|A continuous transfer of energy|
This image of a ‘bubble chamber’ shows charged particles gradually depositing their energy along their trajectory. Bubble chambers were large detectors built in the 1960’s and ‘70’s and installed on the trajectories of high energy particles produced by large accelerators. This particular image shows the annihilation of an antiproton coming from the left with a target proton in the liquid hydrogen filling the chamber. The antiproton and the eight particles produced by the annihilation ionize the liquid nitrogen, causing it to heat up and produce microscopic bubbles which allow for identification.