Neon-19

Properties and data of the isotope ¹⁹Ne.

Contents

Neon-19 is a radioisotope of the chemical element neon, which has 9 neutrons in its atomic nucleus in addition to the element-specific 10 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 19. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ¹⁹Ne is exclusively for academic purposes and experimental research.

The unstable isotope was first described in 1939; neon-19 was produced by irradiating fluorine-containing materials with protons through a charge exchange reaction:

¹⁹F(p,n)¹⁹Ne.

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

General data

Name of the isotope:Neon-19; Ne-19Symbol:¹⁹Ne or 1910NeMass number A:19 (= number of nucleons)Atomic number Z:10 (= number of protons)Neutrons N:9Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.9 (= neutron-proton ratio)Neutron excess (N-Z):-1Isotopic mass:19.00188091(17) u (atomic weight of Neon-19)Nuclide mass:18.9963951 u (calculated nuclear mass without electrons)Mass excess:1.75206 MeVMass defect:0.154353654 u (per nucleus)Nuclear binding energy:143.77950258 MeV (per nucleus)
7.56734224 MeV (average binding energy per nucleon)Separation energy:S_N = 11.639(4) MeV (first neutron)
S_P = 6.4100(5) MeV (first proton)Half-life:17.2569(19) sDecay constant λ:0.040166378698373 s^-1Specific activity α:1.273092580816 × 10⁺²¹ Bq g^-1
34407907589.638 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Isobaric spin: 1/2Magnetic dipole moment:μ(μ_N) = -1.88515(7)Nuclear g-factor:g_l = -3.7703Charge radius:3.0082(40) femtometer fmMirror nucleus:Fluorine-19Year of discovery:1939

Radioactive Decay

Half-life T_½ = 17.2569(19) s respectively 1.72569 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC β⁺	¹⁹F	100 %	3.23950(16) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 9) and isobaric (same nucleon number A = 19) with Neon-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 9	Isobar A = 19
3	¹²Li
4	¹³Be
5	¹⁴B	¹⁹B
6	¹⁵C	¹⁹C
7	¹⁶N	¹⁹N
8	¹⁷O	¹⁹O
9	¹⁸F	¹⁹F
10	¹⁹Ne	¹⁹Ne
11	²⁰Na	¹⁹Na
12	²¹Mg	¹⁹Mg
13	²²Al
14	²³Si
15	²⁴P

External data and identifiers

Adopted Levels, Gammas:NuDat 19Ne

Literature and References

[1] - J. G. Fox, E. C. Creutz, M. G. White, L. A. Delsasso:
The Difference in Coulomb Energy of Light, Isobaric Nuclei.
In: Physical Review, 55, 1106, (1939), DOI 10.1103/PhysRev.55.1106.