Accession Number : ADA290215

Title :   Thickness Measurement of Ammonia Targets Used in SLAC E143 Experiment.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Garvey, David R.

PDF Url : ADA290215

Report Date : DEC 1994

Pagination or Media Count : 47

Abstract : One of the primary research tools in high energy physics is the collision of beams of particles with stationary targets. The useful information that may be extracted from such experiments is proportional to knowledge of the thickness of the target. This determines how many point constituents were available for the particles in the beam to interact with. It is possible to determine he thickness of a target with statistical errors of the order of one percent by the use of x-ray attenuation measurements. Six target samples from the Stanford Linear Accelerator Center Experiment #143, "Nucleon Spin Structure at 30GeV," were measured using this method. The targets were frozen ammonia crystals. A 40 mCurie americium 241 source was used to pass a colimated beam of known intensity x-rays through the samples. The x-ray intensity on the other side was measured by a silicon cell detector. The ammonia material was removed and the process repeated. By comparing the intensities with and without the material to the tabulated attenuation coefficients, the thickness of material is calculated. (AN)

Descriptors :   *RADIATION ATTENUATION, *PARTICLE COLLISIONS, *INELASTIC SCATTERING, EXPERIMENTAL DATA, QUANTUM THEORY, ELECTRON SCATTERING, THESES, CRYSTALS, TARGETS, X RAYS, AMMONIA, HIGH ENERGY, SILICON, SAMPLING, TABLES(DATA), PARTICLE BEAMS, NUCLEONS, RELATIVISTIC ELECTRONS, LEPTONS, SPIN RESONANCE.

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE