Argon-37

Properties and data of the isotope ³⁷Ar.

Contents

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

General data

Name of the isotope:Argon-37; Ar-37Symbol:³⁷Ar or 3718ArMass number A:37 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:19Isotopic mass:36.96677631(22) u (atomic weight of Argon-37)Nuclide mass:36.956902 u (calculated nuclear mass without electrons)Mass excess:-30.94767 MeVMass defect:0.33870767 u (per nucleus)Nuclear binding energy:315.50416236 MeV (per nucleus)
8.52713952 MeV (average binding energy per nucleon)Separation energy:S_N = 8.78744(21) MeV (first neutron)
S_P = 8.71463(21) MeV (first proton)Half-life:35.011(19) dDecay constant λ:2.291433210144 × 10^-7 s^-1Specific activity α:3.833148211840 × 10⁺¹⁵ Bq g^-1
103598.60032002 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = + 1.146(5)Charge radius:3.3908(22) femtometer fmMirror nucleus:Potassium-37Year of discovery:1941

Radioactive Decay

Half-life T_½ = 35.011(19) d respectively 3.0249504 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	³⁷Cl	100 %	0.813873(213) MeV

Parent Nuclides

Direct parent isotope is: ³⁷K.

NMR data

Nuclear magnetic properties of the NMR active Nuclide ³⁷Ar

Isotope:³⁷Ar-NMRQuantity:-Spin:3/2+Nuclearmagnetic moment
μ/μ_N:+ 1.146(5)Nuclear g-factor:g_l = 0.764Quadrupole moment Q:+ 0.076(9) barn (100 fm²)Resonance frequency:v₀ = 5.819 at 1 TRelative Sensitivity:0.01276 (H₀ = const.)
0.6833 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 37) with Argon-37. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 19	Isobar A = 37
8	²⁷O
9	²⁸F
10	²⁹Ne
11	³⁰Na	³⁷Na
12	³¹Mg	³⁷Mg
13	³²Al	³⁷Al
14	³³Si	³⁷Si
15	³⁴P	³⁷P
16	³⁵S	³⁷S
17	³⁶Cl	³⁷Cl
18	³⁷Ar	³⁷Ar
19	³⁸K	³⁷K
20	³⁹Ca	³⁷Ca
21	⁴⁰Sc	³⁷Sc
22	⁴¹Ti
23	⁴²V
24	⁴³Cr
25	⁴⁴Mn
26	⁴⁵Fe
27	⁴⁶Co