Positron

[1822.88850204(77)]−1 u[note 1]

Positron
Tahasik (positron)
Cloud chamber photograph by C.D. Anderson of the first positron ever identified. A 6 mm lead plate separates the upper half of the chamber from the lower half. The positron must have come from below since the upper track is bent more strongly in the magnetic field indicating a lower energy.
KomposisyonElementaryong partikulo
EstadistikaFermioniko
HenerasyonUna
Mga interaksiyonDagsin, Dagitabbalani, Mahinang interaksiyon
Simboloβ+, e+
AntipartikuloDagisik
Nag-teorisaPaul Dirac (1928)
NatuklasanCarl D. Anderson (1932)
Masa5.4857990943(23)×10−4 u[1]

[1822.88850204(77)]−1 u[note 1]

0.510998910(13) MeV/c2[1]
Elektrikong karga+1 e
1.602176487(40)×10−19 C[1]
Ikot1⁄2

Ang tahasik (positron) o labandagisik (antielectron) ang antipartikulo o antimateryang kapilas(counterpart) ng dagisik. Ang positron ay may elektrikong kargang +1e, ikot na ½, at parehong masa katulad ng sa dagisik. Kapag ang mababang enerhiyang tahasik ay bumangga sa mababang enerhiyang elektron, ang anihilasyon ay mangyayari na magreresulta sa produksiyon ng dalawa o higit pang sinag gamma na photon. Ang mga tahasik ay maaaring likhain sa pamamagitan ng emisyong positron na radioaktibong pagkabulok sa pamamagitan ng mahinang interaksiyon o sa pamamagitan produksiyong pares mula sa sapat na enerhetikong photon.

Sanggunian

  1. ↑ The fractional version's denominator is the inverse of the decimal value (along with its relative standard uncertainty of 4.2×10−10).
  1. ↑ 1.0 1.1 1.2 The original source for CODATA is:
    Mohr, P.J.; Taylor, B.N.; Newell, D.B. (2006). "CODATA recommended values of the fundamental physical constants". Reviews of Modern Physics. 80 (2): 633–730. Bibcode:2008RvMP...80..633M. doi:10.1103/RevModPhys.80.633.
    Individual physical constants from the CODATA are available at:
    "The NIST Reference on Constants, Units and Uncertainty". National Institute of Standards and Technology. Nakuha noong 2009-01-15.

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