Iron-54m

Properties and data of the isotope ^54mFe.

Contents

General data

Name of the isotope:Iron-54m; Fe-54mSymbol:^54mFe or 54m26FeMass 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-54m)
Excitation energy: 6527.1(11) keVNuclide 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)Half-life:364(7) nsDecay constant λ:1904250.4960438 s^-1Specific activity α:2.163710324486 × 10⁺²⁸ Bq g^-1
5.847865741856 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)10+Magnetic dipole moment:μ(μ_N) = +7.281(10)Quadrupole moment Q:0.285(25) barn (100 fm²)Nuclear g-factor:g_l = 0.7281

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
⁵⁴Fe		stable	0+

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-54m. 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