Elastic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pd</mml:mi></mml:math>scattering with 200–300 MeV protons

Abstract

We have measured the $\mathrm{pd}$ elastic scattering with an electron-cooled beam of a proton storage ring and an internal jet target operated with HD gas. The accurately known H/D ratio is used to transfer the precision of existing $\mathrm{pp}$ scattering data to the $\mathrm{pd}$ cross sections. Measurements were performed for proton energies between 200 and 300 MeV in the angular range $11\ifmmode^\circ\else\textdegree\fi{}&lt;~{\ensuremath{\Theta}}_{\mathrm{c}.\mathrm{m}.}&lt;~ 29\ifmmode^\circ\else\textdegree\fi{}.$ The results are compared to nonrelativistic Faddeev calculations with different nucleon-nucleon interactions and total angular momenta $j&lt;~5$ in the $\mathrm{NN}$ subsystem. The impact of a genuine $3N$ force is investigated. The discrepancies between data and calculations increase with projectile energy.