Iron-52m

Properties and data of the isotope ^52mFe.

Contents

See also: List of individual Iron isotopes (and general data sources).

General data

Name of the isotope:Iron-52m; Fe-52mSymbol:^52mFe or 52m26FeMass number A:52 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:26Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1 (= neutron-proton ratio)Neutron excess (N-Z):0Excitation energy:6958.0(4) keVIsotopic mass:51.948115(5) u (atomic weight of Iron-52m)Nuclide mass:51.9338523 u (calculated nuclear mass without electrons)Mass excess:-48.33057 MeVMass defect:0.480623648 u (per nucleus)Nuclear binding energy:447.69804437 MeV (per nucleus)
8.60957778 MeV (average binding energy per nucleon)Half-life:45.9(6) sDecay constant λ:0.015101245763833 s^-1Specific activity α:1.783173120594 × 10⁺²⁰ Bq g^-1
4819386812.4178 Ci g^-1Spin and parity:
(nuclear angular momentum)12+

Radioactive Decay

Half-life T_½ = 45.9(6) s respectively 4.59 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁵³Mn
Iso	⁵²Fe

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
⁵²Fe		8.275(8) h	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 52) with Iron-52m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 26	Isobar A = 52
11	³⁷Na
12	³⁸Mg
13	³⁹Al
14	⁴⁰Si
15	⁴¹P
16	⁴²S
17	⁴³Cl	⁵²Cl
18	⁴⁴Ar	⁵²Ar
19	⁴⁵K	⁵²K
20	⁴⁶Ca	⁵²Ca
21	⁴⁷Sc	⁵²Sc
22	⁴⁸Ti	⁵²Ti
23	⁴⁹V	⁵²V
24	⁵⁰Cr	⁵²Cr
25	⁵¹Mn	⁵²Mn
26	⁵²Fe	⁵²Fe
27	⁵³Co	⁵²Co
28	⁵⁴Ni	⁵²Ni
29	⁵⁵Cu
30	⁵⁶Zn