Iron-49

Properties and data of the isotope ⁴⁹Fe.

Contents

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

General data

Name of the isotope:Iron-49; Fe-49Symbol:⁴⁹Fe or 4926FeMass number A:49 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:23Isotopic mass:48.973429(26) u (atomic weight of Iron-49)Nuclide mass:48.9591663 u (calculated nuclear mass without electrons)Mass excess:-24.75073 MeVMass defect:0.4293149 u (per nucleus)Nuclear binding energy:399.90425346 MeV (per nucleus)
8.1613113 MeV (average binding energy per nucleon)Separation energy:S_N = 14.82(40) MeV (first neutron)
S_P = 2.743(25) MeV (first proton)Half-life:64.7(3) msDecay constant λ:10.713248540339 s^-1Specific activity α:1.344097745363 × 10⁺²³ Bq g^-1
3632696609089.7 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Isobaric spin: 3/2Mirror nucleus:Vanadium-49Year of discovery:1970

Radioactive Decay

Half-life T_½ = 64.7(3) ms respectively 6.47 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁴⁹Mn	43.3 %	12.870(24) MeV
β⁺, p	⁴⁸Cr	56.7 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 23) and isobaric (same nucleon number A = 49) with Iron-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 23	Isobar A = 49
10	³³Ne
11	³⁴Na
12	³⁵Mg
13	³⁶Al
14	³⁷Si
15	³⁸P
16	³⁹S	⁴⁹S
17	⁴⁰Cl	⁴⁹Cl
18	⁴¹Ar	⁴⁹Ar
19	⁴²K	⁴⁹K
20	⁴³Ca	⁴⁹Ca
21	⁴⁴Sc	⁴⁹Sc
22	⁴⁵Ti	⁴⁹Ti
23	⁴⁶V	⁴⁹V
24	⁴⁷Cr	⁴⁹Cr
25	⁴⁸Mn	⁴⁹Mn
26	⁴⁹Fe	⁴⁹Fe
27	⁵⁰Co	⁴⁹Co
28	⁵¹Ni	⁴⁹Ni