Sodium-19

Properties and data of the isotope ¹⁹Na.

Contents

Sodium-19 is a radioisotope of the chemical element sodium, which, in addition to the element-specific 11 protons, has 8 neutrons in the atomic nucleus, resulting in the mass number 19. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of ¹⁹Na serves exclusively academic purposes.

The neutron-rich unstable isotope was first produced - according to a report from 1969 - by irradiating a Magnesium-24 target with 54.7 MeV protons [1]:

²⁴Mg(p,⁶He)¹⁹Na.

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

General data

Name of the isotope:Sodium-19; Na-19Symbol:¹⁹Na or 1911NaMass number A:19 (= number of nucleons)Atomic number Z:11 (= number of protons)Neutrons N:8Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):0.72727272727273 (= neutron-proton ratio)Neutron excess (N-Z):-3Isotopic mass:19.013880(11) u (atomic weight of Sodium-19)Nuclide mass:19.0078457 u (calculated nuclear mass without electrons)Mass excess:12.92914 MeVMass defect:0.14151468 u (per nucleus)Nuclear binding energy:131.82007533 MeV (per nucleus)
6.9378987 MeV (average binding energy per nucleon)Separation energy:S_N = 20.180(94) MeV (first neutron)Half-life:11.4 zsDecay constant λ:6.080238425964 × 10⁺¹⁹ s^-1Specific activity α:1.927160645429 × 10⁺⁴² Bq g^-1
5.208542284944 × 10⁺³¹ Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Mirror nucleus:Oxygen-19Year of discovery:1969

Radioactive Decay

Half-life T_½ = 11.4 zs respectively 1.14 × 10^-20 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	¹⁸Ne	?	0.832 MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 8) and isobaric (same nucleon number A = 19) with Sodium-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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

External data and identifiers

Adopted Levels, Gammas:NuDat 19Na

Literature and References

[1] - Joseph Cerny et al.:
New Nuclides ¹⁹Na and ²³Al Observed via the (p,⁶He) reaction.
In: Physical Review Letters, 22, 612, (1969), DOI 10.1103/PhysRevLett.22.612.

[2] - M. G. Pellegriti et al.:
Evidence for core excitation in single-particle states of ¹⁹Na.
In: Physics Letters B, 659, 5, 864-869, (2008), DOI 10.1016/j.physletb.2007.12.017.