Hiperon
’nHiperonis ’n subatomiesedeeltjie.Dit is enigebarionwat bestaan uit een of meervreemd-kwarke,maar geensjarme- ofonder-kwarkenie. Hulle is onstabiel en anders asnukleoneword hulle nie normaalweg inmateriewaargeneem nie.Atoomkernswat hiperone bevat, word hiperkerns genoem.
Die naam van die hiperon hang af van die getal vreemd-kwarke (s-kwarke), dus syvreemdheid:
- 1 s-kwark: Lambda (Λ)-barion
- 2 s-kwarke: Xi (Ξ)-barion
- 3 s-kwarke: Omega (Ω)-barion
Die volgende hiperone bestaan:
| Hiperon | Kwarke | Spin | Isospin | Vreemdheid | MassainMeV | Lewensduur in s | Vervalkanaal |
|---|---|---|---|---|---|---|---|
| Λ | uds[1] | 1/2+ | 0 | −1 | 1115,683(6) | 2,631(20) × 10−10 | pπ−,nπ0 |
| Σ+ | uus | 1/2+ | 1 | −1 | 1189,37(7) | 0,8018(26) × 10−10 | pπ0,nπ+ |
| Σ0 | uds | 1/2+ | 1 | −1 | 1192,642(24) | 7,4(7) × 10−20 | Λγ |
| Σ− | dds | 1/2+ | 1 | −1 | 1197,449(30) | 1,479(11) × 10−10 | nπ− |
| Ξ0 | uss | 1/2+ | 1/2 | −2 | 1314,86(20) | 2,90(9) × 10−10 | Λπ0 |
| Ξ− | dss | 1/2+ | 1/2 | −2 | 1321,71(7) | 1,639(15) × 10−10 | Λπ− |
| Ω− | sss | 3/2+ | 0 | −3 | 1672,45(29) | 0,821(11) × 10−10 | ΛK−,Ξ0π−,Ξ−π0 |
| Σ*+(1385)[2] | uus | 3/2+ | 1 | −1 | 1382,8(4) | Λπ, Σπ | |
| Σ*0(1385)[2] | uds | 3/2+ | 1 | −1 | 1383,7±1,0 | Λπ, Σπ | |
| Σ*−(1385)[2] | dds | 3/2+ | 1 | −1 | 1387,2(5) | Λπ, Σπ | |
| Ξ*0(1530)[3] | uss | 3/2+ | 1/2 | −2 | 1531,80(32) | Ξπ | |
| Ξ*−(1530)[3] | dss | 3/2+ | 1/2 | −2 | 1535,0(6) | Ξπ |
Verwysings
[wysig|wysig bron]- ↑u =op-kwark,d =af-kwark,s =vreemd-kwark
- ↑2,02,12,2"Particle Data Groups: 2006 Review of Particle Physics – Sigma(1385)"(PDF; 135 kB).Besoek op20 April2008.
- ↑3,03,1"Particle Data Groups: 2006 Review of Particle Physics – Xi(1530)"(PDF; 89 kB).Besoek op20 April2008.
