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Particle tracks (pi-mu-e decay)

Particle tracks (pi-mu-e decay)

A136/0031

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Credit

PROF. G. PIRAGINO / SCIENCE PHOTO LIBRARY PROF. G. PIRAGINO / SCIENCE PHOTO LIBRARY

Caption

Streamer chamber photo of a pion-muon-electron (pi-mu-e) decay chain resulting from an antiproton annihilation. The antiproton enters from the bottom of the picture & annihilates with a proton in neon gas filling the chamber; their energy materialises as 3 nuclear fragments (thick tracks) & several pions (less dense tracks). One positive pion curls tightly to the right in the chamber's magnetic field before decaying to a muon; the muon forms the spiral at top before decaying to a positron (or anti-electron). At each decay the tracks change direction sharply, indicating emission of an unseen neutrino. Photo taken at Experiment PS 179 at CERN, Geneva.

Release details

Model release not required. Property release not required.

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