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H. Pieter Mumm

My research interests focus on testing the Standard Model of particle physics through precision measurement. Recent examples include a test of time-reversal invariance in neutron beta decay that shed light on the matter-anitmatter asymmetry of the universe, a first observation of neutron radiative decay, and a precision measurement of the neutron lifetime using a fundamentally new technique.

During the last several years I have become interested in anomalies associated with the flux and spectral shape of antineutrinos from nuclear reactors. These anomalies either point toward problems with the nuclear physics calculations of the expected neutrino flux, or, intriguingly the possible existence of a new particle, a so-called sterile neutrino. I am currently co-spokeperson for the PROSPECT experiment which expects to make a high precision spectrum measurement and test the sterile neutrino hypothesis to high significance. In related work, I am involved in efforts to detect reactor antineutrinos with compact portable detectors for safeguards and monitoring purposes.

Finally, I am involved in efforts to improve fast neutron spectroscopy technology.

Professional Affiliations:

  • Member American Physical Society (Division of Nuclear Physics, Topical Group on Precision Measurements and Fundamental Constants)
  • Member American Physical Society Division of Nuclear Physics program committee
  • University of Maryland Affiliate


Radiation Physics Division
Neutron Physics Group

Employment History:

NIST, 2008 - present


Ph.D., Physics, University of Washington, Seattle, 2004


Phone: 301-975-8355
Email: hans.mumm@nist.gov
Fax: 301-926-1604