[en] Within the framework of coalescence model, the problem of antideuteron (D¯) production in some high energy nuclear collisions has here been studied with the help of a new combination of models (NCM) outlined in some detail in the text. The totality of the approach, including one useful parametrization, adopted here leads us to obtain finally some theoretical results which are modestly in agreement with the measured data on various aspects of antideuteron production in both Pb + Pb and Au + Au collisions at moderately high energies. The implications of all this are discussed at the end of the paper. (author)

[en] Experiment E858 at the Brookhaven National Laboratory Alternating Gradient Synchrotron has recently reported the detection of two antideuterons produced in 14.6A GeV/c Si+Au collisions. The data were interpreted as implying antideuteron production rates about an order of magnitude below expectations. We use an extended RQMD model to demonstrate that the antideuteron yields are readily explained in a dynamical scenario that includes collective expansion and strong antinucleon absorption

[en] Problem of annihilation of fast antideuterons in complex nuclei is analyzed semi-quantitatively in the framework of a simple probabilistic model

[en] The problem of annihilation of fast antideuterons in complex nuclei is analyzed semi-quantitatively on a simple probabilistic model. Sensitivity of the annihilation cross section to two-particle nuclear distribution is analyzed. (author)

[en] The cross-section and multiplicity distribution of the total antideuteron-deuteron annihilation are estimated assuming two independent antinucleon-nucleon annihilations with some Glauber corrections. (Z.J.)

[en] Antideuteron-deuteron interaction processes are investigated at the Ludmila device using a separated antideuteron beam and internal track-sensitive target (ITT). The evaluations performed gives the annihilation antideuteron-deuteron cross section value σsup(A)=2-4 mb, at that, the non-annihilation cross section σsup(NA)=16-18 mb. Results of deuteron and antideuteron separation are given. The ITT structUre is described. Characteristics of simultaneous sensitivity conditions in deuterium and hydrogen are given as well. Peculiarities of deuteron-antideuteron interactions are discussed

[en] The abundances of light nuclei probe the later stages of the evolution of a system formed in a relativistic heavy-ion collision. After the system has cooled and expanded, nucleons in close proximity and moving with small relative momenta coalesce to form nuclei. Light nuclei production enables the study of several topics, including the mechanism of composite particle production, freeze-out temperature, size of the interaction region, and entropy of the system. NA44 is the only relativistic heavy-ion experiment to have both deuteron and anti-deuteron results in both pA and AA collisions and the first CERN experiment to study the physics topics addressed by d and bar d production

[en] We study the effect of the quenching of antihydrogen quantum states near the surface of a material in the Earth's gravitational field by local charges randomly distributed along a mirror surface. The quenching reduces the probability of quantum reflection because of the additional atom–charge interaction, and thus the nonadiabatic transitions to excited gravitational states. Our approach is suitable when accounting for quenching caused by any kind of additional interaction with a characteristic range much smaller than the typical gravitational state wavelength. (paper)

[en] The use of a gas jet internal target in an antiproton storage ring provides a unique source of antiproton-nucleus interaction. This has made possible for the experiment PS210 to measure for the first time the formation of antihydrogen (H-bar) atoms.This contribution describes the characteristics of the target of the PS210 and E835/E862 experiments

[en] The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and the antiproton with high precision. Using single particles in a Penning trap, the proton/antiproton g-factors, i.e. the magnetic moment in units of the nuclear magneton, are determined by measuring the respective ratio of the spin-precession frequency to the cyclotron frequency. The spin precession frequency is measured by non-destructive detection of spin quantum transitions using the continuous Stern-Gerlach effect, and the cyclotron frequency is determined from the particle's motional Eigenfrequencies in the Penning trap using the invariance theorem. By application of the double Penning trap method we expect that in our measurements a fractional precision of δg/g 10"-"9 can be achieved. The successful application of this method to the antiproton will consist in a factor 1000 improvement in the fractional precision of its magnetic moment. The BASE collaboration has constructed and commissioned this new experiment at the Antiproton Decelerator (AD) of CERN. This article describes and summarizes the physical and technical aspects of this new experiment. (authors)