R. Siudak

The p + p → π+ + d reaction close to threshold at COSY

Abstract Differential and total cross sections of the p + p → π+ + d reaction close to threshold were measured employing a magnetic spectrograph with track reconstruction, a very thin liquid hydrogen target and an accelerated proton beam with high phase space density. The data resolve a previous discrepancy between the n + p → π0 + d and the π+ + d → 2p reaction close to threshold indicating that isospin symmetry may be broken in the s-wave part of the cross section.

Search for η-mesic nuclei in a recoil-free transfer reaction

We have studied the reaction p+{sup 27}Al {yields} {sup 3}He+p+{pi}{sup -}+X at recoil-free kinematics. An {eta} meson possibly produced in this reaction would be thus almost at rest in the laboratory system and could therefore be bound with high probability, if nuclear {eta} states exist. The decay of such a state through the N*(1535) resonance would lead to a proton-{pi}{sup -} pair emitted in opposite directions. For these conditions we find some indication of such a bound state. An upper limit of {approx_equal}0.5 nb is found.

Simultaneous measurements of the p+d→(A=3)+π reactions

A stack of annular detectors made of high purity germanium was used to measure simultaneously

Magnetic spectrometer Big Karl for studies of meson production reactions

pd\to {^3H} \pi^+

Cross section and tensor analysing power of the dd→ηα reaction near threshold

and

Energy dependence of the 8Be + 13C interaction

pd\to {^3He} \pi^0

Study of the Λp interaction close to the Σ+n and Σ0p thresholds

differential cross sections at beam momenta of 750 MeV/c, 800 MeV/c, and 850 MeV/c over a large angular range. The extracted total cross sections for the

The 11B+12C elastic and inelastic scattering at Elab(11B)=49 MeV and energy dependence of the 11B+12C interaction

pd\to {^3He} \pi^0

Energy dependence of the nucleus–nucleus interaction in the 9Be + 12C system and the 9Be reorientation

reactions bridge a gap between near threshold data and those in the resonance region. The ratio of the cross sections for the two reaction channels taken at the same

Mechanism of large angle enhancement of the 9Be+11B scattering

\eta={p^{cm}_\pi}/m_\pi