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Isotopes of fermium
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<h2 id="list-of-isotopes">List of isotopes</h2> <table><tbody><tr><th rowspan="2">Nuclide<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a></th><th rowspan="1"><a href="/facts/Atomic_number/bgAr581S"><i>Z</i></a></th><th rowspan="1"><a href="/facts/Neutron_number/eNtwGnVL"><i>N</i></a></th><th rowspan="1"><a href="/facts/Atomic_mass/J1FJY9MV">Isotopic mass</a> (<a href="/facts/Dalton_(unit)/IMATU3vf">Da</a>)<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a><a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></th><th rowspan="2"><a href="/facts/Half-life/kGVH8BAB">Half-life</a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></th><th rowspan="2"><a href="/facts/Decay_mode/Ya6FVjt4">Decaymode</a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></th><th rowspan="2"><a href="/facts/Decay_product/hT0obfLv">Daughterisotope</a></th><th rowspan="2"><a href="/facts/Spin_(particle_physics)/4Jvp7e8P">Spin</a> and<a href="/facts/Parity_(physics)/emSbJ4hD">parity</a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a><a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></th></tr><tr><th colspan="3">Excitation energy</th></tr><tr><td rowspan="3">241Fm</td><td rowspan="3">100</td><td rowspan="3">141</td><td rowspan="3">241.07431(32)#</td><td rowspan="3">730(60) μs</td><td><a href="/facts/Spontaneous_fission/0QuJoVKI">SF</a>?</td><td>(various)</td><td rowspan="3">5/2+#</td></tr><tr><td><a href="/facts/Alpha_decay/rCsHNIUE">α</a> (<14%)</td><td>237Cf</td></tr><tr><td><a href="/facts/Beta_decay/vxTBlckp">β+</a> (<12%)</td><td>241Es</td></tr><tr><td rowspan="2">242Fm</td><td rowspan="2">100</td><td rowspan="2">142</td><td rowspan="2">242.07343(43)#</td><td rowspan="2">0.8(2) ms</td><td>SF</td><td>(various)</td><td rowspan="2">0+</td></tr><tr><td>α?</td><td>238Cf</td></tr><tr><td rowspan="3">243Fm<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a></td><td rowspan="3">100</td><td rowspan="3">143</td><td rowspan="3">243.07441(14)#</td><td rowspan="3">231(9) ms</td><td>α (91%)</td><td>239Cf</td><td rowspan="3">(7/2−)</td></tr><tr><td>SF (9%)</td><td>(various)</td></tr><tr><td>β+?</td><td>243Es</td></tr><tr><td rowspan="3">244Fm</td><td rowspan="3">100</td><td rowspan="3">144</td><td rowspan="3">244.07404(22)#</td><td rowspan="3">3.12(8) ms</td><td>SF (>97%)</td><td>(various)</td><td rowspan="3">0+</td></tr><tr><td>β+ (<2%)</td><td>244Es</td></tr><tr><td>α (<1%)</td><td>240Cf</td></tr><tr><td rowspan="3">245Fm<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a></td><td rowspan="3">100</td><td rowspan="3">145</td><td rowspan="3">245.07535(21)#</td><td rowspan="3">4.2(13) s</td><td>α (88.5%)</td><td>241Cf</td><td rowspan="3">(1/2+)</td></tr><tr><td>β+ (11.5%)</td><td>245Es</td></tr><tr><td>SF (<0.3%)<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></td><td>(various)</td></tr><tr><td rowspan="3">246Fm</td><td rowspan="3">100</td><td rowspan="3">146</td><td rowspan="3">246.075350(17)</td><td rowspan="3">1.54(4) s</td><td>α (93.2%)</td><td>242Cf</td><td rowspan="3">0+</td></tr><tr><td>SF (6.8%)</td><td>(various)</td></tr><tr><td><a href="/facts/Electron_capture/EIccoV1u">EC</a> (<1.3%)</td><td>246Es</td></tr><tr><td rowspan="2">247Fm</td><td rowspan="2">100</td><td rowspan="2">147</td><td rowspan="2">247.07694(19)#</td><td rowspan="2">31(1) s</td><td>α (~64%)</td><td>243Cf</td><td rowspan="2">(7/2+)</td></tr><tr><td>β+? (~36%)</td><td>247Es</td></tr><tr><td rowspan="3">247mFm</td><td rowspan="3" colspan="3">49(8) keV</td><td rowspan="3">5.1(2) s</td><td>α (88%)</td><td>243Cf</td><td rowspan="3">(1/2+)</td></tr><tr><td><a href="/facts/Isomeric_transition/L8DHcqnk">IT</a>?</td><td>247Fm</td></tr><tr><td>β+?