6142351
Tensor polarization in pion-deuteron elastic scattering.
Angular distributions of the deuteron tensor polarization, t/sub 20/, in ..pi..-d elastic scattering have been measured at pion energies of 180, 220, and 256 MeV. The experiment and analysis are described in detail. Theoretical calculations in which the effects of pion absorption on the elastic channel are small seem to reproduce the data. An excitation function was measured in order to search for a rap- id energy dependence of t/sub 20/. No rapid angular or energy dependence was found near a pion energy of 134 MeV, where other experiments have suggested the existence of dibaryon resonances.
125153655
Status Report: Technical Design of Neutrino Beams for the Main Injector (NuMI)
120513947
A study of the transport of high energy muons through a soil shield at the tevatron
Abstract The transport of high energy muons in a soil shield was studied by making fluence distribution measurements at three different locations following a 600 m thick earth shield. The incident muon beam had a broad momentum spectrum with a mean of about 500 GeV/ c . The results are compared with Monte Carlo calculations of muon transport. Agreement between calculations and measurements is generally excellent when the muon beam was incident directly on the earth shield. In another series of measurements, the muons were magnetically deflected downward before impinging on the shield. This greatly reduced the muon fluence at distant locations and somewhat worsened the agreement between the model calculations and the observations, most likely by increasing the relative importance of sources of muons not included in the model. Still, peak values in muon fluence distributions are adequately described by the calculations.
116331841
Measurement of neutron spectra and doses in the Tevatron tunnel for 800 GeV circulating proton beams
Measurements of the neutron fluence and energy spectrum were made in the Fermilab tunnel during Tevatron operation, using Bonner spheres and other instruments operated under various gated conditions. With a coasting beam of 10{sup 11} protons at 800 GeV, the average fluence rate at 2 m from the beam line was 3.6 cm{sup {minus}2} sec{sup {minus}1}. Comparison was made between spectra from the unfolding codes BUNKI, LOUHI and SWIFT, and reasonable agreement was found. There were no significant qualitative differences between spectra determined for Tevatron coasting beam conditions at 800 or 150 GeV or for Main Ring acceleration to 120--150 GeV at our location. When the unfolded spectra are plotted in lethargy units, in addition to the usual slowing-down component and thermal peak, a prominent peak is evident at about 0.23 MeV. About 30% of the fluence is contained between 100 keV and 1 MeV, and there is a surprising paucity of high-energy neutrons ({approx} 4% above 10 MeV). The median energy for the unfolded spectra is about 0.06 MeV and the average quality factor is close to 7.0. Values for the average neutron kerma factor in tissue and silicon are determined and upper limits are given for absorbed dosesmore » due to photons and minimum-ionizing particles. 32 refs., 18 figs.« less
121029159
A study of the production and transport of muons through shielding at the Tevatron
Abstract The fluence distributions of muons were measured at a number of locations downstream of three different target stations in the fixed-target experimental areas of the Fermilab Tevatron. These were compared with Monte-Carlo calculations of muon production by 800 GeV protons and their transport through shielding materials and regions of magnetic fields. Agreement between the measured and calculated fluence is quite satisfactory at distances between 167 and 3000 m from the primary production targets. The calculations are therefore a trustworthy tool for predicting muon fluence distributions.
118149232
A guide to understanding the radiation environment of the Superconducting Super Collider (SSC)
116581947
SUPERSYMMETRY IN COMPACTIFICATIONS OF THE HETEROTIC STRING