Physics – Plasma Physics
Scientific paper
2008-12-12
Published in Phys. Rev. E 79, 038401 (2009)
Physics
Plasma Physics
3 figures, accepted for publication in the Comment section of Physical Review E
Scientific paper
10.1103/PhysRevE.79.038401
The paper by Belyaev et al. [Phys. Rev. E {\bf 72}, 026406 (2005)] reported the first experimental observation of alpha particles produced in the thermonuclear reaction $^{11}$B($p,\alpha$)$^{8}$Be induced by laser-irradiation on a $^{11}$B polyethylene (CH$_2$) composite target. The laser used in the experiment is characterized by a picosecond pulse duration and a peak of intensity of 2$\times10^{18}$ W/cm$^2$. We suggest that both the background-reduction method adopted in their detection system and the choice of the detection energy region of the reaction products are possibly inadequate. Consequently the total yield reported underestimates the true yield. Based on their observation, we give an estimation of the total yield to be higher than their conclusion, i.e., of the order of 10$^5 \alpha$ per shot.
Anzalone Alessandro
Bonasera Aldo
Kimura Sachie
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