Sixteen heat source assemblies have been tested in support of the SNAP 19 Pioneer Safety Test Program. Seven were subjected to simulated reentry heating in various plasma arc facilities followed by impact on earth or granite. Six assemblies were tested under abort accident conditions of overpressure, shrapnel impact, and solid and liquid propellant fires. Three capsules were hot impacted under Transit capsule impact conditions to verify comparability of test results between the two similar capsule designs, thus utilizing both Pioneer and Transit Safety Test results to support the Safety Analysis Report for Pioneer. The tests have shown the fuel is contained under all nominal accident environments with the exception of minor capsule cracks under severe impact and solid fire environments. No catastrophic capsule failures occurred in this test which would release large quantities of fuel. In no test was fuel visible to the eye following impact or fire. Breached capsules were defined as those which exhibit thoria contamination on its surface following a test, or one which exhibited visible cracks in the post test metallographic analyses.

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The history of the Actuator for the ZrH Reactor system is presented. The present design status is summarized.

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We propose to study high-energy neutrino intersections in the NAL 30 m{sup 3} bubble chamber. A slight alteration of the chamber design will allow a large-solid-angle quantameter to be placed just outside the thin (1/2 inch steel) wall of the bubble chamber. A detector, designed to identify the muon of the interaction is placed outside the vacuum tank. With this hybrid system they can reconstruct the neutrino's energy, the lepton momentum transfer squared, Q{sup 2}, the lepton energy transfer and measure many features of the final hadron state. This system detects with high efficiency over the entire range of variables and is well suited to making a detailed general survey of neutrino interactions in the neutrino energy range 15 to 80 GeV. A million-picture exposure would yield tens of thousands of neutrino interactions with circulating protons at 200 GeV. A similar number of events should be obtained with protons at 500 GeV.

We propose a systematic study of elastic and quasi-elastic scatterings of pp and {bar p}p in the forward region (|t{vert_bar} {approx}< 1.5 GeV{sup 2}) from {approx} 20 to 40 GeV/c by using the single-arm spectrometer of NAL Exp. 7 without any essential change. The physics interests in this energy region warrant a precise comparison between pp and {bar p}p as a function of s(t) for fixed t(s). Therefore it is essential to use the same experimental apparatus and analysis procedures in order to minimize possible systematic errors. The possible future experiments at Serpukhov will not be able to produce sufficient flux in the secondary {bar p} beams to answer the physics questions raised in this proposal.

We propose to measure small angle p-p scattering by using a thin foil and a hydrogen jet target to intercept a small fraction of the beam without interference with the acceleration process. The measurements are based on the detection of the slow recoil proton and will yield the energy dependence of (a) the slope of the p-p nuclear diffraction peak, (b) the real part of the nuclear scattering amplitude, (c) the diffractive excitation of isobars. The proposed technique is energy independent and will provide data over the entire energy region from 25 GeV to the highest energy achieved by NAL. Total accelerated beam intensities of 10{sup 11} to 10{sup 12} protons/pulse are quite adequate. The equipment is presently under development and could be fully operational by June 1971.

We propose here to take 50,000 pictures of the NAL 30-inch bubble chamber, filled with hydrogen and exposed to 200 GeV/c beams of negative pions. We intend to study the technical limitations of the use of a bubble chamber for such high energy interactions. At the same time we will investigate the physics contained in the pictures as much as and as soon as possible. We expect to finish the study made only by scanning in a month and to end all studies in six months after getting film. Even in the energy of 200 GeV region, interactions will be accompanied with some slow secondary particles, which will be the object of analysis most interest. However majority of interactions may have a jet like topology. We will mainly use our FSD for the analysis of this experiment and the accuracy in momentum measurement and the separation of each track in a condensed jet may be the main subjects of our technical study. In the 30-inch bubble chamber, we propose to insert a target plate and a gamma conversion plate, if the situation of the chamber will allow to do so. A short discussion for the insertion of plates will be …

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