Το ποζιτρόνιο λέγεται αλλιώς και αντιηλεκτρόνιο. Είναι το αντισωματίδιο του ηλεκτρονίου (αν η ύλη είναι το ηλεκτρόνιο, το ποζιτρόνιο είναι η αντιύλη), δηλαδή έχει ίδια μάζα με αυτό, αλλά φορτίο +1. Όταν ένα χαμηλής ενέργειας ποζιτρόνιο συγκρούεται με ένα χαμηλής ενέργειας ηλεκτρόνιο εκμηδενίζονται και λόγω αυτού παράγονται δύο ή περισσότερα φωτόνια ακτίνων γ.
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Το ποζιτρόνιο λέγεται αλλιώς και αντιηλεκτρόνιο. Είναι το αντισωματίδιο του ηλεκτρονίου (αν η ύλη είναι το ηλεκτρόνιο, το ποζιτρόνιο είναι η αντιύλη), δηλαδή έχει ίδια μάζα με αυτό, αλλά φορτίο +1. Όταν ένα χαμηλής ενέργειας ποζιτρόνιο συγκρούεται με ένα χαμηλής ενέργειας ηλεκτρόνιο εκμηδενίζονται και λόγω αυτού παράγονται δύο ή περισσότερα φωτόνια ακτίνων γ.