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.

Effects of high intensity neutron flux on in-situ spin-exchange optical pumping of He-3



Thomas R. Gentile, E Babcock, Stephen Boag, C. Becham, T E. Chupp, Gordon L. Jones, A K. Petukhov, T G. Walker


Prior studies revealed neutron beam-induced alkali-metal spin relaxation in 3He cells polarized in-situ by spin-exchange optical pumping. These effects are minor for neutron beams of low to moderate intensity, but become important at the highest neutron flux levels available in the full spectrum beams of high flux neutron sources. It was found that the relaxation consisted of a fast and a slow component, but the origin of neither is understood. This work further explored the mechanisms of this effect by measuring the magnitude and time dependence of alkali-metal spin-relaxation rates as a function of N2 and 3He composition. The experiments were performed on a thermal neutron beam line at the Institut Laue-Langevin with a maximum neutron flux of 2.4x10^9 cm^-2 s^-1.
Journal of Physics Conference Proceedings


beam-induced, He-3, neutron


, T. , Babcock, E. , Boag, S. , , C. , Chupp, T. , Jones, G. , Petukhov, A. and Walker, T. (2009), Effects of high intensity neutron flux on in-situ spin-exchange optical pumping of He-3, Journal of Physics Conference Proceedings, [online], (Accessed May 20, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 17, 2009, Updated February 19, 2017