Argon-44
Properties and data of the isotope 44Ar.
See also: list of Argon isotopes.
General data
Name of the isotope:Argon-44; Ar-44Symbol:44Ar or 4418ArMass number A:44 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:26Isotopic mass:43.9649238(17) u (atomic weight of Argon-44)Nuclide mass:43.9550495 u (calculated nuclear mass without electrons)Mass excess:-32.67327 MeVMass defect:0.401214592 u (per nucleus)Nuclear binding energy:373.72898516 MeV (per nucleus)
8.49384057 MeV (average binding energy per nucleon)Separation energy:SN = 8.735(6) MeV (first neutron)
SP = 15.80(6) MeV (first proton)Half-life:11.87(5) minDecay constant λ:0.00097324793675926 s-1Specific activity α:1.363031666699 × 10+19 Bq g-1
368386936.94576 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:3.4454(46) femtometer fmYear of discovery:1969
Radioactive Decay
Half-life T½ = 11.87(5) min (minutes) respectively 7.122 × 102 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 44K | 100 % | 3.1082(16) MeV | |
Parent Nuclides
Direct parent isotopes are: 44Cl, 45Cl.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 44) with Argon-44. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 26 | Isobar A = 44 |
11 | 37Na | |
12 | 38Mg | |
13 | 39Al | |
14 | 40Si | 44Si |
15 | 41P | 44P |
16 | 42S | 44S |
17 | 43Cl | 44Cl |
18 | 44Ar | 44Ar |
19 | 45K | 44K |
20 | 46Ca | 44Ca |
21 | 47Sc | 44Sc |
22 | 48Ti | 44Ti |
23 | 49V | 44V |
24 | 50Cr | 44Cr |
25 | 51Mn | 44Mn |
26 | 52Fe | |
27 | 53Co | |
28 | 54Ni | |
29 | 55Cu | |
30 | 56Zn | |
External data and identifiers
Last update: 2020-10-12
Perma link: https://www.chemlin.org/isotope/argon-44
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