Iron-50

Properties and data of the isotope ⁵⁰Fe.

Contents

General data

Name of the isotope:Iron-50; Fe-50Symbol:⁵⁰Fe or 5026FeMass number A:50 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:24Isotopic mass:49.962988(9) u (atomic weight of Iron-50)Nuclide mass:49.9487253 u (calculated nuclear mass without electrons)Mass excess:-34.47646 MeVMass defect:0.448420816 u (per nucleus)Nuclear binding energy:417.70129958 MeV (per nucleus)
8.35402599 MeV (average binding energy per nucleon)Separation energy:S_N = 17.797(26) MeV (first neutron)
S_P = 4.145(9) MeV (first proton)Half-life:152.0(6) msDecay constant λ:4.5601788194733 s^-1Specific activity α:5.604497795381 × 10⁺²² Bq g^-1
1514729133886.8 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Chromium-50Year of discovery:1977

Radioactive Decay

Half-life T_½ = 152.0(6) ms respectively 1.520 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁵⁰Mn	> 99.9 %	8.151(8) MeV
β⁺, p	⁴⁹Cr	< 0.01 %

Parent Nuclides

Direct parent isotope is: ⁵⁰Co.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 24) and isobaric (same nucleon number A = 50) with Iron-50. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 24	Isobar A = 50
10	³⁴Ne
11	³⁵Na
12	³⁶Mg
13	³⁷Al
14	³⁸Si
15	³⁹P
16	⁴⁰S
17	⁴¹Cl	⁵⁰Cl
18	⁴²Ar	⁵⁰Ar
19	⁴³K	⁵⁰K
20	⁴⁴Ca	⁵⁰Ca
21	⁴⁵Sc	⁵⁰Sc
22	⁴⁶Ti	⁵⁰Ti
23	⁴⁷V	⁵⁰V
24	⁴⁸Cr	⁵⁰Cr
25	⁴⁹Mn	⁵⁰Mn
26	⁵⁰Fe	⁵⁰Fe
27	⁵¹Co	⁵⁰Co
28	⁵²Ni	⁵⁰Ni
29	⁵³Cu
30	⁵⁴Zn