Nyob rau hauv particle physics, kev puas tsuaj yog txheej txheem uas tshwm sim thaum lub subatomic particle collides nrog nws cov antiparticle los tsim lwm yam particles, xws li ib tug electron tsoo nrog ib tug positronlos tsim ob photons.
Thaum ib qho hluav taws xob thiab positron puas tsuaj?
Electron-positron kev puas tsuaj yogtxheej txheem uas positron tsoo nrog ib qho hluav taws xob uas ua rau muaj kev puas tsuaj ntawm ob qho tib si. Electrons (los yog β- particles) thiab positrons (los yog β + particles) yog qhov sib npaug, tab sis cov nqi sib txawv. Positrons yog cov tshuaj tiv thaiv sib npaug ntawm cov hluav taws xob, tsim los ntawm B + lwj.
Yuav ua li cas thaum positron thiab electron sib tsoo?
Thaum ib qho hluav taws xob thiab positron (antielectron) sib tsoo ntawm lub zog siab, lawv tuaj yeem rhuav tshem los tsim cov quarks ntxim nyiam uas tom qab ntawd tsim D+ thiab D - mesons.
Thaum ib qho hluav taws xob thiab cov positron sib tsoo lawv rhuav tshem thiab tag nrho lawv cov huab hwm coj hloov mus rau hauv lub zog lub zog tso tawm los ntawm kev rhuav tshem ntawm ib khub electron positron yog?
Tag nrho cov zog ntawm lub zog tso tawm thaum lub positron thiab ib qho hluav taws xob rhuav tshem yog 1.022 MeV, sib raug rau qhov sib xyaw ua ke ntawm lub zog ntawm positron thiab electron. Lub zog yog tso tawm nyob rau hauv daim ntawv ntawm photons. Tus naj npawb ntawm photons nyob ntawm seb qhov positron thiab electron puas tsuaj.
Particle rhuav tshem yog dab tsi?
Kev rhuav tshem, hauv physics, reaction nyob rau hauv uas ib tug particle thiab nws antiparticle sib tsoo thiab ploj, tso lub zog. Kev puas tsuaj ntau tshaj plaws hauv ntiaj teb tshwm sim ntawm ib qho hluav taws xob thiab nws cov tshuaj tiv thaiv, ib qho positron.
