Emisi neutron
Emisi neutron adalah sejenis peluruhan radioaktif dari atom yang mengandung kelebihan neutron, di mana sebuah neutron secara langsung dikeluarkan dari nukleus. Emisi neutron adalah salah satu cara atom mencapai kestabilannya. An atom is unstable, therefore radioactive, when the forces in the nucleus are unbalanced. The instability of the nucleus results from the nuclei having extra neutrons or extra protons. Two examples of isotopes that emit neutrons are beryllium-13 (mean life 2,7×10−21 s) and helium-5 (7×10−22 s). Commonly, it is abbreviated with a lower case n.
As only a neutron is lost in this process, the atom does not gain or lose any protons, and so it does not become an atom of a different element. Instead, the atom will become a new isotope of the original element, such as beryllium-13 becoming beryllium-12 after emitting one of its neutrons.[1]
Neutron emitters to the left of lower dashed line (see also: Table of nuclides) Z → 0 1 2 n ↓ n H He 3 4 5 0 1H Li Be B 6 1 1n 2H 3He 4Li 5Be 6B C 7 2 3H 4He 5Li 6Be 7B 8C N 8 3 4H 5He 6Li 7Be 8B 9C 10N O 9 4 5H 6He 7Li 8Be 9B 10C 11N12O F 10 13 5 6H 7He 8Li 9Be 10B 11C 12N 13O 14F Ne 11 12 Al 6 7H 8He 9Li 10Be 11B 12C 13N 14O 15F 16Ne Na Mg 19Al 14 7 9He 10Li11Be 12B 13C 14N 15O 16F 17Ne 18Na 19Mg 20Al Si 8 10He 11Li 12Be 13B 14C 15N 16O 17F 18Ne 19Na 20Mg 21Al 22Si 9 12Li 13Be 14B 15C 16N 17O 18F19Ne 20Na 21Mg 22Al 23Si 10 14Be 15B 16C 17N 18O 19F 20Ne 21Na 22Mg 23Al24Si 11 15Be 16B 17C 18N 19O 20F 21Ne 22Na23Mg 24Al25Si 12 16Be 17B 18C 19N 20O 21F 22Ne 23Na 24Mg 25Al 26Si 13 19C 20N 21O 22F 23Ne 24Na25Mg 26Al27Si 14 20C 21N 22O 23F 24Ne 25Na 26Mg 27Al 28Si
Referensi
- ^ "Neutron Emission" (webpage). Diakses tanggal 2014-10-30.
Pranala luar
- "Why Are Some Atoms Radioactive?" EPA. Environmental Protection Agency, n.d. Web. 31 Oct. 2014.
- The LIVEChart of Nuclides - IAEA with filter on delayed neutron emission decay
- Nuclear Structure and Decay Data - IAEA with query on Neutron Separation Energy