Proton-induced deuteron breakup at GeV energies with forward emission of a fast proton pair

Abstract

A study of the deuteron breakup reaction pd → (pp)n with forward emission of a fast proton pair with small excitation energy E pp < 3 MeV has been performed using the ANKE spectrometer at COSY-Jülich. An exclusive measurement was carried out at six proton-beam energies T p = 0.6, 0.7, 0.8, 0.95, 1.35, and 1.9 GeV by reconstructing the momenta of the two protons. The differential cross section of the breakup reaction, averaged up to 8 • over the cm polar angle of the total momentum of the pp pairs, has been obtained. Since the kinematics of this process is quite similar to that of backward elastic pd → dp scattering, the results are compared to calculations based on a theoretical model previously applied to the pd → dp process.

Three-body scattering at intermediate energies

“…Finally we comment on a recently measured and analyzed reaction pd → (pp)n at high momentum transfer [29,30]. In this experiment the break-up configuration has been chosen such that the neutron is ejected at extreme backward angles, and the two protons at extreme forward angles.…”

Precision Measurement of the Quasifreepn→dϕReaction Close to Threshold

“…The luminosity was then obtained from estimates [12] of the corresponding differential cross sections within the Glauber formalism [13]. This technique has been used successfully at other energies [14]. Though the two methods give consistent results to within 3%, the error in the pd technique is about 10%, due mainly to the use of the theoretical model and uncertainty in the acceptance correction.…”

Vector and tensor analysing powers in deuteron–proton breakup reactions at intermediate energies

“…3 as functions of q, separately for the two E pp bins. The resolution in E pp is about 0.3 MeV at 3 MeV and better at lower E pp [20]. Due to the limited ANKE angular coverage, the acceptance gets steadily poorer as q and E pp increase, so that values of A yy could only be determined for q < 130 MeV/c, with a slightly lower limit in the case of A xx .…”