASE 2003
Half-life, spin, and isomer data selected from the following sources.

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@@ Line 1: / Line 1: @@
 {{Short description|none}}
 {{Infobox einsteinium isotopes}}
-[[Einsteinium]] (<sub>99</sub>Es) is a [[synthetic element]], and thus a [[standard atomic weight]] cannot be given. Like all synthetic elements, it has no [[stable isotope]]s. The first [[isotope]] to be discovered (in [[nuclear fallout]] from the [[Ivy Mike]] [[thermonuclear weapon|H-bomb]] [[nuclear testing|test]]) was <sup>253</sup>Es in 1952. There are 18 known [[radioisotope]]s from <sup>240</sup>Es to <sup>257</sup>Es, and 4 [[nuclear isomer]]s. The longest-lived isotope is <sup>252</sup>Es with a [[half-life]] of 471.7 days, or around 1.293 years.
+[[Einsteinium]] (<sub>99</sub>Es) is a [[synthetic element]], and thus a [[standard atomic weight]] cannot be given. Like all synthetic elements, it has no [[stable isotope]]s. The first [[isotope]] to be discovered (in [[nuclear fallout]] from the [[Ivy Mike]] [[thermonuclear weapon|H-bomb]] [[nuclear testing|test]]) was <sup>253</sup>Es in 1952. There are 18 known [[radioisotope]]s from <sup>240</sup>Es to <sup>257</sup>Es, and 8 [[nuclear isomer]]s. The longest-lived isotope is <sup>252</sup>Es with a [[half-life]] of 471.7 days, or around 1.293 years.
 == List of isotopes ==
-{{Anchor|Einsteinium-239|Einsteinium-243m|Einsteinium-247m|Einsteinium-251m|Einsteinium-253m|Einsteinium-258}}
+{{Anchor|Einsteinium-239|Einsteinium-258}}
 <!--Please delete anchor(s) from the list above or table below if adding a dedicated isotope section(s).-->
@@ Line 18: / Line 18: @@
 | rowspan=3 style="text-align:right" | 141
 | rowspan=3|240.06895(39)#
-| rowspan=3|6.0(17)&nbsp;s
+| rowspan=3|{{val|6.0|(17)|u=s}}
 | [[alpha decay|α]] (70%)
 | <sup>236</sup>Bk
@@ Line 29: / Line 29: @@
 | (various)
 |-id=Einsteinium-241
-| rowspan=2|<sup>241</sup>Es<ref>{{cite journal |last1=Khuyagbaatar |first1=J. |last2=Albers |first2=H. M. |last3=Block |first3=M. |last4=Brand |first4=H. |last5=Cantemir |first5=R. A. |last6=Di Nitto |first6=A. |last7=Düllmann |first7=Ch. E. |last8=Götz |first8=M. |last9=Götz |first9=S. |last10=Heßberger |first10=F. P. |last11=Jäger |first11=E. |last12=Kindler |first12=B. |last13=Kratz |first13=J. V. |last14=Krier |first14=J. |last15=Kurz |first15=N. |last16=Lommel |first16=B. |last17=Lens |first17=L. |last18=Mistry |first18=A. |last19=Schausten |first19=B. |last20=Uusitalo |first20=J. |last21=Yakushev |first21=A. |title=Search for Electron-Capture Delayed Fission in the New Isotope <sup>244</sup>Md |journal=Physical Review Letters |date=1 October 2020 |volume=125 |issue=14 |pages=142504 |doi=10.1103/PhysRevLett.125.142504 |pmid=33064498 |bibcode=2020PhRvL.125n2504K |s2cid=223546973 |url=http://urn.fi/URN:NBN:fi:jyu-202010066084 }}</ref>
