The yield of α particles in neutronless fusion reactions B11+p in plasmas produced by picosecond laser pulses with the peak intensity of 2×1018W/cm2 has been observed. Experiments were carried out on the “Neodymium” laser facility at the pulse energy of 10-12J and pulse duration of 1.5ps . The composite targets B11+(CH2)n were used. The yield of 103 α particles per pulse has been observed. The energy spectrum of α particles contains two maxima: at 3-4MeV and at 6-10MeV . The first of these peaks corresponds to the secondary α12 particles at the decay of the intermediate first excited state of Be8 , whereas the second peak demonstrates generation of α1 particles in the reaction B11+p with the production of this excited state. Simultaneous measurements of neutrons result in zero yield, which proves the observation of neutronless fusion reactions in our experiments.
Physical Review E
- Pub Date:
- August 2005
- Light-ion inertial confinement;
- Laser-driven acceleration;
- Plasma production and heating by laser beams;
- X-ray gamma-ray and particle generation