Results are presented for a measurement for the production of the antihydrogen atom , the simplest atomic bound state of antimatter. A method has been used by the PS210 collaboration at LEAR which assumes that the production of is predominantly mediated by the e+e−-pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral atoms are identified by a unique sequence of characteristics. In principle is well suited for investigations of fundamental CPT violation studies under different forces, however, in our investigations we concentrate on the production of this antimatter object, since so far it has never been observed before. The production of 11 antihydrogen atoms is reported including possibly 2±1 background signals, the observed yield agrees with theoretical predictions

We have developed a new type of nonevaporable getter (NEG) pump. It is based on the getter strip St707, produced by SAES getters S.p.A, fitted into a CF-flanged container. The pump is activated at 400°C for 1 h and its pumping behavior is studied for H2, CO, and N2. The pumping speed is about 500 liters/s for H2, 230 liters/ for CO, and 130 liters/s for N2, which is in good agreement with our theoretical pumping model. While its performance is similar to those of commercial NEG pumps, it is definitely more compact, inexpensive, and easy to use. When coupled with single-penning cell, our NEG pump can replace conventional ion pumps in the design of compact ultrahigh vacuum (UHV) systems. Its first application will be as an efficient and compact pumping device for portable UHV enclosure.

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The pp→K S K S →4 Ϯ cross section was measured at incident antiproton momenta between 0.6 and 1.9GeV/c using the CERN Low Energy Antiproton Ring. This investigation was part of a systematic study of in-flight antiproton-proton annihilations into two-neutral-meson final states in a search for hadronic resonances. A coarse scan of the pp→K S K S cross section as a function of center-of-mass energy between 1.964 and 2.395 GeV/c 2 and a fine scan of the region surrounding the ͑2220͒ are presented. Upper limits on the product branching ratio B(→ pp)ϫB(→K S K S ) are determined for a wide range of mass and width assumptions based on the nonobservation of the ͑2220͒. A rise in the pp→K S K S cross section is observed near 2.15 GeV/ c 2 , which is consistent with the f 2 (2150) resonance. ͓S0556-2821͑97͒06919-1͔