Manganese-58m

Properties and data of the isotope ⁵⁸Mn.

Content

General data

Name of the isotope:Manganese-58m; Mn-58mSymbol:⁵⁸Mn or 5825MnMass number A:58 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:33Isotopic mass:57.9400666(29) u (atomic weight of Manganese-58m)
Excitation energy: 71.77(5) keVNuclide mass:57.9263524 u (calculated nuclear mass without electrons)Mass excess:-55.8276 MeVMass defect:0.541501428 u (per nucleus)Nuclear binding energy:504.40533117 MeV (per nucleus)
8.69664364 MeV (average binding energy per nucleon)Half-life:65.4(5) sDecay constant λ:0.010598580742507 s^-1Specific activity α:1.119756949943 × 10⁺²⁰ Bq g^-1
3026370134.983 Ci g^-1Spin and parity:
(nuclear angular momentum)4+Magnetic dipole moment:μ(μ_N) = +3.062(2)Nuclear g-factor:g_l = 0.7655

Radioactive Decay

Half-life T_½ = 65.4(5) s respectively 6.54 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁸Fe	90 %
Iso	⁵⁸Mn	10 %

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
⁵⁸Mn		3.0(1) s	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 58) with Manganese-58m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 33	Isobar A = 58
16	⁴⁹S
17	⁵⁰Cl
18	⁵¹Ar
19	⁵²K
20	⁵³Ca	⁵⁸Ca
21	⁵⁴Sc	⁵⁸Sc
22	⁵⁵Ti	⁵⁸Ti
23	⁵⁶V	⁵⁸V
24	⁵⁷Cr	⁵⁸Cr
25	⁵⁸Mn	⁵⁸Mn
26	⁵⁹Fe	⁵⁸Fe
27	⁶⁰Co	⁵⁸Co
28	⁶¹Ni	⁵⁸Ni
29	⁶²Cu	⁵⁸Cu
30	⁶³Zn	⁵⁸Zn
31	⁶⁴Ga	⁵⁸Ga
32	⁶⁵Ge
33	⁶⁶As
34	⁶⁷Se
35	⁶⁸Br
36	⁶⁹Kr