Pion star in photographic emulsion

Pion star in photographic emulsion

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Caption: This "pion star" recorded in photographic emulsion is typical of the kind of subatomic interaction that occurs in pion beam cancer therapy. A negative pion (or pi-minus) enters from the left; it changes direction twice before colliding with an oxygen nucleus in the gelatin of the emulsion & breaking it into many fragments. Two protons shoot off, one to upper left, the other to bottom right; an alpha particle moves towards top right, while a second alpha & a tritium nucleus head down the picture, left of the lower proton. In cancer ther- apy with negative pion beams, oxygen nuclei are the most common "targets" in the malignant tissue.

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Keywords: alpha particle, atomic, cancer therapy, emulsion photo, emulsion photograph, image, in physics, nuclear emulsion, nucleus, particle, particle physics, pion, pion beam, pion beam cancer therapy

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