Potassium-47
Properties and data of the isotope 47K.
Potassium-47 is a radioisotope of the chemical element potassium, which has 28 neutrons in its atomic nucleus in addition to the element-specific 19 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 47.
The discovery of the radioactive isotope was reported in 1964 [1].
See also: List of individual Potassium isotopes (and general data sources).
General data
Name of the isotope:Potassium-47; K-47Symbol:47K or 4719KMass number A:47 (= number of nucleons)Atomic number Z:19 (= number of protons)Neutrons N:28Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4736842105263 (= neutron-proton ratio)Neutron excess (N-Z):9Isotopic mass:46.9616616(15) u (atomic weight of Potassium-47)Nuclide mass:46.9512388 u (calculated nuclear mass without electrons)Mass excess:-35.71199 MeVMass defect:0.429631656 u (per nucleus)Nuclear binding energy:400.19930977 MeV (per nucleus)
8.51487893 MeV (average binding energy per nucleon)Separation energy:SN = 8.3694(16) MeV (first neutron)
SP = 13.2297(27) MeV (first proton)Half-life:17.38(3) sDecay constant λ:0.039881886108167 s-1Specific activity α:5.221181215289 × 10+20 Bq g-1
14111300581.865 Ci g-1Spin and parity:
(nuclear angular momentum)1/2+Isobaric spin: 9/2Magnetic dipole moment:μ(μN) = +1.933(9)Nuclear g-factor:gl = 3.866Charge radius:3.4534(138) femtometer fmYear of discovery:1964
Radioactive Decay
Half-life T½ = 17.38(3) s respectively 1.738 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 47Ca | 100 % | 6.6327(26) MeV | |
Parent Nuclides
Direct parent isotope is: 47Ar.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 28) and isobaric (same nucleon number A = 47) with Potassium-47. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 28 | Isobar A = 47 |
|---|
| 11 | 39Na | |
| 12 | 40Mg | |
| 13 | 41Al | |
| 14 | 42Si | |
| 15 | 43P | 47P |
| 16 | 44S | 47S |
| 17 | 45Cl | 47Cl |
| 18 | 46Ar | 47Ar |
| 19 | 47K | 47K |
| 20 | 48Ca | 47Ca |
| 21 | 49Sc | 47Sc |
| 22 | 50Ti | 47Ti |
| 23 | 51V | 47V |
| 24 | 52Cr | 47Cr |
| 25 | 53Mn | 47Mn |
| 26 | 54Fe | 47Fe |
| 27 | 55Co | 47Co |
| 28 | 56Ni | |
| 29 | 57Cu | |
| 30 | 58Zn | |
| 31 | 59Ga | |
| 32 | 60Ge | |
External data and identifiers
Literature and References
[1] - T. Kuroyanagi, T. Tamura, K. Tanaka, H. Morinaga:
Potassium-47.
In: Nuclear Physics, 50, (1964), DOI 10.1016/0029-5582(64)90218-4.
Last update: 2026-01-08
Perma link: https://www.chemlin.org/isotope/potassium-47
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