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Iron-57

Properties and data of the isotope 57Fe.


Contents

See also: list of Iron isotopes.

 

General data

Name of the isotope:Iron-57; Fe-57Symbol:57Fe or 5726FeMass number A:57 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:31Isotopic mass:56.935393(3) u (atomic weight of Iron-57)Nuclide mass:56.9211303 u (calculated nuclear mass without electrons)Mass excess:-60.18103 MeVMass defect:0.536670228 u (per nucleus)Nuclear binding energy:499.90509736 MeV (per nucleus)
8.77026487 MeV (average binding energy per nucleon)
Separation energy:SN = 7.64607(4) MeV (first neutron)
SP = 10.55927(21) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
1/2-Isobaric spin: 5/2Magnetic dipole moment:μ(μN) = +0.09064(7)Charge radius:3.7532(17) femtometer fmYear of discovery:1935

 

Parent Nuclides

Direct parent isotopes are: 57Co, 57Mn.

 

Occurrence

Comparison of the natural Iron isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Iron
Isotopic mixture
55.845 u100 %
Isotope 54Fe53.939609(3) u5.845(105) %stable0+
Isotope 56Fe55.934936(3) u91.754(106) %stable0+
Isotope 57Fe56.935393(3) u2.119(29) %stable1/2-
Isotope 58Fe57.933274(3) u0.282(12) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 57Fe

Isotope:57Fe-NMRQuantity:2.119(29) %Spin:1/2-Nuclearmagnetic moment
μ/μN:
+0.09064(7)Gyromagnetic ratio γ:0.8661 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.18128Quadrupole moment Q:+ 0.160 barn (100 fm2)Resonance frequency:v0 = 1.3816 at 1 TRelative Sensitivity:0.00003 (H0 = const.)
0.0324 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 31) and isobaric (same nucleon number A = 57) with Iron-57. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 31Isobar A = 57
1546P
1647S
1748Cl
1849Ar
1950K
2051Ca57Ca
2152Sc57Sc
2253Ti57Ti
2354V57V
2455Cr57Cr
2556Mn57Mn
2657Fe57Fe
2758Co57Co
2859Ni57Ni
2960Cu57Cu
3061Zn57Zn
3162Ga
3263Ge
3364As
3465Se
3566Br
3667Kr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 57Fe

 


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Last update: 2020-10-13


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