[en] The possibility of investigating neutrino oscillations in the proposed MACRO experiment are considered. Its sensitivity taking into account the theoretical uncertainties coming from flux calculations, geomagnetic effects and propagation through matter, and the experimental limitations

[en] The Indiana University High Energy Physics Group, Task C has been actively involved in the MACRO experiment at Gran Sasso and the SSC experiment L during the current contract year. MACRO is a large US-Italian Monopole, Astrophysics, and Cosmic Ray Observatory being built under the Gran Sasso Mountain outside of Rome. Indiana University is in charge of organizing the United States software effort. We have built a state-of-the-art two-meter spectrophotometer for the MACRO liquid scintillator. We are in charge of ERP, the Event Reconstruction Processor online trigger processor for muons and stellar collapse. We are designing an air Cerenkov array to be placed on top of the Gran Sasso. Our other activity involves participation in the SSC experiment L. As long-standing members of L we have done proposal writing and have worked on important L planning and organization matters. We are now doing development work on the L Central Tracker straw drift tubes, including gas optimization, readout, and Monte Carlos. 12 refs., 20 figs., 1 tab

[en] The authors have developed an apparatus for isotope identification of heavy-ion projectile fragments with energies from approx.330 to 600 MeV/nucleon. The detector uses a Cerenkov intensity measurement in conjunction with a measurement of magnetic rigidity to determine mass. An advantage of this technique is that it allows isotope identification of projectile fragments with higher energies than are possible for stopping type detectors. Higher fragment energies allow the use of much thicker targets and, therefore, provide higher sensitivity to rare isotopes

[en] The Indiana University Task C group is participating in the experiments GEM at the SSC and MACRO at the Gran Sasso. After an introduction to GEM in paragraph II, a detailed report is presented on the work done during the current contract period on the design of the outer region of the GEM Central Tracker. The Central Tracker Monte Carlo, which was the other significant GEM activity by the group, is included. In paragraph III is introduced MACRO and a brief status report is given. Muon Astronomy analysis done using MACRO data is also presented

[en] We are participating in the experiments GEM at the SSC and MACRO at the Gran Sasso. After introducing GEM in chapter II, we present some results from GEM work we have done during the current contract period. Other significant GEM activities by our group such as participation in the evolution of GEM (as founding fathers), GEM proposal writing, and the design of GEM electronics for the Interpolating Pad Chambers for the Central Tracker are not included in this report.In chapter III we introduce MACRO and give a brief status report. Instead of a survey of our many ongoing contributions to MACRO, we choose in this technical report to concentrate on reporting results of some MACRO data analysis headed by our group (with important contributions by our collaborators, of course). This analysis, in chapter IV, concerns Point Sources

[en] Novel detector schemes are proposed for the short-baseline neutrino experiments of next generation, aimed at exploring the large-Δm² domain of ν_μ→ν_τ oscillations in the appearance mode. These schemes emphasize good spectrometry for charged particles and for electromagnetic showers and efficient reconstruction of π⁰→γγ decays. The basic elements are a sequence of relatively thin emulsion targets, immersed in magnetic field and interspersed with electronic trackers, and a fine-grained electromagnetic calorimeter built of lead glass. These elements act as an integral whole in reconstructing the electromagnetic showers. This conceptual scheme shows good performance in identifying the τ (quasi-) two-body decays by their characteristic kinematics and in selecting the electronic decays of the τ

[en] We report the results of various tests undertaken in a program to develop a drift tube hodoscope for a cosmic ray balloon experiment intended to search for extragalactic antimatter. Included are studies of mechanical integrity, electron drift velocity, tube gain, space charge saturation effects as measured for relativistic iron nuclei, and delta ray backgrounds associated with signals from iron projectiles. Implications of the results of these studies with regard to the use of drift tubes on balloon borne experiments are discussed. It is found that a spatial resolution of sigmaproportional300 μm can be achieved over a dynamic range from Z=20 to 30 with little degradation from delta ray effects for suitably chosen tube gains and discriminator threshold settings. (orig.)

[en] We propose to construct and deploy a fine-grained detector in the Fermilab NOvA 2 GeV narrow-band neutrino beam. In this beam, the detector can make unique contributions to the measurement of quasi-elastic scattering, neutral-current elastic scattering, neutral-current π⁰ production, and enhance the NOvA measurements of electron neutrino appearance. To minimize cost and risks, the proposed detector is a copy of the SciBar detector originally built for the K2K long baseline experiment and used recently in the SciBooNE experiment.

[en] Deuterated liquid scintillator detectors (NE230), which give excellent n/γ discrimination and provide a direct measure of the neutron energy spectrum, have been used to search for 2 to 3 MeV neutrons produced in d+d cold fusion. The apparatus consisted of an electrolytic cell using high-efficiency inverted-well geometry. Several samples of annealed Pd wire and a Pd casting (up to 13 g) were studied over a period of several weeks. An upper limit of ≤10^-3 fusion (n/s g) Pd was obtained corresponding to <7x10^-24 fusion (n/s) dd pair in our samples which excludes most of the reported positive results. Several sources of spurious signals, which could closely mimic signals from fusion neutrons, were also observed

[en] We describe a prototype water Cherenkov counter which has been built and tested with relativistic cosmic ray muons. An analysis of the expected photoelectron yield is described. The predicted result of 315±31 photoelectrons is compared with the experimental result of 272±30 photoelectrons. We find that over 70% of the Cherenkov photons detected have wavelengths less than 400 nm. (orig.)