Argon-43

Properties and data of the isotope ⁴³Ar.

Content

General data

Name of the isotope:Argon-43; Ar-43Symbol:⁴³Ar or 4318ArMass number A:43 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:25Isotopic mass:42.965636(6) u (atomic weight of Argon-43)Nuclide mass:42.9557617 u (calculated nuclear mass without electrons)Mass excess:-32.00986 MeVMass defect:0.39183747599999 u (per nucleus)Nuclear binding energy:364.99425787 MeV (per nucleus)
8.48823856 MeV (average binding energy per nucleon)Separation energy:S_N = 5.658(8) MeV (first neutron)
S_P = 14.47(60) MeV (first proton)Half-life:5.37(6) minDecay constant λ:0.0021512947875852 s^-1Specific activity α:3.084619105258 × 10⁺¹⁹ Bq g^-1
833680839.25905 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2(-)Magnetic dipole moment:μ(μ_N) = - 1.022(6)Quadrupole moment Q:0.142 barn (100 fm²)Nuclear g-factor:g_l = -0.4088Charge radius:3.4354(39) femtometer fmMirror nucleus:Manganese-43Year of discovery:1969

Radioactive Decay

Half-life T_½ = 5.37(6) min (minutes) respectively 3.222 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴³K	100 %	4.566(5) MeV

Parent Nuclides

Direct parent isotope is: ⁴³Cl.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 43) with Argon-43. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 25	Isobar A = 43
11	³⁶Na
12	³⁷Mg
13	³⁸Al	⁴³Al
14	³⁹Si	⁴³Si
15	⁴⁰P	⁴³P
16	⁴¹S	⁴³S
17	⁴²Cl	⁴³Cl
18	⁴³Ar	⁴³Ar
19	⁴⁴K	⁴³K
20	⁴⁵Ca	⁴³Ca
21	⁴⁶Sc	⁴³Sc
22	⁴⁷Ti	⁴³Ti
23	⁴⁸V	⁴³V
24	⁴⁹Cr	⁴³Cr
25	⁵⁰Mn	⁴³Mn
26	⁵¹Fe
27	⁵²Co
28	⁵³Ni
29	⁵⁴Cu
30	⁵⁵Zn