Nuclear fusion from Coulomb explosions of deuterated methane clusters subjected to ultraintense femtosecond laser pulses |
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Authors: | Lu Hai-Yang Wang Cheng Chen Guang-Long Kim Cheol-Jung Liu Jian-Sheng Ni Guo-Quan Li Ru-Xin and Xu Zhi-Zhan |
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Institution: | State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; Korea Atomic Energy Research Institute, Yusung, Taejon 305-353, Korea |
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Abstract: | This paper reports that Coulomb explosions taken place in the
experiment of heteronuclear deuterated methane clusters
((CD4)2) in a gas jet subjected to intense femtosecond
laser pulses (170mJ, 70fs) have led to table-top laser driven DD
nuclear fusion. The clusters produced in supersonic expansion had an
average size of about 5nm in radius and the laser intensity used
was 3×1017W/cm2.The measured maximum and average
energies of deuterons produced in the laser--cluster interaction were
60 and 13.5keV, respectively. From DD collisions of energetic
deuterons, a yield of 2.5(±0.4)×104 fusion neutrons
of 2.45MeV per shot was realized, giving rise to a neutron
production efficiency of about 1.5×105 per joule of
incident laser pulse energy. Theoretical calculations were performed
and a fairly good agreement of the calculated neutron yield with
that obtained from the present experiment was found. |
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Keywords: | molecular clusters Coulomb
explosion DD nuclear fusion intense femtosecond lasers |
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