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Magnesium-31

Properties and data of the isotope 31Mg.


Content

See also: list of Magnesium isotopes.

 

General data

Name of the isotope:Magnesium-31; Mg-31Symbol:31Mg or 3112MgMass number A:31 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:19Isotopic mass:30.996648(3) u (atomic weight of Magnesium-31)Nuclide mass:30.9900651 u (calculated nuclear mass without electrons)Mass excess:-3.12237 MeVMass defect:0.261885788 u (per nucleus)Nuclear binding energy:243.94504021 MeV (per nucleus)
7.86919485 MeV (average binding energy per nucleon)
Separation energy:SN = 2.310(5) MeV (first neutron)
SP = 18.886(6) MeV (first proton)
Half-life:236(20) msDecay constant λ:2.9370643244065 s-1Specific activity α:5.895805025423 × 10+22 Bq g-1
1593460817682.1 Ci g-1
Spin and parity:
(nuclear angular momentum)
1/2(+)Magnetic dipole moment:μ(μN) = - 0.88340(15)Nuclear g-factor:gl = -1.7668Year of discovery:1977

 

Radioactive Decay

Half-life T½ = 236(20) ms respectively 2.36 × 10-1 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-31Al93.8 %11.7646 MeV
β-, n30Al6.2(19) %4.61077 MeV

 

Parent Nuclides

Direct parent isotopes are: 31Na, 32Na, 33Na.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 31) with Magnesium-31. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 19Isobar A = 31
827O
928F31F
1029Ne31Ne
1130Na31Na
1231Mg31Mg
1332Al31Al
1433Si31Si
1534P31P
1635S31S
1736Cl31Cl
1837Ar31Ar
1938K
2039Ca
2140Sc
2241Ti
2342V
2443Cr
2544Mn
2645Fe
2746Co

 

External data and identifiers

Adopted Levels, Gammas:NuDat 31Mg

 


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Last update: 2020-10-12


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