This paper describes a computer code, RYLLA, which models the deposition of x-rays into thin metal slabs, and transports the resulting photoelectrons, finding the distribution of electrons leaving the slab from both the front and back surfaces. The slab must be homogeneous, but can contain a mixture of up to 5 different elements. Due to the short electron mean free path at low electron energies, RYLLA should be used only for studying thin slabs, roughly < 100 mg/cm/sup 2/ for low Z metals, and < 10 mg/cm/sup 2/ for high Z metals. X-ray energies should be in the range of 1 to 150 keV, as they are deposited only via photoionization and Compton scattering processes. Following photoionization, a hole exists in the electron cloud of the absorbing atom. This fills either by Auger or fluoresence, resulting in lower energy holes which are also filled. Fluoresence photons are transported and absorbed in the same manner as the primary photons, except that they are isotropically produced. Once all photons have been transported and absorbed, and all holes have been filled, a space- and energy-dependent electron source spectrum has been obtained. This is used in a discrete ordinate expansion solution of the 1-D …

The UA1 and UA2 experiments at the CERN SPS anti pp collider observed several events which they have interpreted to be the leptonic decay of the charged intermediate vector boson, W/sup +-/ + e/sup +-/nu. All of these events have an electron with large transverse momentum and large mission transverse energy. The experiments had remarkably little background in the region of large transverse momentum of the electron (P/sub Te/). In this report we examine the possibility of doing a high statistics experiment producing several million W's per year. Large statistics are necessary to obtain a precise measurement of the W/sup +/ mass and of the Z/sup 0/-W mass difference. We use the Jacobian peak in the electron P/sub T/ distribution to obtain the W/sup +/mass. We examine in detail the P/sub T/ distribution of the electron produced by the leptonic decay of the W/sup +/ ..-->.. e/sup +/nu. We investigate backgrounds to this reaction from the pileup of minimum bias events, from leading ..pi../sup 0/s in light quark jets simulating electrons and from the decay of heavy quark jets producing electrons.

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Abstract: Procedures are presented in detail of two methods for the determination of very small percentages or uranium (down to 0.0025). The methods are applicable to a wide variety of materials. Notes on the methods and confirmatory experiments are also given.

The following report is the fourth in a series of reports on rare and uncommon elements prepared by the Geological Survey. This report covers columbius and tantalus, two chemical elements belonging to the fifth group of the periodic table and quinquevalent in most of their compounds.

Following construction and prior to commissioning a compressor system, it is necessary to test the piping, fill the purification vessels with adsorbents and remove all contaminants. The technical papers incoprorated in this report give detailed procedures for those tasks. (GHT)

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