Antiproton scattering off3He and4He nuclei at low and intermediate energies

Abstract

Antiproton scattering off 3 He and 4 He targets is considered at beam energies below 300 MeV within the Glauber-Sitenko approach, utilizing theNN amplitudes of the Jülich model as input. A good agreement with available data on differentialp 4 He cross sections and onp 3 He andp 4 He reaction cross sections is obtained. Predictions for polarized totalp 3 He cross sections are presented, calculated within the single-scattering approximation and including Coulomb-nuclear interference effects. The kinetics of the polarization buildup is discussed.

Spin dependence of the pbar-d and pbar-3He interactions

“…In the next step we use the modified formalism to calculate observables for pd elastic scattering. Earlier studies of the antiproton elastic scattering [18] and also our own previous calculations [8,13] were all done within the spinless approximation for the elementary pN amplitude M pN , i.e. keeping only A N from Eq.…”

“…The total cross sections σ i (i = 0, 1, 2, 3) are calculated using the generalized optical theorem as described in Refs. [8,13].…”

“…The spin dependence of the elementary pN amplitudes was taken into account only in collinear kinematics using the N N interaction model of the Jülich group [9,10,11,12] and total spin-dependent cross sections were calculated for energies in the region 50-300 MeV using the generalized optical theorem. A very similar analysis was performed by us for p 3 He elastic scattering and the corresponding total cross sections were calculated [13]. However, spin observables for elastic scattering of antiprotons on light nuclei and shadowing effects (double scattering) in polarized total cross sections were not considered in those works.…”

Soft rescattering in the timelike proton form factor within a spacetime scheme

“…Interactions between a nucleon and an antinucleon are by themselves an important subject of nuclear physics. In particular data on thep-nucleon andp−nucleus annihilation process at low energies (see [44][45][46][47][48][49][50][51][52][53][54][55][56][57]) and on antiprotonic nuclei [58], as well as related theoretical analyses [47,[59][60][61][62][63][64] show that:…”

Toward polarized antiprotons: machine development for spin-filtering experiments at COSY

“…Polarizing antiprotons produced by spin filtering using the spin-dependent part of the nucleon-nucleon interaction remains the only viable, experimentally confirmed method [6,7] to polarize a stored beam of protons. For beams of antiprotons, the theoretical considerations have meanwhile been extended frompp interactions [23,24] tō pd [25] andp 3 He [26].…”