</td><td>247Es</td></tr><tr><td rowspan="3">248Fm</td><td rowspan="3">100</td><td rowspan="3">148</td><td rowspan="3">248.0771855(91)</td><td rowspan="3">34.5(12) s</td><td>α (99.9%)</td><td>244Cf</td><td rowspan="3">0+</td></tr><tr><td>SF (0.1%)</td><td>(various)</td></tr><tr><td>β+?</td><td>248Es</td></tr><tr><td rowspan="3">248mFm</td><td rowspan="3" colspan="3">1200(100)# keV</td><td rowspan="3">10.1(6) ms</td><td>IT?</td><td>248Fm</td><td rowspan="3">6+#</td></tr><tr><td>α?</td><td>244Cf</td></tr><tr><td>β+?</td><td>248Es</td></tr><tr><td rowspan="2">249Fm</td><td rowspan="2">100</td><td rowspan="2">149</td><td rowspan="2">249.0789260(67)</td><td rowspan="2">1.6(1) min</td><td>β+? (67%)</td><td>249Es</td><td rowspan="2">7/2+</td></tr><tr><td>α (33%)</td><td>245Cf</td></tr><tr><td rowspan="3">250Fm</td><td rowspan="3">100</td><td rowspan="3">150</td><td rowspan="3">250.0795198(85)</td><td rowspan="3">31.0(11) min</td><td>α (99.99%)</td><td>246Cf</td><td rowspan="3">0+</td></tr><tr><td>SF (6.9×10−3%)</td><td>(various)</td></tr><tr><td><a href="/facts/Electron_capture/EIccoV1u">EC</a>?</td><td>250Es</td></tr><tr><td rowspan="4">250mFm</td><td rowspan="4" colspan="3">1199.2(10) keV</td><td rowspan="4">1.92(5) s</td><td>IT</td><td>250Fm</td><td rowspan="4">(8−)</td></tr><tr><td>α?</td><td>246Cf</td></tr><tr><td>β+?</td><td>250Es</td></tr><tr><td>SF?</td><td>(various)</td></tr><tr><td rowspan="2">251Fm</td><td rowspan="2">100</td><td rowspan="2">151</td><td rowspan="2">251.081545(15)</td><td rowspan="2">5.30(8) h</td><td>β+ (98.20%)</td><td>251Es</td><td rowspan="2">9/2−</td></tr><tr><td>α (1.80%)</td><td>247Cf</td></tr><tr><td>251mFm</td><td colspan="3">200.0(1) keV</td><td>21.8(8) μs</td><td>IT</td><td>251Fm</td><td>5/2+</td></tr><tr><td rowspan="2">252Fm</td><td rowspan="2">100</td><td rowspan="2">152</td><td rowspan="2">252.0824660(56)</td><td rowspan="2">25.39(4) h</td><td>α (99.99%)<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></td><td>248Cf</td><td rowspan="2">0+</td></tr><tr><td>SF (.0023%)</td><td>(various)</td></tr><tr><td rowspan="2">253Fm</td><td rowspan="2">100</td><td rowspan="2">153</td><td rowspan="2">253.0851809(16)</td><td rowspan="2">3.00(12) d</td><td>EC (88%)</td><td>253Es</td><td rowspan="2">1/2+</td></tr><tr><td>α (12%)</td><td>249Cf</td></tr><tr><td>253mFm</td><td colspan="3">351(6) keV</td><td>0.56(6) μs</td><td>IT</td><td>253Fm</td><td>11/2-#</td></tr><tr><td rowspan="2">254Fm</td><td rowspan="2">100</td><td rowspan="2">154</td><td rowspan="2">254.0868524(20)</td><td rowspan="2">3.240(2) h</td><td>α (99.94%)</td><td>250Cf</td><td rowspan="2">0+</td></tr><tr><td>SF (0.0592%)</td><td>(various)</td></tr><tr><td rowspan="2">255Fm</td><td rowspan="2">100</td><td rowspan="2">155</td><td rowspan="2">255.0899635(42)</td><td rowspan="2">20.07(7) h</td><td>α</td><td>251Cf</td><td rowspan="2">7/2+</td></tr><tr><td>SF (2.4×10−5%)</td><td>(various)</td></tr><tr><td rowspan="2">256Fm</td><td rowspan="2">100</td><td rowspan="2">156</td><td rowspan="2">256.0917717(32)</td><td rowspan="2">157.1(13) min</td><td>SF (91.9%)</td><td>(various)</td><td rowspan="2">0+</td></tr><tr><td>α (8.1%)</td><td>252Cf</td></tr><tr><td rowspan="2">257Fm<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></td><td rowspan="2">100</td><td rowspan="2">157</td><td rowspan="2">257.0951054(47)</td><td rowspan="2">100.5(2) d</td><td>α (99.79%)</td><td>253Cf</td><td rowspan="2">9/2+</td></tr><tr><td>SF (.210%)</td><td>(various)</td></tr><tr><td rowspan="2">258Fm</td><td rowspan="2">100</td><td rowspan="2">158</td><td rowspan="2">258.09708(22)#</td><td rowspan="2">370(14) μs</td><td>SF</td><td>(various)</td><td rowspan="2">0+</td></tr><tr><td>α?