+| <sup>241</sup>Es
-| rowspan=2 style="text-align:right" | 99
+| style="text-align:right" | 99
-| rowspan=2 style="text-align:right" | 142
+| style="text-align:right" | 142
-| rowspan=2|241.06859(25)#
+| 241.06859(25)#
-| rowspan=2|{{val|4.3|2.4|1.2|u=s}}
+| {{val|4.3|2.4|1.2|u=s}}<ref>{{cite journal |last1=Khuyagbaatar |first1=J. |last2=Albers |first2=H. M. |last3=Block |first3=M. |last4=Brand |first4=H. |last5=Cantemir |first5=R. A. |last6=Di Nitto |first6=A. |last7=Düllmann |first7=Ch. E. |last8=Götz |first8=M. |last9=Götz |first9=S. |last10=Heßberger |first10=F. P. |last11=Jäger |first11=E. |last12=Kindler |first12=B. |last13=Kratz |first13=J. V. |last14=Krier |first14=J. |last15=Kurz |first15=N. |last16=Lommel |first16=B. |last17=Lens |first17=L. |last18=Mistry |first18=A. |last19=Schausten |first19=B. |last20=Uusitalo |first20=J. |last21=Yakushev |first21=A. |title=Search for Electron-Capture Delayed Fission in the New Isotope <sup>244</sup>Md |journal=Physical Review Letters |date=1 October 2020 |volume=125 |issue=14 |pages=142504 |doi=10.1103/PhysRevLett.125.142504 |pmid=33064498 |bibcode=2020PhRvL.125n2504K |s2cid=223546973 |url=http://urn.fi/URN:NBN:fi:jyu-202010066084 }}</ref>
 | α
 | <sup>237</sup>Bk
-| rowspan=2|3/2−#
+| 3/2−#
-|-
-| β<sup>+</sup>?
-| <sup>241</sup>Cf
 |-id=Einsteinium-242
 | rowspan=3|<sup>242</sup>Es<ref>{{cite journal | last=Khuyagbaatar | first=J. | last2=Cantemir | first2=R. A. | last3=Düllmann | first3=Ch. E. | last4=Jäger | first4=E. | last5=Kindler | first5=B. | last6=Krier | first6=J. | last7=Kurz | first7=N. | last8=Lommel | first8=B. | last9=Schausten | first9=B. | last10=Yakushev | first10=A. | title=Decay properties of the neutron-deficient isotope Es 242 | journal=Physical Review C | volume=109 | issue=3 | date=2024-03-18 | issn=2469-9985 | doi=10.1103/PhysRevC.109.034311| arxiv=2408.01714 }}</ref>
@@ Line 45: / Line 42: @@
 | rowspan=3 style="text-align:right" | 143
 | rowspan=3|242.06957(28)#
-| rowspan=3|16.9(8)&nbsp;s
+| rowspan=3|{{val|16.9|(8)|u=s}}
 | β<sup>+</sup>
 | <sup>242</sup>Cf
@@ Line 60: / Line 57: @@
 | rowspan=2 style="text-align:right" | 144
 | rowspan=2|243.06951(22)#
-| rowspan=2|22.1(14)&nbsp;s
+| rowspan=2|{{val|22.1|(14)|u=s}}
 | α (61%)
 | <sup>239</sup>Bk
 | rowspan=2|(7/2+)
 |-
-| β<sup>+</sup> (39%)
+| β<sup>+</sup>? (39%)
+| <sup>243</sup>Cf
+|-id=Einsteinium-243m
+| rowspan=3 style="text-indent:1em" | <sup>243m</sup>Es<ref group="n" name="order">Order of ground state and isomer is uncertain.</ref>
+| rowspan=3 colspan=3 style="text-indent:2em" | 50(50)#&nbsp;keV
+| rowspan=3|>50#&nbsp;μs
+| [[Isomeric transition|IT]]?
+| <sup>243</sup>Es
+| rowspan=3|3/2−#
+|-
+| α?
