D-D REACTIONS BELOW 500-KEV

The d(d, n)3He and d(d, p)T reactions are studied for deuteron energies below 500 keV. The semi-phenomenological model of Konopinski and Teller is criticized and shown to be applicable to at most a few hundred keV. A new, simpler and in principle quantitative description is given for these energies. The low-energy data are analysed qualitatively in the first part of the paper. The energy dependence of the cross sections and the ratio of the cross sections for both reactions can very well be described in this way. It has been rediscovered that the ratio A2/A0 of anisotropy coefficients ought not to be zero at zero deuteron energy, thus the cross section not isotropic, and the data of Eliot and Theus agree now very well. Moreover the polarization of the outgoing nucleons must not necessarily vanish in the limit of zero deuteron energy. With regard to the experiments with a polarized deuteron beam it is not necessary to assume a narrow resonance at about 100 keV. A simplified quantitative calculation with Hamada and Johnston potentials gives a l = 1 contribution in the cross sections that is too small. This supports the assumption of large effects of the negative parity states of the α-particle at 21.4 (0-) and 22.4 (2-) MeV. © 1969.