Silicon-22

Properties and data of the isotope ²²Si.

Content

General data

Name of the isotope:Silicon-22; Si-22Symbol:²²Si or 2214SiMass number A:22 (= number of nucleons)Atomic number Z:14 (= number of protons)Neutrons N:8Isotopic mass:22.03579(54) u (atomic weight of Silicon-22)Nuclide mass:22.02811 u (calculated nuclear mass without electrons)Mass excess:33.33817 MeVMass defect:0.143079776 u (per nucleus)Nuclear binding energy:133.27795287 MeV (per nucleus)
6.05808877 MeV (average binding energy per nucleon)Separation energy:
S_P = 0.94(78) MeV (first proton)Half-life:29(2) msDecay constant λ:23.90162691586 s^-1Specific activity α:6.54268018495 × 10⁺²³ Bq g^-1
17682919418792 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Oxygen-22Year of discovery:1987

Radioactive Decay

Half-life T_½ = 29(2) ms respectively 2.9 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	²²Al	68(4) %	15.14(64) MeV
β⁺, p	²¹Mg	32(4) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 8) and isobaric (same nucleon number A = 22) with Silicon-22. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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