[en] We review the efforts of the Notre Dame non accelerator high energy physics group. Our major effort has been directed toward the IMB deep underground detector. Since the departure of the Michigan group our responsibilities to the group have grown. We are also very active in pursuing physics with the IMB 3 detector. Currently we are studying proton decay, point neutrino sources and neutrino oscillations with the contained event sample

[en] This report discusses: Proton Decay; Point Source Search; Underground Muons from Cygnus X3; Dark Matter; Neutrino Oscillations; The Future of IMB; and Meson Spectroscopy

[en] A high resolution large mass detector has recently been proposed for the next generation of counter neutrino experiments. The concept and details of an electronic imaging chamber employing liquid argon have been put forward. Such a detector measures the time of arrival and pulse size of the electron cloud produced by ionizing tracks in argon, at an (x,y) array on the wall of the chamber. The time and (x,y) coordinates are used to reconstruct the image of the track. The pulse size can be used for particle identification. The liquid argon time projection chamber could conceivably give spatial resolutions on the order of millimeters over drift distances of 0.5 meters or more. Crucial to the implementation of these ideas is the behavior of electrons drifting large distances in the liquid. While argon itself should not present any problems, small amounts of impurities (< 50 ppb 0₂) could cause significant attenuation of the signal. Using a small laboratory set up and widely available technology the authors have studied some of the relevant properties of liquid argon. The data are in fairly good agreement with other research on the subject

[en] A number of questions regarding the flux of atmospheric neutrinos are raised. Attempts are made to understand the deficiency of muon neutrinos reported by Kamioka. These reports are not confirmed by IMB or Frejus. Questions of detection efficiency, misidentification and muon capture are exploded. Conclusions that the observed deficiency is due to muon neutrino oscillations are premature given the uncertaintly in expected flux and detector performance. (orig.)

[en] Studies of neutrino oscillations using the natural atmospheric source of neutrinos are reviewed. Studies that search for global deficiencies in the observed event rates are compared with studies based on the variation of the energy spectrum for different propagation distances. Results from both the intermediate energy contained event samples and the high energy event upward muon samples are examined. Questions about the reliability and limitations of the results are discussed. (orig.)

[en] We report on a sensitive search for neutrino oscillation. A pure nu_μ beam of low energy was constructed at the Brookhaven AGS. The appearance of any nu_e in the beam would signify oscillations. To maximize sensitivity the energy of the neutrino beam was reduced to 150 MeV. The existing neutrino beam line and a 30T liquid scintillation calorimeter used in previous nu p scattering experiments were utilized

[en] A system for fast shaving extraction at 1.5 GeV/c is implemented to extract the circulating beam in five turns. A numerical simulation is first carried out to determine the emittance and the rf structure of the extracted beam. This is followed by several machine study sessions which establish the optimal extraction configuration, confirm the emittance, and modify the transport line for low energy beam. Finally, a one-week run for the Neutrino Oscillation experiment demonstrates that the system is very stable and capable of delivering 7.5 x 10¹² p/sec with 70% extraction efficiency and 95% transport efficiency

[en] A sensitive search for neutrino oscillations is reported. A pure ν/sub μ/ beam of low energy was constructed at the Brookhaven AGS. The appearance of any ν/sub e/ in the beam would signify oscillations. To maximize sensitivity the energy of the neutrino beam was reduced to 150 MeV. The existing neutrino beam line and a 30T liquid scintillation calorimeter used in previous νp scattering experiments were utilized

[en] This chapter reports on a sensitive search for neutrino oscillations. To maximize sensitivity, the energy of the neutrino beam was reduced to 150 MeV. Calculates the expected event rate for pion production in the target, horn focusing, and neutrino interactions in the detector. Examines the fine time structure of the beam events with respect to the RF timing of the beam

[en] The decay of ¹⁵⁸Tb may be a sensitive neutrino balance which could yield the electron neutrino's mass to within a few eV. The determination of the neutrino's mass will require a knowledge of the energy levels in ¹⁵⁸Gd and so we present new high precision measurements of the energies of the γ rays from the deexcitation of these levels. They are 780.166 +- 0.007, 897.620 +- 0.055, 944.181 +- 0.009, 962.125 +- 0.009, 977.070 +- 0.170, 1107.635 +- 0.009, and 1187.147 +- 0.007. We also discuss the use of this neutrino balance and we review the current literature regarding the decay of ¹⁵⁸Tb