W182(d,p)W183Reaction at 7.5 and 12 MeV: An Investigation of the Stripping Process on a Deformed Heavy Nucleus

Abstract

The ${\mathrm{W}}^{182}\mathrm{}(d,p)\mathrm{}{\mathrm{W}}^{183}$ reaction has been studied at 7.5 and at 12 MeV with a broad-range magnetic spectrograph. At 12 MeV, angular distributions have been obtained from 5° to 145° for the transitions to the ground state and to the levels at excitations of 46, 99, 208, 292, 412, and 453 keV. In addition, the scattering of deuterons on ${\mathrm{W}}^{182}$ and protons on ${\mathrm{W}}^{183}$ has been measured at 12 MeV. The elastic scattering has been analyzed in terms of the nuclear optical model. A serious ambiguity in the deuteron parameters has been observed. For inelastic deuteron scattering leaving ${\mathrm{W}}^{182}$ in its first excited state, a distorted-wave Born-approximation (DWBA) analysis based on a deformed complex potential leads to a deformation parameter $\beta =0.23\mathrm{}$ for ${\mathrm{W}}^{182}$. The angular distributions of the ${\mathrm{W}}^{182}\mathrm{}(d,p)\mathrm{}{\mathrm{W}}^{183}$ reaction have been compared with DWBA calculations with different distorting potentials, and spectroscopic factors have been extracted. The ratios of the experimental spectroscopic factors agree quite well with those predicted by the Nilsson model, when band mixing is included in the calculation of the theoretical spectroscopic factors. Absolute spectroscopic factors, on the other hand, may disagree by as much as a factor of 2-3. The data have also been compared with the DWBA calculations of Penny and Satchler, which include "two-step" processes. Our results indicate that "two-step" processes are probably unimportant for the reaction studied.