Argon-37
Properties and data of the isotope 37Ar.
See also: list of Argon isotopes.
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:SN = 8.78744(21) MeV (first neutron)
SP = 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(μN) = + 1.146(5)Charge radius:3.3908(22) femtometer fmMirror nucleus:Potassium-37Year of discovery:1941
Radioactive Decay
Half-life T½ = 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/μN:+ 1.146(5)Nuclear g-factor:gl = 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 | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/argon-37
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