Curium-246
Properties and data of the isotope 246Cm.
See also: List of individual Curium isotopes (and general data sources).
General data
Name of the isotope:Curium-246; Cm-246Symbol:246Cm or 24696CmMass number A:246 (= number of nucleons)Atomic number Z:96 (= number of protons)Neutrons N:150Isotopic mass:246.0672221(16) u (atomic weight of Curium-246)Nuclide mass:246.0145658 u (calculated nuclear mass without electrons)Mass excess:62.61698 MeVMass defect:1.983718372 u (per nucleus)Nuclear binding energy:1847.82176121 MeV (per nucleus)
7.51147057 MeV (average binding energy per nucleon)Separation energy:SN = 6.4589(12) MeV (first neutron)
SP = 6.5725(20) MeV (first proton)Half-life:4706(40) aDecay constant λ:4.67048838056 × 10-12 s-1Specific activity α:11433471102.631 Bq g-1
0.30901273250354 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.8562(184) femtometer fmYear of discovery:1954
Radioactive Decay
Half-life T½ = 4706(40) a respectively 1.4841 × 1011 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 242Pu | 99.97385(7) % | 5.4571(9) | |
| SZ | div | 0.02615(7) % | | |
Parent Nuclides
Direct parent isotopes are: 250Cf, 246Bk, 246Am.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 150) and isobaric (same nucleon number A = 246) with Curium-246. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 150 | Isobar A = 246 |
|---|
| 92 | 242U | |
| 93 | 243Np | |
| 94 | 244Pu | 246Pu |
| 95 | 245Am | 246Am |
| 96 | 246Cm | 246Cm |
| 97 | 247Bk | 246Bk |
| 98 | 248Cf | 246Cf |
| 99 | 249Es | 246Es |
| 100 | 250Fm | 246Fm |
| 101 | 251Md | 246Md |
| 102 | 252No | |
| 103 | 253Lr | |
| 104 | 254Rf | |
| 105 | 255Db | |
External data and identifiers
CAS:15757-90-1InChI Key:NIWWFAAXEMMFMS-BJUDXGSMSA-NSMILES:[246Cm]PubChem:ID 167396Adopted Levels, Gammas:NuDat 246Cm
Literature and References
[1] - F. G.Kondev, I. Ahmad, J. P. Greene, M. A. Kellett, A. L.Nichols:
Measurements of the half-life of 246Cm and the α-decay emission probabilities of 246Cm and 250Cf.
In: Applied Radiation and Isotopes, (2007), DOI 10.1016/j.apradiso.2006.08.011.
Last update: 2020-11-12
Perma link: https://www.chemlin.org/isotope/curium-246
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