+| <sup>239</sup>Bk
+|-
+| β<sup>+</sup>?
 | <sup>243</sup>Cf
 |-id=Einsteinium-244
@@ Line 72: / Line 82: @@
 | rowspan=3 style="text-align:right" | 145
 | rowspan=3|244.07088(20)#
-| rowspan=3|37(4)&nbsp;s
+| rowspan=3|{{val|37|(4)|u=s}}
 | β<sup>+</sup> (95%)
 | <sup>244</sup>Cf
@@ Line 87: / Line 97: @@
 | rowspan=2 style="text-align:right" | 146
 | rowspan=2|245.07119(18)#
-| rowspan=2|1.11(6)&nbsp;min
+| rowspan=2|{{val|1.11|(6)|u=min}}
 | β<sup>+</sup> (51%)
 | <sup>245</sup>Cf
@@ Line 95: / Line 105: @@
 | <sup>241</sup>Bk
 |-id=Einsteinium-245m
-| rowspan=3 style="text-indent:1em" | <sup>245m</sup>Es<ref group="n" name="order">Order of ground state and isomer is uncertain.</ref>
+| rowspan=3 style="text-indent:1em" | <sup>245m</sup>Es<ref group="n" name="order"/>
 | rowspan=3 colspan="3" style="text-indent:2em" | 30(15)#&nbsp;keV
 | rowspan=3|>50#&nbsp;μs
@@ Line 111: / Line 121: @@
 | rowspan=3 style="text-align:right" | 99
 | rowspan=3 style="text-align:right" | 147
-| rowspan=3|246.072806(97)
+| rowspan=3|246.07281(10)
-| rowspan=3|7.5(5)&nbsp;min
+| rowspan=3|{{val|7.5|(5)|u=min}}
 | β<sup>+</sup> (90.1%)
 | <sup>246</sup>Cf
@@ Line 120: / Line 130: @@
 | <sup>242</sup>Bk
 |-
-| β<sup>+</sup>, SF (.003%)
+| β<sup>+</sup>, SF (0.003%)
 | (various)
 |-id=Einsteinium-247
-| rowspan=3|<sup>247</sup>Es
+| rowspan=2|<sup>247</sup>Es
-| rowspan=3 style="text-align:right" | 99
+| rowspan=2 style="text-align:right" | 99
-| rowspan=3 style="text-align:right" | 148
+| rowspan=2 style="text-align:right" | 148
-| rowspan=3|247.073622(21)
+| rowspan=2|247.073622(21)
-| rowspan=3|4.55(26)&nbsp;min
+| rowspan=2|{{val|4.55|(26)|u=min}}
 | β<sup>+</sup> (93%)
 | <sup>247</sup>Cf
-| rowspan=3|(7/2+)
+| rowspan=2|(7/2+)
 |-
 | α (7%)
 | <sup>243</sup>Bk
+|-id=Einsteinium-247m
+| rowspan=3 style="text-indent:1em" | <sup>247m</sup>Es<ref group="n" name="order" />
+| rowspan=3 colspan=3 style="text-indent:2em" | 50(50)#&nbsp;keV
+| rowspan=3|>20#&nbsp;μs
+| IT?
+| <sup>247</sup>Es
+| rowspan=3|(3/2−)
 |-
-| SF?
+| α?
-| (various)
+| <sup>243</sup>Bk
+|-
+| β<sup>+</sup>
+| <sup>247</sup>Cf
 |-id=Einsteinium-248
 | rowspan=3|<sup>248</sup>Es
 | rowspan=3 style="text-align:right" | 99
 | rowspan=3 style="text-align:right" | 149
-| rowspan=3|248.075469(56)#
+| rowspan=3|248.07547(6)#
-| rowspan=3|24(3)&nbsp;min
+| rowspan=3|{{val|24|(3)|u=min}}
 | β<sup>+</sup> (99.75%)
 | <sup>248</sup>Cf
 | rowspan=3|2−#
 |-
-| α (.25%)
+| α (0.25%)
 | <sup>244</sup>Bk
 |-
@@ Line 156: / Line 176: @@
 | rowspan=2 style="text-align:right" | 99
 | rowspan=2 style="text-align:right" | 150
-| rowspan=2|249.076409(32)#
+| rowspan=2|249.07641(3)#
-| rowspan=2|102.2(6)&nbsp;min
+| rowspan=2|{{val|102.2|(6)|u=min}}
 | β<sup>+</sup> (99.43%)
 | <sup>249</sup>Cf
 | rowspan=2|7/2+
 |-
-| α (.57%)
+| α (0.57%)
 | <sup>245</sup>Bk
 |-id=Einsteinium-250
-| rowspan=2|<sup>250</sup>Es
+| <sup>250</sup>Es
-| rowspan=2 style="text-align:right" | 99
+| style="text-align:right" | 99
-| rowspan=2 style="text-align:right" | 151
+| style="text-align:right" | 151
-| rowspan=2|250.07861(11)#
+| 250.07861(11)#
-| rowspan=2|8.6(1)&nbsp;h
+| {{val|8.6|(1)|u=h}}
 | β<sup>+</sup>
 | <sup>250</sup>Cf
-| rowspan=2|6(+)
+| 6(+)
-|-
-| α?
