Antinucleus–nucleus cross sections implemented in Geant4

(on behalf of the Geant4 collaboration) Production of antinuclei has been observed in nucleus-nucleus and proton-proton collisions at ac-celerators by the RHIC and LHC collaborations. Now it is under investigation. An experimental study of antinucleus production requires a knowl-edge of antinucleus interaction cross sections with matter. The cross sections are needed to estimate various experimental corrections, especially those due to particle losses which reduce the detected rate. In practice, various phenomenological approaches are applied in order to estimate the antinucleus-nucleus cross sections. The aim of our paper is to describe how these estimates were obtained using the Glauber approach, and how they were prepared for use as a part of the Geant4 toolkit [1]. The antiproton elastic scattering by deuterons was considered in the classic paper by V. Franco and R.J. Glauber [2]. O.D. Dalkarov and V.A. Kar-manov [3] have shown that elastic and inelastic (with excitation of nuclear levels) antiproton scat-tering by C, Ca, and Pb nuclei are described quite well for p ̄ kinetic energies above 46.8 MeV. Thus, it is natural to use the Glauber approach to calculate the antinucleus-nucleus cross sections. The amplitude for an elastic scattering of an antinucleus on a target nucleus is quite well known [4]. Many approximations have been pro-posed in order to simplify the calculation of the am-plitude. Most effective is a method proposed in [5], in which the amplitude is found as an average over various samples of the nucleon coordinates. This method is implemented in the DIAGEN code [5]. To run the code, the total and elastic N̄N cross sections σtot