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Argon-32

Properties and data of the isotope 32Ar.


Contents

See also: list of Argon isotopes.

 

General data

Name of the isotope:Argon-32; Ar-32Symbol:32Ar or 3218ArMass number A:32 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:14Isotopic mass:31.9976378(19) u (atomic weight of Argon-32)Nuclide mass:31.9877635 u (calculated nuclear mass without electrons)Mass excess:-2.20038 MeVMass defect:0.2645216 u (per nucleus)Nuclear binding energy:246.40028327 MeV (per nucleus)
7.70000885 MeV (average binding energy per nucleon)
Separation energy:SN = 21.60(20) MeV (first neutron)
SP = 2.455(4) MeV (first proton)
Half-life:98(2) msDecay constant λ:7.072930413877 s-1Specific activity α:1.374005911125 × 10+23 Bq g-1
3713529489528.9 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Charge radius:3.3468(62) femtometer fmMirror nucleus:Silicon-32Year of discovery:1977

 

Radioactive Decay

Half-life T½ = 98(2) ms respectively 9.8 × 10-2 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+32Cl64.42(22) %11.13475 MeV
ε, p31S35.58(22) %9.555 MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 32) with Argon-32. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 14Isobar A = 32
519B
620C
721N
822O
923F
1024Ne32Ne
1125Na32Na
1226Mg32Mg
1327Al32Al
1428Si32Si
1529P32P
1630S32S
1731Cl32Cl
1832Ar32Ar
1933K32K
2034Ca

 

External data and identifiers

Adopted Levels, Gammas:NuDat 32Ar

 


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Last update: 2023-10-04


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