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Brookhaven National Laboratory H3

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Brookhaven National Laboratory H3

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$20.00
Image title: 
Photograph taken in a 20-inch liquid hydrogen bubble chamber of an anti-proton (1) colliding with a proton
Credit line: 
Photo courtesy Brookhaven National Laboratory. For Publication Permission Request contact Jane Koropsak, BNL-Media and Communications, jane@bnl.gov, Tel: 631-344-4909
Description: 

Photograph taken in a 20-inch liquid hydrogen bubble chamber of an anti-proton (1) colliding with a proton. The accompanying sketch shows the event with the proper assignment of a particle to each track. At the vertex of the anti-proton track, a collision occurs with the stationary proton in the liquid hydrogen. Track 2 is that of a positive pi-meson, while track 3 is identified as a cascade hyperon, which decays into other particles (tracks 9, 4, 5, and 6). The third product of the initial anti-proton collision is the anti-Xi-zero particle; since it has no electrical charge it leaves no track, but its direction of travel is shown in 10. This particle then decays into an anti-lambda-zero (11), and a neutral pi-meson (12), which also leave no tracks. The subsequent decay products of the anti-lambda particle, however, do leave tracks (7 and 8). From these decay products, and other phenomena, the preceding chain of events can be deduced, making it possible for the first time to identify the production of the rare anti-Zi-zero particle.

Photo date: 
circa 1963
Original format: 
2 photographic prints (black and white; 9 x 7.5 inches and 8 x 7 inches)
Person(s): 
Brookhaven National Laboratory
Category: