Hans Pieter Mumm

Dr. H. Pieter Mumm is a physicist and leader of the Neutron Physics Group at the National Institute of Standards and Technology. His research tests the foundations of the Standard Model through precision neutron measurements, including tests of time-reversal invariance that probe the matter-antimatter asymmetry of the universe, the first observation of neutron radiative decay, and precision neutron lifetime measurements using novel trapping methods. He currently co-leads a beam-based neutron lifetime measurement counting decay protons from a cold neutron beam with a precisely determined flux. His metrology work includes precise neutron source calibrations using a manganese bath and development of fast neutron detectors for applications from source calibration to neutron spectroscopy. As co-spokesperson for the PROSPECT experiment, Dr. Mumm helped perform high-precision measurements of reactor antineutrinos, playing a significant role in addressing anomalies hinting at the existence of sterile neutrinos. Dr. Mumm holds a Ph.D. from the University of Washington.