Argon-48

Properties and data of the isotope ⁴⁸Ar.

Content

General data

Name of the isotope:Argon-48; Ar-48Symbol:⁴⁸Ar or 4818ArMass number A:48 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:30Isotopic mass:47.97608(33) u (atomic weight of Argon-48)Nuclide mass:47.9662057 u (calculated nuclear mass without electrons)Mass excess:-22.28134 MeVMass defect:0.424718056 u (per nucleus)Nuclear binding energy:395.62232086 MeV (per nucleus)
8.24213168 MeV (average binding energy per nucleon)Separation energy:S_N = 4.99(31) MeV (first neutron)
S_P = 19.79(50) MeV (first proton)Half-life:475(40) msDecay constant λ:1.4592572222315 s^-1Specific activity α:1.869755860246 × 10⁺²² Bq g^-1
505339421688.22 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2004

Radioactive Decay

Half-life T_½ = 475(40) ms respectively 4.75 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁸K	100 %	10.00(31) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 48) with Argon-48. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 30	Isobar A = 48
13	⁴³Al
14	⁴⁴Si
15	⁴⁵P
16	⁴⁶S	⁴⁸S
17	⁴⁷Cl	⁴⁸Cl
18	⁴⁸Ar	⁴⁸Ar
19	⁴⁹K	⁴⁸K
20	⁵⁰Ca	⁴⁸Ca
21	⁵¹Sc	⁴⁸Sc
22	⁵²Ti	⁴⁸Ti
23	⁵³V	⁴⁸V
24	⁵⁴Cr	⁴⁸Cr
25	⁵⁵Mn	⁴⁸Mn
26	⁵⁶Fe	⁴⁸Fe
27	⁵⁷Co	⁴⁸Co
28	⁵⁸Ni	⁴⁸Ni
29	⁵⁹Cu
30	⁶⁰Zn
31	⁶¹Ga
32	⁶²Ge
33	⁶³As
34	⁶⁴Se