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Approaches to ultrafast neutron detectors

Description: We discuss two approaches to obtain detectors of very high temporal resolution. In the first approach, uranium-coated cathode is used in a streak tube configuration. Secondary electrons accompanying the fission fragments from a neutron-uranium reaction are accelerated, focussed and energy analyzed through a pinhole and streaked. Calculations show that 20 ps time-resolution can be obtained. In the second approach, a uranium-coated cathode is integrated into a transmission line. State-of-the-art … more
Date: October 5, 1984
Creator: Wang, C. L.; Kalibjian, R.; Singh, M. S.; Wiedwald, J. D.; Campbell, D. E.; Campbell, E. M. et al.
Item Type: Refine your search to only Article
open access

Assessment of alternatives for long-term management of uranium ore residues and contaminated soils located at DOE's Niagara Falls Storage Site

Description: About 11,000 m/sup 3/ of uranium ore residues and 180,000 m/sup 3/ of wastes (mostly slightly contaminated soils) are consolidated within a diked containment area at the Niagara Falls Storage Site (NFSS) located about 30 km north of Buffalo, NY. The residues account for less than 6% of the total volume of contaminated materials but almost 99% of the radioactivty. The average /sup 226/Ra concentration in the residues is 67,000 pCi/g. Several alternatives for long-term management of the wastes an… more
Date: November 5, 1984
Creator: Merry-Libby, P.
Item Type: Refine your search to only Article
open access

Database requirements for the Advanced Test Accelerator project

Description: The database requirements for the Advanced Test Accelerator (ATA) project are outlined. ATA is a state-of-the-art electron accelerator capable of producing energetic (50 million electron volt), high current (10,000 ampere), short pulse (70 billionths of a second) beams of electrons for a wide variety of applications. Databasing is required for two applications. First, the description of the configuration of facility itself requires an extended database. Second, experimental data gathered from t… more
Date: November 5, 1984
Creator: Chambers, F.W.
Item Type: Refine your search to only Article
open access

Including the effect of control strategy in solar load ratio calculations

Description: As originally developed, solar load ratio correlations for performance analysis of passive heating systems were intended for use only with a constant thermostat setpoint. The thermostat setpoint used in the method may be adjusted to account for the effect of heating from internal sources, but setback or shutdown strategies that are frequantly employed in both residential and commercial buildings were not allowed. A procedure for approximating the effect of various control strategies through use… more
Date: June 5, 1984
Creator: Wray, W. O. & Kosiewicz, C. E.
Item Type: Refine your search to only Article
open access

Long-pulse beamlines for the mirror fusion test facility

Description: We have recently obtained test results indicating that a beam of pure full-energy deuterium particles can be delivered to the plasma targets in MFTF-B. We used a close-coupled separator magnet with the ion source to separate the impurities from the full-energy deuterium particles. Our completed studies show that the usual iron-core sweep magnet and shielding used in neutral beamlines can be eliminated and the gas flow out of the beamline decreased. This design also reduces beam losses. We will … more
Date: September 5, 1984
Creator: Stone, R.R.; Goldner, A.I. & P., Poulsen
Item Type: Refine your search to only Article
open access

Monte Carlo simulation of the microcanonical ensemble

Description: We consider simulating statistical systems with a random walk on a constant energy surface. This combines features of deterministic molecular dynamics techniques and conventional Monte Carlo simulations. For discrete systems the method can be programmed to run an order of magnitude faster than other approaches. It does not require high quality random numbers and may also be useful for nonequilibrium studies. 10 references.
Date: April 5, 1984
Creator: Creutz, M.
Item Type: Refine your search to only Article
open access

Muon SR Newsletter, No. 29, April 5, 1984

Description: Muon SR stands for Muon Spin Relaxation, Rotation, Resonance, Research, or what have you. The intention of the mnemonic acronym is to draw attention to the analogy with NMR and ESR, the range of whose applications is well known. Any study of the interactions of the muon spin by virtue of the asymmetric decay is considered ..mu..SR, but this definition is not intended to exclude any peripherally related phenomena, especially if relevant to the use of the muon's mganetic moment as a delicate prob… more
Date: April 5, 1984
Creator: Crowe, K.M.; Portis, A.M. & Yamazaki, T. (eds.)
Item Type: Refine your search to only Report
open access

Radiochemical detector cross section sensitivity studies in the A approx. = 90 mass region

Description: The use of radiochemical detectors in the A approx. = 90 mass region to measure 14 MeV neutron fluences is investigated from the standpoint of cross section sensitivities. Specifically, /sup 90/Zr and /sup 89/Y neutron-induced cascades leading to the production of /sup 89/Zr, /sup 88/Zr, /sup 88/Y, and /sup 87/Y are studied in a one-energy-group approximation, and the sensitivities of the measured ratios R/sub Z/ = /sup 88/Zr//sup 89/Zr and R/sub Y/ = /sup 87/Y//sup 88/Y to the input cross sect… more
Date: April 5, 1984
Creator: MacGregor, Malcolm H.
Item Type: Refine your search to only Report
open access

Reaction cross-section calculations using new experimental and theoretical level structure data for deformed nuclei

Description: A technique for modeling quasiparticle excitation energies and rotational parameters in odd-odd deformed nuclei has been used to construct sets of discrete states with energy 0 to 1.5 MeV in /sup 176/Lu and /sup 236/Np. These data were used as part of the input for calculation of isomer production cross-section ratios in the /sup 175/Lu(n,..gamma..)/sup 176/Lu and /sup 237/Np(n,2n)/sup 236/Np reactions. In order to achieve agreement with experiment, it has been found necessary to include in the… more
Date: October 5, 1984
Creator: Hoff, R. W.; Gardner, D. G. & Gardner, M. A.
Item Type: Refine your search to only Article
open access

Searching for top, Higgs, and supersymmetry: the minimum invariant mass technique

Description: Supersymmetric particls, Higgs mesons, the top quark and other heavy objects are expected to decay frequently into three or more body final states in which at least one particle, such a neutrino or photino, is non-interacting. A method is described for obtaining an excellent estimate of both the mass and the longitudinal momentum of the parent state. The probable longitudinal momenta of the non-interacting particle and of the parent, and the minimum invariant mass of the parent are derived from… more
Date: March 5, 1984
Creator: Berger, E. L.
Item Type: Refine your search to only Article
open access

Soft x-ray laser experiments at Novette Laser Facility

Description: We discuss the results of and future plans for experiments to study the possibility of producing an x-ray laser. The schemes we have investigated are all pumped by the Novette Laser, operated at short pulse (tau/sub L/ approx. 100 psec) and an incident wavelength of lambda /sub L/ approx. 0.53 ..mu..m. We have studied the possibility of lasing at 53.6, 68.0 to 72.0, 119.0, and 153.0 eV, using the inversion methods of resonant photo-excitation, collisional excitation, and three-body recombinatio… more
Date: March 5, 1984
Creator: Matthews, D.; Hagelstein, P.; Rosen, M.; Kauffman, R.; Lee, R.; Wang, C. et al.
Item Type: Refine your search to only Article
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