Iron-54

Properties and data of the isotope ⁵⁴Fe.

Contents

General data

Name of the isotope:Iron-54; Fe-54Symbol:⁵⁴Fe or 5426FeMass number A:54 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:28Isotopic mass:53.939609(3) u (atomic weight of Iron-54)Nuclide mass:53.9253463 u (calculated nuclear mass without electrons)Mass excess:-56.25385 MeVMass defect:0.50645948 u (per nucleus)Nuclear binding energy:471.76396686 MeV (per nucleus)
8.73636976 MeV (average binding energy per nucleon)Separation energy:S_N = 13.3783(16) MeV (first neutron)
S_P = 8.8534(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.6933(19) femtometer fmMirror nucleus:Nickel-54Year of discovery:1923

Parent Nuclides

Direct parent isotopes are: ⁵⁴Co, ⁵⁴Mn.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Iron Isotopic mixture	55.845 u	100 %
Isotope ⁵⁴Fe	53.939609(3) u	5.845(105) %	stable	0+
Isotope ⁵⁶Fe	55.934936(3) u	91.754(106) %	stable	0+
Isotope ⁵⁷Fe	56.935393(3) u	2.119(29) %	stable	1/2-
Isotope ⁵⁸Fe	57.933274(3) u	0.282(12) %	stable	0+

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
^54mFe	6527.1(11) keV	364(7) ns	10+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 28) and isobaric (same nucleon number A = 54) with Iron-54. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 28	Isobar A = 54
11	³⁹Na
12	⁴⁰Mg
13	⁴¹Al
14	⁴²Si
15	⁴³P
16	⁴⁴S
17	⁴⁵Cl
18	⁴⁶Ar
19	⁴⁷K	⁵⁴K
20	⁴⁸Ca	⁵⁴Ca
21	⁴⁹Sc	⁵⁴Sc
22	⁵⁰Ti	⁵⁴Ti
23	⁵¹V	⁵⁴V
24	⁵²Cr	⁵⁴Cr
25	⁵³Mn	⁵⁴Mn
26	⁵⁴Fe	⁵⁴Fe
27	⁵⁵Co	⁵⁴Co
28	⁵⁶Ni	⁵⁴Ni
29	⁵⁷Cu	⁵⁴Cu
30	⁵⁸Zn	⁵⁴Zn
31	⁵⁹Ga
32	⁶⁰Ge