-| <sup>246</sup>Bk
 |-id=Einsteinium-250m
-| rowspan=2 style="text-indent:1em" | <sup>250m</sup>Es<ref group="n" name="order"/>
+| style="text-indent:1em" | <sup>250m</sup>Es<ref group="n" name="order"/>
-| rowspan=2 colspan="3" style="text-indent:2em" | 200(150)#&nbsp;keV
+| colspan="3" style="text-indent:2em" | 200(150)#&nbsp;keV
-| rowspan=2|2.22(5)&nbsp;h
+| {{val|2.22|(5)|u=h}}
 | β<sup>+</sup>
 | <sup>250</sup>Cf
-| rowspan=2|1(−)
+| 1(−)
-|-
-| α?
-| <sup>246</sup>Bk
 |-id=Einsteinium-251
 | rowspan=2|<sup>251</sup>Es
 | rowspan=2 style="text-align:right" | 99
 | rowspan=2 style="text-align:right" | 152
-| rowspan=2|251.0799914(57)
+| rowspan=2|251.079991(6)
-| rowspan=2|33(1)&nbsp;h
+| rowspan=2|{{val|33|(1)|u=h}}
 | [[Electron capture|EC]] (99.5%)
 | <sup>251</sup>Cf
 | rowspan=2|3/2−
 |-
-| α (.5%)
+| α (0.5%)
 | <sup>247</sup>Bk
+|-id=Einsteinium-251m
+| rowspan=2 style="text-indent:1em" | <sup>251m</sup>Es
+| rowspan=2 colspan=3 style="text-indent:2em" | 8.4(10)&nbsp;keV
+| rowspan=2 | >200#&nbsp;μs
+| IT?
+| <sup>251</sup>Es
+| rowspan=2|(7/2+)
+|-
+| EC?
+| <sup>251</sup>Cf
 |-id=Einsteinium-252
 | rowspan=2|<sup>252</sup>Es
 | rowspan=2 style="text-align:right" | 99
 | rowspan=2 style="text-align:right" | 153
-| rowspan=2|252.082979(54)
+| rowspan=2|252.08298(5)
-| rowspan=2|471.7(19)&nbsp;d
+| rowspan=2|{{val|471.7|(19)|u=d}}
-| α (78(2)%)
+| α (78%)
 | <sup>248</sup>Bk
 | rowspan=2|(4+)
 |-
-| EC (22(2)%)
+| EC (22%)
 | <sup>252</sup>Cf
 |-id=Einsteinium-253
@@ Line 215: / Line 239: @@
 | rowspan=2 style="text-align:right" | 154
 | rowspan=2|253.0848212(13)
-| rowspan=2|20.47(3)&nbsp;d
+| rowspan=2|{{val|20.47|(3)|u=d}}
 | α
 | <sup>249</sup>Bk
@@ Line 222: / Line 246: @@
 | SF (8.7×10<sup>−6</sup>%)
 | (various)
+|-id=Einsteinium-253m
+| style="text-indent:1em" | <sup>253m</sup>Es
+| colspan=3 style="text-indent:2em" | 106(4)&nbsp;keV
+| >10#&nbsp;μs
+| IT?
