Neon-29

Properties and data of the isotope ²⁹Ne.

Contents

Neon-29 is a radioisotope of the chemical element neon, which has 19 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 29. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ²⁹Ne is exclusively for academic purposes and experimental research.

According to a report from 1985, the first observation of the neutron-rich isotope was made by irradiating a tantalum target with argon-40 ions accelerated to 44 MeV/u [1].

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

General data

Name of the isotope:Neon-29; Ne-29Symbol:²⁹Ne or 2910NeMass number A:29 (= number of nucleons)Atomic number Z:10 (= number of protons)Neutrons N:19Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.9 (= neutron-proton ratio)Neutron excess (N-Z):9Isotopic mass:29.019750(160) u (atomic weight of Neon-29)Nuclide mass:29.0142642 u (calculated nuclear mass without electrons)Mass excess:18.39701 MeVMass defect:0.223133724 u (per nucleus)Nuclear binding energy:207.8477251 MeV (per nucleus)
7.16716293 MeV (average binding energy per nucleon)Separation energy:S_N = 0.971(196) MeV (first neutron)
S_P = 22.293(192) MeV (first proton)Half-life:14.7(4) msDecay constant λ:47.152869425847 s^-1Specific activity α:9.791766263194 × 10⁺²³ Bq g^-1
26464233143770 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Year of discovery:1985

Radioactive Decay

Half-life T_½ = 14.7(4) ms respectively 1.47 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	²⁹Na	68.0(51) %	15.720(150) MeV
β^-, n	²⁸Na	28(5) %	11.317(150) MeV
β^-, 2n	²⁷Na	4(1) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 29) with Neon-29. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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