Iron-72

Properties and data of the isotope ⁷²Fe.

Contents

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

General data

Name of the isotope:Iron-72; Fe-72Symbol:⁷²Fe or 7226FeMass number A:72 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:46Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.7692307692308 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:71.96948(54) u (atomic weight of Iron-72)Nuclide mass:71.9552173 u (calculated nuclear mass without electrons)Mass excess:-28.4292 MeVMass defect:0.632556968 u (per nucleus)Nuclear binding energy:589.22302035 MeV (per nucleus)
8.18365306 MeV (average binding energy per nucleon)Separation energy:S_N = 5.07(64) MeV (first neutron)
S_P = 20.15(71) MeV (first proton)Half-life:150 nsDecay constant λ:4620981.203733 s^-1Specific activity α:3.919464749295 × 10⁺²⁸ Bq g^-1
1.05931479710 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1997

Radioactive Decay

Half-life T_½ = 150 ns respectively 1.5 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷²Co		11.77(64) MeV
β^-, n	⁷¹Co		7.87(68) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 72) with Iron-72. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 72
25	⁷¹Mn
26	⁷²Fe	⁷²Fe
27	⁷³Co	⁷²Co
28	⁷⁴Ni	⁷²Ni
29	⁷⁵Cu	⁷²Cu
30	⁷⁶Zn	⁷²Zn
31	⁷⁷Ga	⁷²Ga
32	⁷⁸Ge	⁷²Ge
33	⁷⁹As	⁷²As
34	⁸⁰Se	⁷²Se
35	⁸¹Br	⁷²Br
36	⁸²Kr	⁷²Kr
37	⁸³Rb	⁷²Rb
38	⁸⁴Sr
39	⁸⁵Y
40	⁸⁶Zr
41	⁸⁷Nb
42	⁸⁸Mo
43	⁸⁹Tc
44	⁹⁰Ru
45	⁹¹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd