Americium-223
Properties and data of the isotope 223Am.
See also: list of Americium isotopes.
General data
Name of the isotope:Americium-223; Am-223Symbol:223Am or 22395AmMass number A:223 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:128Isotopic mass:223 u (atomic weight of Americium-223)Nuclide mass:222.9478921 u (calculated nuclear mass without electrons)Mass excess:0 MeVMass defect:1.852487288 u (per nucleus)Nuclear binding energy:1725.58079385 MeV (per nucleus)
7.73803047 MeV (average binding energy per nucleon)Half-life:5(+12-4) msDecay constant λ:138.62943611199 s-1Specific activity α:3.743703998206 × 10+23 Bq g-1
10118118914071 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:2015
Radioactive Decay
Half-life T½ = 5(+12-4) ms respectively 5 × 10-3 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 219Np | ca. 100 % | 17.4 MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 128) and isobaric (same nucleon number A = 223) with Americium-223. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 128 | Isobar A = 223 |
|---|
| 77 | 205Ir | |
| 78 | 206Pt | |
| 79 | 207Au | |
| 80 | 208Hg | |
| 81 | 209Tl | |
| 82 | 210Pb | |
| 83 | 211Bi | 223Bi |
| 84 | 212Po | 223Po |
| 85 | 213At | 223At |
| 86 | 214Rn | 223Rn |
| 87 | 215Fr | 223Fr |
| 88 | 216Ra | 223Ra |
| 89 | 217Ac | 223Ac |
| 90 | 218Th | 223Th |
| 91 | 219Pa | 223Pa |
| 92 | 220U | 223U |
| 95 | 223Am | 223Am |
Literature and References
[1] - H. M.Devaraja et al.:
Observation of new neutron-deficient isotopes with Z ≥ 92 in multinucleon transfer reactions.
In: Physics Letters B, (2015), DOI 10.1016/j.physletb.2015.07.006.
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/americium-223
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