Magnesium-39

Properties and data of the isotope ³⁹Mg.

Contents

Magnesium-39 is a hypothetic radioisotope of the chemical element magnesium, which has 27 neutrons in its atomic nucleus in addition to the element-specific 12 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 39.

The neutron-rich nuclide has not yet been detected or observed; the information provided here is based on theoretical calculations.

General data

Name of the isotope:Magnesium-39; Mg-39Symbol:³⁹Mg or 3912MgMass number A:39 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:27Isotopic mass:39.045920(550) u (atomic weight of Magnesium-39)Nuclide mass:39.0393371 u (calculated nuclear mass without electrons)Mass excess:42.7742 MeVMass defect:0.281933116 u (per nucleus)Nuclear binding energy:262.61900596 MeV (per nucleus)
6.73382067 MeV (average binding energy per nucleon)Separation energy:
S_P = 26.419(880) MeV (first proton)Half-life:< 180 nsDecay constant λ:3850817.6697775 s^-1Specific activity α:5.946196521367 × 10⁺²⁸ Bq g^-1
1.607080140910 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = < 180 ns respectively 1.80 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
n ?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 39) with Magnesium-39. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 27	Isobar A = 39
11	³⁸Na	³⁹Na
12	³⁹Mg	³⁹Mg
13	⁴⁰Al	³⁹Al
14	⁴¹Si	³⁹Si
15	⁴²P	³⁹P
16	⁴³S	³⁹S
17	⁴⁴Cl	³⁹Cl
18	⁴⁵Ar	³⁹Ar
19	⁴⁶K	³⁹K
20	⁴⁷Ca	³⁹Ca
21	⁴⁸Sc	³⁹Sc
22	⁴⁹Ti	³⁹Ti
23	⁵⁰V
24	⁵¹Cr
25	⁵²Mn
26	⁵³Fe
27	⁵⁴Co
28	⁵⁵Ni
29	⁵⁶Cu
30	⁵⁷Zn
31	⁵⁸Ga
32	⁵⁹Ge

External data and identifiers

Adopted Levels, Gammas:NuDat 39Mg

Literature and References

[1] - K. Fossez et al.:
Single-particle and collective motion in unbound deformed ³⁹Mg.
In: Physical Review C, 94, 054302, (2016), DOI 10.1103/PhysRevC.94.054302.