Nuclear interactions in a bubble chamber, as a result of the bombardment of liquid hydrogen by a beam of 2.85 BeV protons from the Cosmotron.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/37916456@N02">ENERGY.GOV</a>
circa 1960 <div style="display: none;">date QS:P,+1960-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/departmentofenergy/12000818023/">HD.6D.680</a>