Abstract
Abstract The present paper is devoted to the study of the electron screening effect influence on the rate of d ( d , n ) He 3 reaction in the ultralow deuteron collision energy range in the deuterated metals (ZrD 2 , TiD 2 and TaD 0.5 ). The ZrD 2 , TiD 2 and TaD0.5 targets were fabricated via magnetron sputtering of titanium, zirconium and tantalum in gas (deuterium) environment. The experiments have been carried out using the high-current pulsed Hall plasma accelerator (NSR TPU, Russia). The detection of neutrons with energy of 2.5 MeV from the dd reaction was done with plastic scintillation spectrometers. As a result of the experiments, the energy dependences of the astrophysical S -factor for the dd reaction in the deuteron collision energy range of 2–7 keV and the values of the electron screening potential U e of the interacting deuterons have been measured for the above targets: U e ( ZrD 2 ) = ( 205 ± 35 ) eV ; U e ( TiD 2 ) = ( 125 ± 34 ) eV ; U e ( TaD 0.5 ) = ( 313 ± 58 ) eV . Our results are compared with the other published experimental and calculated data.
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