Potassium-47

Properties and data of the isotope ⁴⁷K.

Content

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:28Isotopic 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:S_N = 8.3694(16) MeV (first neutron)
S_P = 13.2280(18) MeV (first proton)Half-life:17.50(24) sDecay constant λ:0.039608410317711 s^-1Specific activity α:5.185378829813 × 10⁺²⁰ Bq g^-1
14014537377.875 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Isobaric spin: 9/2Magnetic dipole moment:μ(μ_N) = + 1.933(9)Nuclear g-factor:g_l = 3.866Charge radius:3.4534(138) femtometer fmYear of discovery:1964

Radioactive Decay

Half-life T_½ = 17.50(24) s respectively 1.750 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁷Ca	100 %	6.6324(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.

OZ	Isotone N = 28	Isobar A = 47
11	³⁹Na
12	⁴⁰Mg
13	⁴¹Al
14	⁴²Si
15	⁴³P
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