Английская Википедия:Isotopes of curium

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Шаблон:Short description Шаблон:Infobox curium isotopes Curium (₉₆Cm) is an artificial element with an atomic number of 96. Because it is an artificial element, a standard atomic weight cannot be given, and it has no stable isotopes. The first isotope synthesized was ²⁴²Cm in 1944, which has 146 neutrons.

There are 19 known radioisotopes ranging from ²³³Cm to ²⁵¹Cm. There are also ten known nuclear isomers. The longest-lived isotope is ²⁴⁷Cm, with half-life 15.6 million years – orders of magnitude longer than that of any known isotope beyond curium, and long enough to study as a possible extinct radionuclide that would be produced by the r-process. The longest-lived isomer is ^246mCm with a half-life of 1.12 seconds.

List of isotopes

Шаблон:Isotopes table |- | rowspan=2|²³³Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 137 | rowspan=2|233.05077(8) | rowspan=2|Шаблон:Val | β⁺ (80%) | ²³³Am | rowspan=2|3/2+# |- | α (20%) | ²²⁹Pu |- | rowspan=3|²³⁴Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 138 | rowspan=3|234.05016(2) | rowspan=3|52(9) s | β⁺ (71%) | ²³⁴Am | rowspan=3|0+ |- | α (27%) | ²³⁰Pu |- | SF (2%) | (various) |- | rowspan=2|²³⁵Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 139 | rowspan=2|235.05143(22)# | rowspan=2|Шаблон:Val | β⁺ (99.0%) | ²³⁵Am | rowspan=2|(5/2+) |- | α (1.0%) | ²³¹Pu |- | rowspan=3|²³⁶Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 140 | rowspan=3|236.05141(22)# | rowspan=3|6.8(8) min | β⁺ (82%) | ²³⁶Am | rowspan=3|0+ |- | α (18%) | ²³²Pu |- | SF (<0.1%) | (various) |- | rowspan=2|²³⁷Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 141 | rowspan=2|237.05290(22)# | rowspan=2|>660 s | β⁺ | ²³⁷Am | rowspan=2|(5/2+) |- | α (<1%) | ²³³Pu |- | rowspan=2|²³⁸Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 142 | rowspan=2|238.05303(4) | rowspan=2|2.2(4) h | EC (~94%) | ²³⁸Am | rowspan=2|0+ |- | α (~6%) | ²³⁴Pu |- | rowspan=2|²³⁹CmШаблон:NUBASE2020 | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 143 | rowspan=2|239.05496(11)# | rowspan=2|2.5(4) h | β⁺ | ²³⁹Am | rowspan=2|(7/2−) |- | α (6.2x10⁻³%) | ²³⁵Pu |- | rowspan=3|²⁴⁰Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 144 | rowspan=3|240.0555295(25) | rowspan=3|27(1) d | α (99.5%) | ²³⁶Pu | rowspan=3|0+ |- | EC (.5%) | ²⁴⁰Am |- | SF (3.9×10⁻⁶%) | (various) |- | rowspan=2|²⁴¹Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 145 | rowspan=2|241.0576530(23) | rowspan=2|32.8(2) d | EC (99%) | ²⁴¹Am | rowspan=2|1/2+ |- | α (1%) | ²³⁷Pu |- | rowspan=3|²⁴²Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 146 | rowspan=3|242.0588358(20) | rowspan=3|162.8(2) d | αШаблон:R | ²³⁸Pu | rowspan=3|0+ |- | SF (6.33×10⁻⁶%) | (various) |- | CD (10⁻¹⁴%) | ²⁰⁸Pb
