Manganese-60m

Properties and data of the isotope ⁶⁰Mn.

Content

General data

Name of the isotope:Manganese-60m; Mn-60mSymbol:⁶⁰Mn or 6025MnMass number A:60 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:35Isotopic mass:59.9431366(25) u (atomic weight of Manganese-60m)
Excitation energy: 271.8(1) keVNuclide mass:59.9294224 u (calculated nuclear mass without electrons)Mass excess:-52.96792 MeVMass defect:0.55576126 u (per nucleus)Nuclear binding energy:517.68827912 MeV (per nucleus)
8.62813799 MeV (average binding energy per nucleon)Half-life:1.77(2) sDecay constant λ:0.39160857658754 s^-1Specific activity α:3.997155949439 × 10⁺²¹ Bq g^-1
108031241876.75 Ci g^-1Spin and parity:
(nuclear angular momentum)4+Magnetic dipole moment:μ(μ_N) = +3.400(2)Nuclear g-factor:g_l = 0.85

Radioactive Decay

Half-life T_½ = 1.77(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶⁰Fe	88.5 %
Iso	⁶⁰Mn	11.5 %

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
⁶⁰Mn		0.28(2) s	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 60) with Manganese-60m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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