Probing alpha -particle wave functions by (d, alpha ) tensor analyzing powers.

Abstract

Components of \ensuremath{\alpha}-particle wave functions corresponding to d-d configurations are used to predict analyzing powers in the (d,\ensuremath{\alpha}) reaction. Tensor analyzing powers, especially ${\mathit{A}}_{\mathit{x}\mathit{x}}$, are shown to clearly distinguish between wave functions generated by different realistic nucleon-nucleon interactions. Data for the $^{58}\mathrm{Ni}$(d,\ensuremath{\alpha}${)}^{56}$Co reaction to the ${7}^{+}$ stretched-nucleon-orbital state at 2.283-MeV excitation in $^{56}\mathrm{Co}$, measured with 22-MeV deuterons, are compared to predictions from the Argonne and Urbana interactions. Similar comparisons are made to data for the lowest ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$=${7}^{+}$ state in $^{48}\mathrm{Sc}$ populated by the $^{50}\mathrm{Ti}$(d,\ensuremath{\alpha}${)}^{48}$Sc reaction at 16 MeV.