Iron-71

Properties and data of the isotope ⁷¹Fe.

Contents

General data

Name of the isotope:Iron-71; Fe-71Symbol:⁷¹Fe or 7126FeMass number A:71 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:45Isotopic mass:70.96626(43) u (atomic weight of Iron-71)Nuclide mass:70.9519973 u (calculated nuclear mass without electrons)Mass excess:-31.42861 MeVMass defect:0.627112052 u (per nucleus)Nuclear binding energy:584.15111377 MeV (per nucleus)
8.22748048 MeV (average binding energy per nucleon)Separation energy:S_N = 2.99(56) MeV (first neutron)
S_P = 19.22(64) MeV (first proton)Half-life:28(5) msDecay constant λ:24.755256448569 s^-1Specific activity α:2.129709162244 × 10⁺²³ Bq g^-1
5755970708770 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2+~Year of discovery:1997

Radioactive Decay

Half-life T_½ = 28(5) ms respectively 2.8 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷¹Co	100 %	12.94(61) MeV
β^-, n	⁷⁰Co		7.13(50) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 45) and isobaric (same nucleon number A = 71) with Iron-71. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 45	Isobar A = 71
25	⁷⁰Mn	⁷¹Mn
26	⁷¹Fe	⁷¹Fe
27	⁷²Co	⁷¹Co
28	⁷³Ni	⁷¹Ni
29	⁷⁴Cu	⁷¹Cu
30	⁷⁵Zn	⁷¹Zn
31	⁷⁶Ga	⁷¹Ga
32	⁷⁷Ge	⁷¹Ge
33	⁷⁸As	⁷¹As
34	⁷⁹Se	⁷¹Se
35	⁸⁰Br	⁷¹Br
36	⁸¹Kr	⁷¹Kr
37	⁸²Rb	⁷¹Rb
38	⁸³Sr
39	⁸⁴Y
40	⁸⁵Zr
41	⁸⁶Nb
42	⁸⁷Mo
43	⁸⁸Tc
44	⁸⁹Ru
45	⁹⁰Rh
46	⁹¹Pd
47	⁹²Ag