Potassium-38m2

Properties and data of the isotope ³⁸K.

Content

General data

Name of the isotope:Potassium-38m2; K-38m2Symbol:³⁸K or 3819KMass number A:38 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:19Isotopic mass:37.96908112(21) u (atomic weight of Potassium-38m2)
Excitation energy: 3458.10(17) keVNuclide mass:37.9586583 u (calculated nuclear mass without electrons)Mass excess:-28.80075 MeVMass defect:0.344227892 u (per nucleus)Nuclear binding energy:320.64621603 MeV (per nucleus)
8.43805832 MeV (average binding energy per nucleon)Half-life:21.95(11) μsDecay constant λ:31578.459251023 s^-1Specific activity α:5.139727831065 × 10⁺²⁶ Bq g^-1
1.389115630017 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(7)+Magnetic dipole moment:μ(μ_N) = + 3.836(14)Nuclear g-factor:g_l = 0.548

Radioactive Decay

Half-life T_½ = 21.95(11) μs respectively 2.195 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	³⁸K	100 %	3.458 MeV

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
³⁸K		7.651(19) min	3+
^38m1K	130.22(16) keV	924.4(5) ms	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 38) with Potassium-38m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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