Neck Rupture in Fission (IMAGE) DOE/Oak Ridge National Laboratory Caption Researchers from the University of Washington, Seattle, and Los Alamos National Laboratory used the Summit supercomputer to conduct the first fully microscopic, quantum many-body simulation of a nucleus’s "neck rupture" as it undergoes fission. The left/right columns show a time series of the neutron/proton number densities in log scale for a typical fission trajectory. The bar relates the color to the decimal logarithm of the number density. Credit Image: Los Alamos National Laboratory Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.