On the focusing in neutron diffraction by elastically bent perfect crystals

Following the interest in employing elastically-bent crystals as neutron monochromators, analyzers or neutron optical elements for SANS studies or residual stress measurements we present real and momentum space treatment of focusing for any curvature, reflection and transmission geometries and an ideally-collimated incident beam as well as a slit source of polychromatic neutrons. On the basis of this treatment one may set the optimum parameters concerning the experimental setting in order to obtain a maximum possible gain in resolution versus intensity with respect to the investigated sample. (orig.)Available from TIB Hannover: RO 8345(17) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Flow effects in Bi + Pb collisions at 1 GeV/u

We report particle-exclusive measurements of triple-differential cross sections for positive pions, nucleons and light nuclear fragments in multiplicity-selected collisions of 1 GeV/u "2"0"9Bi+"2"0"8Pb. The dependence upon the azimuthal angle with respect to the reaction plane is studied as a function of the particle rapidity and transverse momentum. Flow and squeeze-out are clearly established. For the baryonic component both effects increase with increasing mass of the particle. The meson flow is anticorrelated to the baryon flow. (orig.)Available from TIB Hannover: RO 801(93-75) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Pion reabsorption in heavy-ion collisions interpreted in terms of the #DELTA# capture process

We have measured energy-differential cross sections for #pi#"0 production in "3"6Ar+"1"9"7Au collisions at 95 MeV/u. From an analysis of spectral features due to pion final-state interactions we have estimated the cross section of the capture process #DELTA#+N#->#N+N in the center-of-mass energy range #sq root#s#approx =#2.05-2.25 GeV. Within the frame of BUU calculations, our results support the extension of the detailed-balance principle to broad-width resonances. (orig.)23 refs.SIGLEAvailable from TIB Hannover: RO 801(95-67) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Investigation of polar and azimuthal distributions of subthreshold pions at intermediate energies

SIGLEAvailable from TIB Hannover: RO 801(94-20) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Evidence for stopping in heavy-ion collisions from a study of hard-photon source velocities

SIGLEAvailable from TIB Hannover: RO 801(94-19) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman