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Isotopes of curium

Artificial nuclides with atomic number of 96 but with different mass numbers

Artificial nuclides with atomic number of 96 but with different mass numbers

Curium (Cm) 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 Cm in 1944, which has 146 neutrons.

There are 19 known radioisotopes ranging from Cm to Cm. There are also ten known nuclear isomers. The longest-lived isotope is Cm, 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. It is followed by Cm, which has a half-life of 348,000 years. The longest-lived known isomer is Cm with a half-life of 1.12 seconds.

List of isotopes

Curium-231

|-id=Curium-233 | β (80%)

Am
α (20%)
Pu
-id=Curium-234
β (71%)
Am
-
α (27%)
Pu
-
SF (2%)
(various)
-id=Curium-235
β? (96%)
Am
-
α (4%)
Pu
-id=Curium-236
β (82%)
Am
-
α (18%)
Pu
-id=Curium-237
Cm
237.05287(8)
10# min
α (?%)
Pu
5/2+#
-id=Curium-238
EC? (96.11%)
Am
-
α (3.84%)
Pu
-
SF (0.048%)
(various)
-id=Curium-239
β
Am
-
α (6.2x10%)
Pu
-id=Curium-240
α
Pu
-
SF (3.9×10%)
(various)
-id=Curium-241
EC (99.0%)
Am
-
α (1.0%)
Pu
-id=Curium-242
α
Pu
-
SF (6.2×10%)
(various)
-
CD (1.1×10%)Heaviest known nuclide to undergo cluster decay
Pb
Si
-id=Curium-242m
SF?
(various)
-
IT?
Cm
-id=Curium-243
α (99.71%)
Pu
-
EC (0.29%)
Am
-
SF (5.3×10%)
(various)
-id=Curium-243m

| | IT | Cm | 1/2+ |-id=Curium-244 | α

Pu
SF (1.37×10%)
(various)
-id=Curium-244m1

| | IT | Cm | 6+ |-id=Curium-244m2 | 500 ns | SF | (various) | |-id=Curium-245 | α

Pu
SF (6.1×10%)
(various)
-id=Curium-245m

| | IT | Cm | 1/2+ |-id=Curium-246 | α (99.97%)

Pu
SF (0.02615%)
(various)
-id=Curium-246m

| | IT | Cm | 8− |-id=Curium-247 | Cm | 247.070353(4) | | α | Pu | 9/2− |-id=Curium-247m1 | | IT | Cm | 5/2+ |-id=Curium-247m2 | | IT | Cm | 1/2+ |-id=Curium-248 | α (91.61%)

Pu
SF (8.39%)
(various)
-id=Curium-248m

| | IT | Cm | 8−# |-id=Curium-249 | Cm | 249.0759540(25) | | β | Bk | 1/2+ |-id=Curium-249m | | | | 7/2+ |-id=Curium-250 | SFThe nuclide with the lowest atomic number known (almost surely) to undergo spontaneous fission as the main decay mode

(various)
α (?%)
Pu
-
β (?%)
Bk
-id=Curium-251
Cm
251.082285(24)

| | β | Bk | (3/2+)

Actinides vs fission products

References

Isotope masses from:

    • Half-life, spin, and isomer data selected from the following sources.

    References

    1. (26 February 2021). "129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements". Science.
    2. (2014). "Short-Lived Radionuclides and Early Solar System Chronology". Treatise on Geochemistry.
    3. "Adopted Levels for 250Cm". NNDC Chart of Nuclides.
    Info: Wikipedia Source

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