The negative-pion multiplicity is measured for central collisions of 40 Ar with KC1 at eight energies from 0.36 to 1.8 GeV/nucleon and for 4 He on KC1 and 40 Ar on Bal 2 at 977 and 772 MeV/nucleon, respectively. A systematic discrepancy with a cascade-model calculation which fits proton-and pion-nucleus cross sections but omits potential-energy effects is used to derive the energy going into bulk compression of the system. A value of the incompressibility constant of if =240 MeV is extracted in a parabolic form of the nuclear-matter equation of state.

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Experimental results are presented on the charge, velocity, and angular distributions of intermediate mass fragments (IMFs) for the reaction Fe+Au at bombarding energies of 50 and 100 MeV/nucleon.Results are compared to the quantum molecular dynamics (QMD) model and a modified QMD which includes a Pauli potential and follows the subsequent statistical decay of excited reaction products. The more complete model gives a good representation of the data and suggests that the major source of IMFs at large angles is due to multifragmentation of the target residue.PACS number(s): 25.70.Mn

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Evaporation residues ͑ER͒ of Zϭ34 -43 are measured in singles and in coincidence with emitted protons, deuterons, tritons, and alpha particles. Measurements are done with a large detector array that covers the scattering angles from 2.5°to 25°. The energy centroids of the coincidence spectra of the protons are reasonably well described by statistical model calculations assuming complete fusion, although those for the deuterons and tritons are not. The ␣-particle spectra are significantly different than the calculated ones. The slopes of the high energy spectra of the protons required a level density parameter aϾA/12. Comparisons between the experimental ER singles spectra and complete fusion calculations show small deviations that can be explained by incomplete fusion however, when analyzed in coincidence with light particles a very good description with complete fusion is found especially if the emission of intermediate mass fragments is included in the calculations.

A phoswich array consisting of 48 ..6.E-E elements with sufficient granularity (..6.9 = ±2.5 o) to handle high multiplicity events has been built and used in several experiments. The full angular coverage is a 35 o x 35 o square cross section of the 47r sphere. Unit charge resolution for Z < 10 and mass resolution for Z=l particles has been achieved with a ± 5% energy resolution.Experimental details and the performance of the array are presented and discussed.t

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