³⁴Si |- | style="text-indent:1em" | ^242mCm | colspan="3" style="text-indent:2em" | 2800(100) keV | 180(70) ns | | | |- | rowspan=3|²⁴³Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 147 | rowspan=3|243.0613891(22) | rowspan=3|29.1(1) y | α (99.71%) | ²³⁹Pu | rowspan=3|5/2+ |- | EC (.29%) | ²⁴³Am |- | SF (5.3×10⁻⁹%) | (various) |- | style="text-indent:1em" | ^243mCm | colspan="3" style="text-indent:2em" | 87.4(1) keV | 1.08(3) μs | IT | ²⁴³Cm | 1/2+ |- | rowspan=2|²⁴⁴Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 148 | rowspan=2|244.0627526(20) | rowspan=2|18.10(2) y | α | ²⁴⁰Pu | rowspan=2|0+ |- | SF (1.34×10⁻⁴%) | (various) |- | style="text-indent:1em" | ^244m1Cm | colspan="3" style="text-indent:2em" | 1040.188(12) keV | 34(2) ms | IT | ²⁴⁴Cm | 6+ |- | style="text-indent:1em" | ^244m2Cm | colspan="3" style="text-indent:2em" | 1100(900)# keV | >500 ns | SF | (various) | |- | rowspan=2|²⁴⁵Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 149 | rowspan=2|245.0654912(22) | rowspan=2|8.5(1)×10³ y | α | ²⁴¹Pu | rowspan=2|7/2+ |- | SF (6.1×10⁻⁷%) | (various) |- | style="text-indent:1em" | ^245mCm | colspan="3" style="text-indent:2em" | 355.92(10) keV | 290(20) ns | IT | ²⁴⁵Cm | 1/2+ |- | rowspan=2|²⁴⁶Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 150 | rowspan=2|246.0672237(22) | rowspan=2|4.76(4)×10³ y | α (99.97%) | ²⁴²Pu | rowspan=2|0+ |- | SF (.0261%) | (various) |- | style="text-indent:1em" | ^246mCm | colspan="3" style="text-indent:2em" | 1179.66(13) keV | 1.12(0.24) s | IT | ²⁴⁶Cm | 8- |- | ²⁴⁷Cm | style="text-align:right" | 96 | style="text-align:right" | 151 | 247.070354(5) | 1.56(5)×10⁷ y | α | ²⁴³Pu | 9/2− |- | style="text-indent:1em" | ^247m1Cm | colspan="3" style="text-indent:2em" | 227.38(19) keV | 26.3(0.3) μs | IT | ²⁴⁷Cm | 5/2+ |- | style="text-indent:1em" | ^247m2Cm | colspan="3" style="text-indent:2em" | 404.90(3) keV | 100.6(0.6) ns | IT | ²⁴⁷Cm | 1/2+ |- | rowspan=2|²⁴⁸Cm | rowspan=2 style="text-align:right" | 96 | rowspan=2 style="text-align:right" | 152 | rowspan=2|248.072349(5) | rowspan=2|3.48(6)×10⁵ y | α (91.74%) | ²⁴⁴Pu | rowspan=2|0+ |- | SF (8.26%) | (various) |- | style="text-indent:1em" | ^248mCm | colspan="3" style="text-indent:2em" | 1458.1(1) keV | 146(18) μs | IT | ²⁴⁸Cm | (8-) |- | ²⁴⁹Cm | style="text-align:right" | 96 | style="text-align:right" | 153 | 249.075953(5) | 64.15(3) min | β⁻ | ²⁴⁹Bk | 1/2(+) |- | style="text-indent:1em" | ^249mCm | colspan="3" style="text-indent:2em" | 48.758(17) keV | 23 μs | α | ²⁴⁵Pu | (7/2+) |- | rowspan=3|²⁵⁰Cm | rowspan=3 style="text-align:right" | 96 | rowspan=3 style="text-align:right" | 154 | rowspan=3|250.078357(12) | rowspan=3|8300# y | SF (74%) | (various) | rowspan=3|0+ |- | α (18%) | ²⁴⁶Pu |- | β⁻ (8%) | ²⁵⁰Bk |- | ²⁵¹Cm | style="text-align:right" | 96 | style="text-align:right" | 155 | 251.082285(24) | 16.8(2) min | β⁻ | ²⁵¹Bk | (1/2+) Шаблон:Isotopes table/footer

References

• Isotope masses from:
  • Шаблон:NUBASE 2003
• Half-life, spin, and isomer data selected from the following sources.
  • Шаблон:NUBASE 2003
  • Шаблон:NNDC
  • Шаблон:CRC85