+| <sup>253</sup>Es
+| 3/2−#
 |-id=Einsteinium-254
 | rowspan=3|<sup>254</sup>Es
 | rowspan=3 style="text-align:right" | 99
 | rowspan=3 style="text-align:right" | 155
-| rowspan=3|254.0880243(32)
+| rowspan=3|254.088024(3)
-| rowspan=3|275.7(5)&nbsp;d
+| rowspan=3|{{val|275.7|(5)|u=d}}
 | α{{r|g=n|EC254|r=Theoretically capable of electron capture to <sup>254</sup>Cf{{NUBASE2020|ref}}}}
-| <sup>250</sup>Bk
+| <sup>250</sup>Bk<!-- According to NUBASE, 254Es favors α decay to 250m2Bk -->
 | rowspan=3|7+
 |-
@@ Line 240: / Line 271: @@
 | rowspan=5 style="text-indent:1em" | <sup>254m</sup>Es
 | rowspan=5 colspan="3" style="text-indent:2em" | 80.4(11)&nbsp;keV
-| rowspan=5|39.3(2)&nbsp;h
+| rowspan=5|{{val|39.3|(2)|u=h}}
-| β<sup>−</sup> (98(2)%)
+| β<sup>−</sup> (98%)
 | <sup>254</sup>Fm
 | rowspan=5|2+
@@ Line 248: / Line 279: @@
 | <sup>254</sup>Es
 |-
-| α (0.32(1)%)
+| α (0.32%)
 | <sup>250</sup>Bk
 |-
-| EC (0.076(7)%)
+| EC (0.076%)
 | <sup>254</sup>Cf
 |-
@@ Line 261: / Line 292: @@
 | rowspan=3 style="text-align:right" | 156
 | rowspan=3|255.090274(12)
-| rowspan=3|39.8(12)&nbsp;d
+| rowspan=3|{{val|39.8|(12)|u=d}}
 | β<sup>−</sup> (92.0%)
 | <sup>255</sup>Fm
@@ Line 269: / Line 300: @@
 | <sup>251</sup>Bk
 |-
-| SF (.0041%)
+| SF (0.0041%)
 | (various)
 |-id=Einsteinium-256
@@ Line 276: / Line 307: @@
 | rowspan=2 style="text-align:right" | 157
 | rowspan=2| 256.09360(11)#
-| rowspan=2|7.6 h
+| rowspan=2|{{val|7.6|u=h}}
 | β<sup>−</sup>
 | <sup>256</sup>Fm
 | rowspan=2|7+#
 |-
-| β<sup>−</sup>, SF (.002%)
+| β<sup>−</sup>, SF (0.002%)
 | (various)
 |-id=Einsteinium-256m
 | style="text-indent:1em" |<sup>256m</sup>Es<ref group="n" name="order"/>
 | colspan="3" style="text-indent:2em" | 0(100)#&nbsp;keV
-| 25.4(12)&nbsp;min
+| {{val|25.4|(12)|u=min}}
 | β<sup>−</sup>
 | <sup>256</sup>Fm
 | 0+#
 |-id=Einsteinium-257
-| rowspan=2|<sup>257</sup>Es
+| <sup>257</sup>Es
-| rowspan=2 style="text-align:right" | 99
+| style="text-align:right" | 99
-| rowspan=2 style="text-align:right" | 158
+| style="text-align:right" | 158
-| rowspan=2|257.09598(44)#
+| 257.09598(44)#
-| rowspan=2|7.7(2)&nbsp;d
+| {{val|7.7|(2)|u=d}}
 | β<sup>−</sup>
 | <sup>257</sup>Fm
-| rowspan=2|7/2+#
+| 7/2+#
-|-
-| α?
-| <sup>253</sup>Bk
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Isotopes of einsteinium: Difference between revisions

Latest revision as of 17:27, 25 June 2025

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