Cloud chamber image showing neutrons

Cloud chamber image showing neutrons

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Credit: LAWRENCE BERKELEY LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Neutrons have no electric charge & are therefore not visible in cloud chamber & bubble chamber photographs, but their presence can be betrayed by their effect on other, charged particles. In this false-colour cloud chamber photo, a narrow beam of neutrons enters from below. The chamber is filled with hydrogen gas saturated with a mixture of ethyl alcohol & water. Three neutrons induce transmutations of oxygen & carbon atoms in the alcohol, give rising to three "stars", one above the other. The tracks of subatomic particles prod- uced in these transmutations have been coloured according to which "star" they belong to.

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Keywords: cloud chamber image, neutron, odyssey, particle physics, photo, subatomic track, tracks

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