</td><td>254Cf</td></tr><tr><td>259Fm</td><td>100</td><td>159</td><td>259.10060(30)#</td><td>1.5(2) s</td><td>SF</td><td>(various)</td><td>3/2+#</td></tr><tr><td>260Fm<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a><a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></td><td>100</td><td>160</td><td>260.10281(47)#</td><td>1# min</td><td>SF</td><td>(various)</td><td>0+</td></tr><tr><th colspan="20"><i>This table header & footer:</i> <ul><li>view</li></ul></th></tr></tbody></table> <h2 id="chronology-of-isotope-discovery">Chronology of isotope discovery</h2> <table><tbody><tr><th>Isotope</th><th>Discovered</th><th>Reaction</th></tr><tr><td>241Fm</td><td>2008</td><td>204Pb(40Ar,3n)</td></tr><tr><td>242Fm</td><td>1975</td><td>204Pb(40Ar,2n), 206Pb(40Ar,4n)</td></tr><tr><td>243Fm</td><td>1981</td><td>206Pb(40Ar,3n)</td></tr><tr><td>244Fm</td><td>1967</td><td>233U(16O,5n)</td></tr><tr><td>245Fm</td><td>1967</td><td>233U(16O,4n)</td></tr><tr><td>246Fm</td><td>1966</td><td>235U(16O,5n)</td></tr><tr><td>247Fm</td><td>1967</td><td>239Pu(12C,4n)</td></tr><tr><td>248Fm</td><td>1958</td><td>240Pu(12C,4n)</td></tr><tr><td>249Fm</td><td>1960</td><td>238U(16O,5n)</td></tr><tr><td>250Fm</td><td>1954</td><td>238U(16O,4n)</td></tr><tr><td>251Fm</td><td>1957</td><td>249Cf(α,2n)</td></tr><tr><td>252Fm</td><td>1956</td><td>249Cf(α,n)</td></tr><tr><td>253Fm</td><td>1957</td><td>252Cf(α,3n)</td></tr><tr><td>254Fm</td><td>1954</td><td>Neutron capture</td></tr><tr><td>255Fm</td><td>1954</td><td>Neutron capture</td></tr><tr><td>256Fm</td><td>1955</td><td>Neutron capture</td></tr><tr><td>257Fm</td><td>1964</td><td>Neutron capture</td></tr><tr><td>258Fm</td><td>1971</td><td>257Fm(d,p)</td></tr><tr><td>259Fm</td><td>1980</td><td>257Fm(t,p)</td></tr><tr><td>260Fm?</td><td>1992?</td><td>254Es+18O, 22Ne — transfer (EC of 260Md)</td></tr></tbody></table> <p>260Fm was not confirmed in 1997. </p> <ul><li>Isotope masses from: <ul><li>M. Wang; G. Audi; A. H. Wapstra; F. G. Kondev; M. MacCormick; X. Xu; et al. (2012). <a href="http://amdc.in2p3.fr/masstables/Ame2012/Ame2012b-v2.pdf">"The AME2012 atomic mass evaluation (II). Tables, graphs and references"</a> (PDF). <i>Chinese Physics C</i>. 36 (12): 1603–2014. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2012ChPhC..36....3M">2012ChPhC..36....3M</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1088%2F1674-1137%2F36%2F12%2F003">10.1088/1674-1137/36/12/003</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:250839471">250839471</a>.</li> <li>Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/facts/Aaldert_Wapstra/9Ylvt18s">Wapstra, Aaldert Hendrik</a> (2003), <a href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The NUBASE evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, 729: 3–128, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></li></ul></li> <li>Half-life, spin, and isomer data selected from the following sources. <ul><li>Audi, G.; Kondev, F. G.; Wang, M.; Pfeiffer, B.; Sun, X.; Blachot, J.; MacCormick, M. (2012). <a href="https://web.archive.org/web/20140222061704/http://amdc.in2p3.fr/nubase/Nubase2012-v3.pdf">"The NUBASE2012 evaluation of nuclear properties"</a> (PDF). <i>Chinese Physics C</i>. 36 (12): 1157–1286. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2012ChPhC..36....1A">2012ChPhC..36....1A</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1088%2F1674-1137%2F36%2F12%2F001">10.1088/1674-1137/36/12/001</a>. Archived from <a href="http://amdc.in2p3.fr/nubase/Nubase2012-v3.pdf">the original</a> (PDF) on 2014-02-22.</li> <li>Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/facts/Aaldert_Wapstra/9Ylvt18s">Wapstra, Aaldert Hendrik</a> (2003), <a href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The NUBASE evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, 729: 3–128, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></li> <li><a href="/facts/National_Nuclear_Data_Center/SgVzvxLk">National Nuclear Data Center</a>. <a href="http://www.nndc.bnl.gov/nudat2/">"NuDat 2.x database"</a>. <a href="/facts/Brookhaven_National_Laboratory/L2JrG0K1">Brookhaven National Laboratory</a>.