Vanadium-50

Properties and data of the isotope ⁵⁰V.

Contents

General Data

Radioactive Decay

NMR Data

Isotones und Isobares

Literature

Vanadium-50 is a weakly radioactive isotope of the chemical element vanadium, which has 27 neutrons in its atomic nucleus in addition to the element-specific 23 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 50.

The discovery of the radioisotope was reported simultaneously by two research groups and in the same issue of the journal Physical Review in 1949. Both articles describe the identification of vanadium-50 by mass spectrometric analysis of singly and doubly charged vanadium ions [1, 2].

See also: List of individual Vanadium isotopes (and general data sources).

General data

Name of the isotope:Vanadium-50; V-50Symbol:⁵⁰V or 5023VMass number A:50 (= number of nucleons)Atomic number Z:23 (= number of protons)Neutrons N:27Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1739130434783 (= neutron-proton ratio)Neutron excess (N-Z):4Isotopic mass:49.94715668(10) u (atomic weight of Vanadium-50)Nuclide mass:49.9345396 u (calculated nuclear mass without electrons)Mass excess:-49.22324 MeVMass defect:0.466771788 u (per nucleus)Nuclear binding energy:434.79511989 MeV (per nucleus)
8.6959024 MeV (average binding energy per nucleon)Separation energy:S_N = 9.3324(8) MeV (first neutron)
S_P = 7.94820(6) MeV (first proton)Half-life:2.65 × 10¹⁷ aDecay constant λ:8.288670892938 × 10^-26 s^-1Specific activity α:0.001018684564468 Bq g^-1
2.753201525589 × 10^-14 Ci g^-1Spin and parity:
(nuclear angular momentum)6+Magnetic dipole moment:μ(μ_N) = +3.3456889(14)Mirror nucleus:Cobalt-50Year of discovery:1949

Radioactive Decay

Half-life T_½ = 2.65 × 10¹⁷ a respectively 8.36258538326688 × 10²⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁵⁰Ti	99.3(7) %	2.20863(12) MeV
β^-	⁵⁰Cr	0.7(7) %	10.3812(6) MeV

Occurrence

Comparison of the natural Vanadium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Vanadium Isotopic mixture	50.9415 u	100 %
Isotope ⁵⁰V	49.94715668(10) u	0.0250(10) %	2.65 × 10¹⁷ a	6+
Isotope ⁵¹V	50.94395766(10) u	99.750(10) %	stable	7/2-

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ⁵⁰V

Isotope:⁵⁰V-NMRQuantity:0.0250(10) %Spin:6+Nuclearmagnetic moment
μ/μ_N:+3.3456889(14)Gyromagnetic ratio γ:2.670649 · 10⁷ rad T^-1 s^-1
4.25047 MHz T^-1Nuclear g-factor:g_l = 0.55761481666667Quadrupole moment Q:+0.21(4) barn (100 fm²)Line width parameter (factor):l = 16.7 fm⁴Resonance frequency:v₀ = 4.2505 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.05571 (H₀ = const.)
5.5905 (v₀ = const.)
0.000139 (at natural abundance)
relative receptivity as compared to ¹³C:
0.818 (at natural abundance)
327 (enriched)Reference compound:
(conditions)Pure Vanadium oxytrichloride VOCl₃ with 10% Benzene-d6 C₆D₆Frequency ratio:Ξ(⁵⁰V) = 9.970309 % [based on the reference substance]Chemical shift range:ca. 1900 ppm [-1900 to 0]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 50) with Vanadium-50. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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

External data and identifiers

Adopted Levels, Gammas:NuDat 50V

Literature and References

[1] - David C. Hess, JR., Mark G. Inghram:
On the Occurrence of Vanadium 50 in Nature.
In: Physical Review, 76, 1717, (1949), DOI 10.1103/PhysRev.76.1717.

[2] - Wallace T. Leland:
A Naturally Occurring Odd-Odd Isotope of Vanadium.
In: Physical Review, 76, 1722, (1949), DOI 10.1103/PhysRev.76.1722.

[3] - F. A. Danevich et al.:
Decay scheme of 50V.
In: arXiv: 2008.02751, (2020), DOI 10.48550/arXiv.2008.02751.