Effect of the H-Atom Zero-Point Motion on the Doppler Width of the N-P Capture Gamma Line

Details Effect of the H-Atom Zero-Point Motion on the Doppler Width of the N-P Capture Gamma Line Effect of the H-Atom Zero-Point Motion on the Doppler Width of the N-P Capture Gamma Line

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..581m&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Physics

Scientific paper

The Doppler broadening of photons emitted during the n-p capture process in a nuclear reactor is considered in view of a new finding concerning the zero-point motion of the H-atom in the sample. The kinetic energy of the H-atoms of a Kapton sample (used in a recent determination of the deuteron binding energy1) was measured directly at 296 K. It was found to correspond to an effective temperature of 991 K. This means that the H-atom contribution to the broadening of the n-p capture γ line is more important than that of the thermal neutrons. A simple expression for calculating the Doppler broadening of the emitted photons in terms of the kinetic energies of the neutron and the proton is deduced. The expression is applicable to any capturing nucleus and not just to the proton.

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