Neutrinos are “ghostly” particles, interacting only rarely with matter. Coherent elastic neutrino-nucleus scattering (CEvNS) was first predicted in 1973; it’s a process in which a neutrino scatters off an entire nucleus. By neutrino standards, CEvNS occurs frequently, but it is tremendously challenging to see. The only way to observe it is to detect the minuscule thump of the nuclear recoil. CEvNS was measured for the first time by the COHERENT collaboration using the unique, high-quality source of neutrinos from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. This talk will describe COHERENT's recent measurement of CEvNS, the status and plans of COHERENT's suite of detectors at the SNS, and the physics we will learn from the measurements.

The Helmut W. Baer Lecture is a special colloquium supported by family and friends in honor of Dr. Helmut Baer. Dr. Baer's career in physics began with his work at the University of Michigan where he was awarded a doctorate in nuclear physics in 1967. He published over 100 articles that cover a range of physics topics including nuclear physics and pion interactions. Dr. Baer was named a Fellow of the American Physical Society in March of 1989, and to his delight enjoyed countless opportunities over the years to talk about physics at universities and conferences internationally. Dr. Baer set the highest personal standards for himself and his research. This lecture is held approximately every two years.