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A Li ion from a  10 B( n , α  γ )  7 Li reaction induced by a thermal neutron undergoes a large degradation due to its high stopping power in a medium. This phenomenon influences the peak line shape of the 477.6 keV gamma line emitted from an excited  7 Li nucleus recoiled by an energetic alpha particle and the peak line shape in a spectrum varies according to the slowing-down media. A numerical study for the analysis of the line shape has been conducted by performing a parametric search and fitting the measured spectrum in a least squares approach by Choi  et al.  and implemented in a recent version of HYPERGAM code. In this study, the gamma-ray spectra were measured for various media like elemental boron, boric acid, borax, boron carbide, boron steel and so on at a SNU-KAERI prompt gamma activation analysis facility of the HANARO research reactor in Korea Atomic Energy Research Institute. The degradation constant was determined for various slowing-down media.

Determination of degradation constant of Li ion from 10 B( n , α γ ) 7 Li reaction in various media