</li> <li>Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). <i><a href="/facts/CRC_Handbook_of_Chemistry_and_Physics/qjxzC2Cu">CRC Handbook of Chemistry and Physics</a></i> (85th ed.). <a href="/facts/Boca_Raton%2c_Florida/9gcNen3S">Boca Raton, Florida</a>: <a href="/facts/CRC_Press/duTuH4hz">CRC Press</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-8493-0485-9.</li> <li>M. Thoennessen (2012). "Discovery of Isotopes of Elements with Z≥100". <i>Atomic Data and Nuclear Data Tables</i>. 99 (3): 312–344. <a href="/facts/ArXiv_(identifier)/H6EtgnBe">arXiv</a>:<a href="https://arxiv.org/abs/1203.2105">1203.2105</a>. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2013ADNDT..99..312T">2013ADNDT..99..312T</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.adt.2012.03.003">10.1016/j.adt.2012.03.003</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:94982856">94982856</a>.</li></ul></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>mFm – Excited nuclear isomer. <a href="/wiki/Nuclear_isomer" target="_blank">/wiki/Nuclear_isomer</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p># – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS). <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Modes of decay: EC:Electron captureIT:Isomeric transitionSF:Spontaneous fission <a href="/wiki/Electron_capture" target="_blank">/wiki/Electron_capture</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>( ) spin value – Indicates spin with weak assignment arguments. <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Khuyagbaatar, J.; Heßberger, F. P.; Hofmann, S.; Ackermann, D.; Burkhard, H. G.; Heinz, S.; Kindler, B.; Kojouharov, I.; Lommel, B.; Mann, R.; Maurer, J.; Nishio, K. (12 October 2020). "α decay of Fm 243 143 and Fm 245 145 , and of their daughter nuclei". Physical Review C. 102 (4): 044312. doi:10.1103/PhysRevC.102.044312. ISSN 2469-9985. S2CID 241259726. Retrieved 24 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.102.044312" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.102.044312</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Tezekbayeva, M. S.; Yeremin, A. V.; Svirikhin, A. I.; Lopez-Martens, A.; Chelnokov, M. L.; Chepigin, V. I.; Isaev, A. V.; Izosimov, I. N.; Karpov, A. V.; Kuznetsova, A. A.; Malyshev, O. N.; Mukhin, R. S.; Popeko, A. G.; Popov, Yu. A.; Rachkov, V. A.; Sailaubekov, B. S.; Sokol, E. A.; Hauschild, K.; Jacob, H.; Chakma, R.; Dorvaux, O.; Forge, M.; Gall, B.; Kessaci, K.; Andel, B.; Antalic, S.; Bronis, A.; Mosat, P. (24 March 2022). "Study of the production and decay properties of neutron-deficient nobelium isotopes". The European Physical Journal A. 58 (3): 52. arXiv:2203.15659. Bibcode:2022EPJA...58...52T. doi:10.1140/epja/s10050-022-00707-9. ISSN 1434-601X. S2CID 247720708. Retrieved 24 June 2023. <a href="https://link.springer.com/article/10.1140/epja/s10050-022-00707-9" target="_blank">https://link.springer.com/article/10.1140/epja/s10050-022-00707-9</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Khuyagbaatar, J.; Heßberger, F. P.; Hofmann, S.; Ackermann, D.; Burkhard, H. G.; Heinz, S.; Kindler, B.; Kojouharov, I.; Lommel, B.; Mann, R.; Maurer, J.; Nishio, K. (12 October 2020). "α decay of Fm 243 143 and Fm 245 145 , and of their daughter nuclei". Physical Review C. 102 (4): 044312. doi:10.1103/PhysRevC.102.044312. ISSN 2469-9985. S2CID 241259726. Retrieved 24 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.102.044312" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.102.044312</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Theoretically capable of β+β+ decay to 252Cf <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Heaviest nuclide produced via neutron capture <a href="/wiki/Neutron_capture" target="_blank">/wiki/Neutron_capture</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Discovery of this isotope is unconfirmed <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Not directly synthesized, occurs as decay product of 260Md <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> </ol>