Narrow Results

The dielectron yield in pp and dp reactions at a beam kinetic energy of 1.25 GeV/u has been measured using the HADES spectrometer at GSI. In proton-proton reactions the most abundant source above the π⁰ Dalitz region is expected to be Δ Dalitz decay. The obsearved large difference in dielectron production in pp and dp systems suggests that dielectron production in the dp system is dominated by a np process. In order to separate Δ Dalitz decays and np bremsstrahlung we compare the dielectron yield observed in pp with the one of dp reactions measured at the same beam energy.

Preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV obtained with HADES are presented. The np reactions were studied in dp collisions at 1.25 GeV/u using a Forward Wall hodoscope, aimed at registering spectator protons. The separation of np → ppπ^-, np → npπ⁺π^- and np → dπ⁺π^- channels is demonstrated.

Recent results concerning the production of K⁺, K^-, ø, and Λ particles in the reaction system Ar+KCl at 1.76 AGeV measured by the HADES Collaboration are presented. Transverse momentum distributions have been measured in a large fraction of the phase space. For the first time, at SIS energies, K⁺, K^- and ɸ mesons have been measured independently and the slope parameter for ø mesons could be extracted. A large set of statistics has been collected for the produced and Λ in the phase space region around mid-rapidity. The high quality of these data render them very suitable for comparisons with theoretical models.

Recent results concerning the production of K⁺, K^-, ɸ, and Λ particles in the reaction system Ar+KCl at 1.76 AGeV measured by the HADES Collaboration are presented. Transverse momentum distributions have been measured in a large fraction of the phase space. For the first time, at SIS energies, K⁺, K^- and ɸ mesons have been measured independently and the slope parameter for ɸ mesons could be extracted. A large set of statistics has been collected for the produced and Λ in the phase space region around mid-rapidity. The high quality of these data render them very suitable for comparisons with theoretical models.

On October 4th, 2010, nine countries signed the international agreement on the construction of the Facility for Antiproton and Ion Research FAIR. The new facility is going to be constructed within the next eight years adjacent to the existing accelerator complex of the GSI Helmholtz Centre for Heavy Ion Research at Darmstadt/Germany, expanding the research goals and technical possibilities substantially. Providing a broad spectrum of unprecedented fore-front research at worldwide unique accelerator and experimental facilities, FAIR will open the way for a large variety of experiments in hadron, nuclear, atomic and plasma physics as well as applied sciences which will be briefly described in this article.