Fluorine-28

Properties and data of the isotope ²⁸F.

Contents

Fluorine-28 is a radioisotope of the chemical element fluorine, which has 19 neutrons in its atomic nucleus in addition to the element-specific 9 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 28. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ²⁸F is exclusively for academic purposes.

The first observation of the neutron rich instable isotope was first reported in 2012 in an experiment in which neon-29 ions accelerated to 62 MeV/u were fragmented on a Be target [1].

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

General data

Name of the isotope:Fluorine-28; F-28Symbol:²⁸F or 289FMass number A:28 (= number of nucleons)Atomic number Z:9 (= number of protons)Neutrons N:19Isotopic mass:28.035860(130) u (atomic weight of Fluorine-28)Nuclide mass:28.0309228 u (calculated nuclear mass without electrons)Mass excess:33.40337 MeVMass defect:0.199198692 u (per nucleus)Nuclear binding energy:185.55238641 MeV (per nucleus)
6.62687094 MeV (average binding energy per nucleon)Separation energy:
S_P = 18.555(514) MeV (first proton)Half-life:46 zsDecay constant λ:1.506841696869 × 10⁺¹⁹ s^-1Specific activity α:3.240861768633 × 10⁺⁴¹ Bq g^-1
8.759085861171 × 10⁺³⁰ Ci g^-1Spin and parity:
(nuclear angular momentum)4-Year of discovery:2012

Radioactive Decay

Half-life T_½ = 46 zs respectively 4.6 × 10^-20 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
n	²⁷F	100 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 28) with Fluorine-28. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 19	Isobar A = 28
8	²⁷O	²⁸O
9	²⁸F	²⁸F
10	²⁹Ne	²⁸Ne
11	³⁰Na	²⁸Na
12	³¹Mg	²⁸Mg
13	³²Al	²⁸Al
14	³³Si	²⁸Si
15	³⁴P	²⁸P
16	³⁵S	²⁸S
17	³⁶Cl	²⁸Cl
18	³⁷Ar
19	³⁸K
20	³⁹Ca
21	⁴⁰Sc
22	⁴¹Ti
23	⁴²V
24	⁴³Cr
25	⁴⁴Mn
26	⁴⁵Fe
27	⁴⁶Co

External data and identifiers

Adopted Levels, Gammas:NuDat 28F

Literature and References

[1] - G. Christian et al.:
Exploring the Low-Z Shore of the Island of Inversion at N=19.
In: Physical Review Letters, 108, 032501, (2012), DOI 10.1103/PhysRevLett.108.032501.