Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Thomas R. Gentile (Assoc)

Dr. Thomas R. Gentile’s research has focused primarily on the development and application of polarized 3He-based neutron spin filters to neutron scattering, fundamental neutron physics and polarized neutron imaging. These devices rely on the large spin dependence of the absorption of neutrons by 3He gas, which is nuclear spin-polarized by optical pumping. Dr. Gentile was recently a co-author on a review paper that covers the optical pumping methods and the use of polarized 3He for a variety of applications. Dr. Gentile has also has contributed to other fundamental neutron physics experiments, in particular the neutron radiative decay experiment.

Dr. Gentile has been a member of the Neutron Physics group since 1996, after working in optical power measurements in the Radiometric Physics Division for his first three years at NIST. Before coming to NIST in 1993, he was a postdoctoral fellow at the California Institute of Technology, where he was introduced to polarized 3He for application to nuclear physics targets. He received his Ph.D. in Physics from the Massachusetts Institute of Technology in 1990 with a thesis in atomic physics under Prof. Daniel Kleppner entitled “Microwave Spectroscopy and Atom-Photon Interactions in Rydberg States of Calcium” and his B.S. in Physics from the State University of New York at Stony Brook in 1979. 

Dr. Gentile’s NIST awards include a Bronze Medal (2018) and an Allen V. Astin Award (2011). He was elected to Fellowship in the American Physical Society in 2009 through the Topical Group on Precision Measurements and Fundamental Constants. Dr. Gentile is an author on about 130 publications and conference proceedings.


Neutron Polarimetry Using a Polarized 3He Cell for the aCORN Experiment

Benjamin C. Schafer, W A. Byron, Wangchun Chen, B Collett, Maynard S. Dewey, Thomas R. Gentile, Md. T. Hassan, Gordon L. Jones, Alexander Komives, Fred E. Wietfeldt
The neutron polarization of the NG-C beamline at the NIST Center for Neutron Research was measured as part of the aCORN neutron beta decay experiment. Neutron t

Electric-field imaging using polarized neutrons

Y.- Y. Jau, Daniel S. Hussey, Thomas R. Gentile, Wangchun Chen
We experimentally demonstrate that electrically neutral particles, neutrons, can be used to directly visualize the electrostatic field inside a target volume
Created October 9, 2019, Updated February 3, 2023