Manganese-51
Properties and data of the isotope 51Mn.
Manganese-51 is a radioisotope of the chemical element manganese, which has 26 neutrons in its atomic nucleus in addition to the element-specific 25 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 51.
See also: List of individual Manganese isotopes (and general data sources).
General data
Name of the isotope:Manganese-51; Mn-51Symbol:51Mn or 5125MnMass number A:51 (= number of nucleons)Atomic number Z:25 (= number of protons)Neutrons N:26Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.04 (= neutron-proton ratio)Neutron excess (N-Z):1Isotopic mass:50.9482088(3) u (atomic weight of Manganese-51)Nuclide mass:50.9344946 u (calculated nuclear mass without electrons)Mass excess:-48.24319 MeVMass defect:0.472704816 u (per nucleus)Nuclear binding energy:440.32169988 MeV (per nucleus)
8.63375882 MeV (average binding energy per nucleon)Separation energy:SN = 13.6877(3) MeV (first neutron)
SP = 5.27083(29) MeV (first proton)Half-life:45.81(21) minDecay constant λ:0.00025218190371824 s-1Specific activity α:3.037349893036 × 10+18 Bq g-1
82090537.649635 Ci g-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μN) = +3.575(4)Quadrupole moment Q:0.41(8) barn (100 fm2)Nuclear g-factor:gl = 1.43Charge radius:3.7026(212) femtometer fmMirror nucleus:Iron-51Year of discovery:1938
Radioactive Decay
Half-life T½ = 45.81(21) min (minutes) respectively 2.7486 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC β+ | 51Cr | 100 % | 3.2075(2) MeV | |
Parent Nuclides
Direct parent isotope is: 51Fe.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 51) with Manganese-51. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 26 | Isobar A = 51 |
|---|
| 11 | 37Na | |
| 12 | 38Mg | |
| 13 | 39Al | |
| 14 | 40Si | |
| 15 | 41P | |
| 16 | 42S | |
| 17 | 43Cl | 51Cl |
| 18 | 44Ar | 51Ar |
| 19 | 45K | 51K |
| 20 | 46Ca | 51Ca |
| 21 | 47Sc | 51Sc |
| 22 | 48Ti | 51Ti |
| 23 | 49V | 51V |
| 24 | 50Cr | 51Cr |
| 25 | 51Mn | 51Mn |
| 26 | 52Fe | 51Fe |
| 27 | 53Co | 51Co |
| 28 | 54Ni | 51Ni |
| 29 | 55Cu | |
| 30 | 56Zn | |
External data and identifiers
Literature and References
[1] - J. J. Livingood, G. T. Seaborg:
Radioactive Manganese Isotopes.
In: Physical Review, 54, 391, (1938), DOI 10.1103/PhysRev.54.391.
Last update: 2026-01-13
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