Iron-61m

Properties and data of the isotope ⁶¹Fe.

Content

General data

Name of the isotope:Iron-61m; Fe-61mSymbol:⁶¹Fe or 6126FeMass number A:61 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:35Isotopic mass:60.9367462(28) u (atomic weight of Iron-61m)
Excitation energy: 861.67(11) keVNuclide mass:60.9224835 u (calculated nuclear mass without electrons)Mass excess:-58.92054 MeVMass defect:0.569976692 u (per nucleus)Nuclear binding energy:530.92986874 MeV (per nucleus)
8.70376834 MeV (average binding energy per nucleon)Half-life:0.238(5) μsDecay constant λ:2912383.1115964 s^-1Specific activity α:2.923130222689 × 10⁺²⁸ Bq g^-1
7.900351953213 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Magnetic dipole moment:μ(μ_N) = -1.031(9)Quadrupole moment Q:0.44(6) barn (100 fm²)Nuclear g-factor:g_l = -0.22911111111111

Radioactive Decay

Half-life T_½ = 0.238(5) μs respectively 2.38 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁶¹Fe	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
⁶¹Fe		5.98(6) min	(3/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 61) with Iron-61m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 35	Isobar A = 61
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc	⁶¹Sc
22	⁵⁷Ti	⁶¹Ti
23	⁵⁸V	⁶¹V
24	⁵⁹Cr	⁶¹Cr
25	⁶⁰Mn	⁶¹Mn
26	⁶¹Fe	⁶¹Fe
27	⁶²Co	⁶¹Co
28	⁶³Ni	⁶¹Ni
29	⁶⁴Cu	⁶¹Cu
30	⁶⁵Zn	⁶¹Zn
31	⁶⁶Ga	⁶¹Ga
32	⁶⁷Ge	⁶¹Ge
33	⁶⁸As
34	⁶⁹Se
35	⁷⁰Br
36	⁷¹Kr
37	⁷²Rb
38	⁷³Sr