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Potassium-39

Properties and data of the isotope 39K.


Content

See also: list of Potassium isotopes.

 

General data

Name of the isotope:Potassium-39; K-39Symbol:39K or 3919KMass number A:39 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:20Isotopic mass:38.96370649(3) u (atomic weight of Potassium-39)Nuclide mass:38.9532836 u (calculated nuclear mass without electrons)Mass excess:-33.80719 MeVMass defect:0.358267438 u (per nucleus)Nuclear binding energy:333.72396889 MeV (per nucleus)
8.55702484 MeV (average binding energy per nucleon)
Separation energy:SN = 13.07775(20) MeV (first neutron)
SP = 6.38134(19) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
3/2+Magnetic dipole moment:μ(μN) = +0.391470(8)Charge radius:3.4349(19) femtometer fmMirror nucleus:Calcium-39Year of discovery:1921

 

Parent Nuclides

Direct parent isotopes are: 39Ca, 39Ar, 40Sc.

 

Occurrence

Comparison of the natural Potassium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Potassium
Isotopic mixture
39.0983 u100 %
Isotope 39K38.96370649(3) u93.2581(44) %stable3/2+
Isotope 41K40.96182526(3) u6.7302(44) %stable3/2+
Isotope 40K39.9639982(4) u0.0117(1) %1.248(3) × 109 a4-

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 39K

Isotope:39K-NMRQuantity:93.2581(44) %Spin:3/2+Nuclearmagnetic moment
μ/μN:
+0.391470(8)Gyromagnetic ratio γ:1.2498 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.26098Quadrupole moment Q:+ 0.0603(6) barn (100 fm2)Resonance frequency:v0 = 1.9893 at 1 TRelative Sensitivity:0.00051 (H0 = const.)
0.2336 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 20) and isobaric (same nucleon number A = 39) with Potassium-39. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 20Isobar A = 39
828O
929F
1030Ne
1131Na39Na
1232Mg39Mg
1333Al39Al
1434Si39Si
1535P39P
1636S39S
1737Cl39Cl
1838Ar39Ar
1939K39K
2040Ca39Ca
2141Sc39Sc
2242Ti39Ti
2343V
2444Cr
2545Mn
2646Fe
2747Co
2848Ni

 

External data and identifiers

Adopted Levels, Gammas:NuDat 39K

 


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Last update: 2023-10-04


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