M. A. Faessler

Hypernuclear production in the

Abstract Cross sections for the production of hypernuclei were measured in the reaction A(K − , π − ) Λ A. on light and heavy nuclear targets, using a separated K − beam at the CERN Proton Synchrotron. The pions were detected in the forward direction. The results are compared with cross sections calculated under the assumption that the reaction took place on a single neutron. The good agreement between the measured and the calculated cross sections justifies the use of the (K − , π − ) reaction in order to obtain spectroscopic information on hypernuclei.

(K^−, π^−)

Momenta of charged particles produced in inelastic αα, αp, andpp collisions were measured using the Split-Field-Magnet detector at the CERN Intersecting Storage Rings. Inclusive and semi-in-clusive spectra are presented as a function of rapidityy, Feynman-x, and transverse momentumpT. The inclusivey distributions agree well with predictions of the dual parton model; the highest particle densities are reached aty≃0 and the momenta of leading protons decrease significantly for increasing total multiplicity. ‘Temperatures’ are equal in αα, αp, andpp interactions. ThepT distributions depend weakly on the multiplicity.

reaction

Many-particle rapidity correlations have been studied for αα,dd, andpp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types.

Charged particle spectra in αα and αp collisions at the CERN ISR

AbstractThe relative yields of kaons and protons compared with the yield of pions at highpT and polar angles θ away from 90° (in the range from 10° to 45°) are presented forpp, dd, and αα interactions at a centre-of-mass energy

Composition of particles emitted at largep T and medium angles inpp, dd, andαα collisions at the CERN intersecting storage rings

\sqrt {s_{NN} } = 31

Neutron hole states in /sup 6//sub Lambda /Li, /sup 7//sub Lambda /Li, /sup 9//sub Lambda /Be and /sup 12//sub Lambda /C hypernuclei

GeV per nucleon-nucleon collision. The measured particle ratios depend on the atomic mass numberA of the beam particles and on θ. TheA dependence of the ratios becomes stronger for largerpT and is more pronounced at smaller polar angles.

High-p T aa andap interactions

Inelasticαα anddd collisions were studied at a centre-of-mass energy √SNN=31.2 GeV per nucleon-nucleon collision, using the Split-Field Magnet (SFM) detector at the CERN ISR. In this paper we show the inclusive and semi-inclusive rapidity distributions of protons, compare them with predictions of the Lund model, and calculate the average rapidity loss for participant protons. From the negative particles we calculate the inelasticity of the interaction, the average energy per particle, and the degree of isotropy of the produced hadrons.

High- p T alphaalpha and alphap interactions

Abstract Neutron hole states in the 1s shell have been studied in the n(K−, π−)Λ strangeness-exchange reaction on 6Li, 7Li, 9Be, and 12C targets at the CERN Proton Synchrotron. The excitation energy and the width of the states as well as the differential cross section have been determined. The clear similarity with the 1s proton hole states observed in (p, 2p) reactions indicates that the presence of the Λ-particle can be taken into account within the weak-coupling model. In this way the (K−, π−) reaction can be used for the study of Λ -states as well as for the investigation of neutron hole states produced at very low momentum transfer.