The astrophysical S-factor for dd-reactions at keV-energy range

The experimental results of measurements of the astrophysical S-factor for dd-reaction at keV-energy range collision energies using liner plasma techn ique are presented. The experiments were carried out at the high current ge nerator of the Institute of High-Current Electronics in Tomsk, Russia. The measured vales of the S-factors for the deuteron collision energies 1.80, 2 .06 and 227 keV are S-dd = (114 +/- 68), (64 +/- 30), (53 +/- 16) b . keV, respectively. The corresponding cross sections for dd-reactions, described as a product of the barrier factor and measured astrophysical S-factor, are sigma (n)(dd) (E-col = 1.80 keV) = (4.3 +/-2.6) . 10(-33) cm(2); sigma (n) (dd) (E-col = 2.06 keV) = (9.8 +/- 4.6) . 10(-33) cm(2); sigma (n)(dd) (E-c ol=2.27 keV) = (2.1 +/- 0.6) . 10(-32) cm(2).