The momentum and angular distributions of punchthrough muons have been measured after a 10 λ calorimeter using an iron toroid magnet with 1.5 T as spectrometer. The calorimeter was inside a variable magnetic field of 0 to 3 T. The incident momentum of the π− beam ranged from 20 to 300 GeV/c. Measurements were also done at some beam momenta for π+, K+ and p. The results are compared with Monte Carlo predictions. A parameterization for the momentum spectrum of punchthrough muons was derived from the data.

The total punchthrough probability of showers produced by negative pions, positive pions, positive kaons and protons, has been measured as a function of depth in an absorber in a magnetic field ranging from 0 to 3 Tesla.The incident particle momentum varied from 10 to 300 GeV/c.The lateral shower development and particle multiplicity at several absorber depths have been determined.The measurements are compared with the predictions of Monte Carlo simulation programs.

The experiments at the planned 14 TeV proton-proton collider LHC will need a good identification and measurement of muons with energies of up to about 800 GeV. The production of electromagnetic secondaries by muons of energy from 10 to 300 GeV has been measured at the RD5 experiment at CERN using various detector types proposed for LHC experiments. It is demonstrated that the detectors can recognize the presence of individual hits from em secondaries, and that the muon measurement would be seriously compromised if these hits are not suppressed.

We report the results from a year long study aimed at radiation resistance and optical performance of scintillator tile with green wave shifter fiber readout. A careful investigation of several rad-hard plastic scintillators from Bicron and Kuraray, studies indicate that for a specific rad-hard Bicron scintillator, it is possible to build a tile/fiber EM calorimeter that can operate in the design luminosity of SSC. This calorimeter with excellent optical response would only have a light loss of about 5% after being exposed to 1 Mrad.

Coincidence analyzing-power measurements or asymmetries {ital A}{sub {ital x}}{sup coinc}, {ital A}{sub {ital y}}{sup coinc}, and {ital A}{sub {ital z}}{sup coinc} are presented for the {sup 12}C({ital {rvec p}},{ital p}{prime}{gamma}){sup 12}C{sup *} (15.11 MeV) reaction. A polarized proton beam at 318 MeV was used and data were obtained for three mutually perpendicular directions of polarization. A scintillator hodoscope was used for detecting scattered protons and four BGO detectors for the 15.11-MeV {gamma} rays. Data are presented for eight azimuthal directions of the scattered protons around the beam direction, and for the polar angles averaged between 3.3{degree} and 11.2{degree}. The data are compared with both nonrelativistic and relativistic calculations. The average size of the asymmetries measured is somewhat less than both predictions and the results do not agree clearly with either prediction.

Coincidence analyzing-power measurements or asymmetries A(x)coinc, A(y)coinc, and A(z)coinc are presented for the C-12(p over arrow pointing right, p'gamma)C-12(*) 15.11 MeV) reaction. A polarized proton beam at 318 MeV was used and data were obtained for three mutually perpendicular directions of polarization. A scintillator hodoscope was used for detecting scattered protons and four BGO detectors for the 15.11-MeV gamma-rays. Data are presented for eight azimuthal directions of the scattered protons around the beam direction, and for the polar angles averaged between 3.3-degrees and 11.2-degrees. The data are compared with both nonrelativistic and relativistic calculations. The average size of the asymmetries measured is somewhat less than both predictions and the results do not agree clearly with either prediction.

Inclusive differential cross section and analyzing power ${T}_{20}$ in A(d,p)X at 2.1 GeV and for protons at 0\ifmmode^\circ\else\textdegree\fi{} are presented for the targets $^{1}\mathrm{H}$, $^{4}\mathrm{He}$, $^{12}\mathrm{C}$, Ti, and Sn. In addition, data for $^{1}\mathrm{H}$ at 1.25 GeV are also shown. For all targets the cross-section data show a similarity in shape when plotted as a function of q, the proton momentum in the deuteron frame, each target exhibiting a shoulder near q=0.30--0.35 GeV/c. Likewise, ${T}_{20}$ values are largely independent of the target's A value. When compared with higher-energy data for $^{12}(\mathit{d}$,p)X, the new results establish the universality of the shoulder over the energy range 1.25--7.4 GeV, as well as the energy independence of ${T}_{20}$. The $^{1}(\mathit{d}$,p)X data are compared with the results of a nonrelativistic calculation of the six lowest-order graphs of the process using elastic, on-shell NN amplitudes and the Paris NN potential deuteron wave function. The calculated cross sections have no shoulder at either of the two energies of this experiment; the observed behavior of ${T}_{20}$ is reproduced qualitatively only. Comparisons with $^{2}(\mathit{p}$,2p) and $^{2}(\mathit{e}$,e'p) data are made and various possible origins for the anomalous shoulder discussed, including \ensuremath{\pi} rescattering, \ensuremath{\Delta} excitation, and a six quark component in the deuteron.

This paper describes an experiment designed to search for a new form of nuclear matter—a bound η‐nucleus system. The (π+,p) reaction was used to study the possible formation of an η‐mesic nucleus. No narrow η‐nuclear bound states were observed using Li, 12C, 16O and 27Al targets. The results of this experiment have now been published elsewhere by Chrien et al.

Cross sections and ${T}_{20}$ analyzing powers for $\mathrm{dA}\ensuremath{\rightarrow}\mathrm{pX}$ are presented. A shoulder in the cross section previously reported at higher energies and for carbon is observed for H, C, and Ti at the same $d$-c.m.-frame proton momentum, $q=0.35$ GeV/c. At $q<0.2$ GeV/c both cross-section and ${T}_{20}$ data depend only weakly upon the target atomic number $A$. Calculations in the plane-wave impulse approximation with several $\mathrm{NN}$ wave functions, and with either a $\ensuremath{\Delta}\ensuremath{\Delta}$ or a six-quark component added, are discussed.