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in publisher: "Hahn-Meitner-Institut fuer Kernforschung Berlin G.m.b.H. Germany, F.R."  
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Analysis of inelastic neutron scattering spectra from a time-of-flight spectrometer with filter detector

Description: Inelastic neutron scattering spectra obtained from time-of-flight spectrometers with filter detector suffer in energy resolution from a long time-of-flight tail in the filter response function. A mathematical method is described which removes this tail in measured spectra. The energy resolution can thereby be adapted for each part of the spectrum. Applications of the method to data taken at the LANSCE pulsed spallation source are presented.
Date: January 1, 1986
Creator: Vorderwisch, P.; Mezei, F.; Eckert, J. & Goldstone, J.A.
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Partner: UNT Libraries Government Documents Department
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Atomic-orbital expansion model for describing ion-atom collisions at intermediate and low energies

Description: In the description of inelastic processes in ion-atom collisions at moderate energies, the semiclassical close-coupling method is well established as the standard method. Ever since the pioneering work on H/sup +/ + H in the early 60's, the standard procedure is to expand the electronic wavefunction in terms of molecular orbitals (MO) or atomic orbitals (AO) for describing collisions at, respectively, low or intermediate velocities. It has been recognized since early days that traveling orbital… more
Date: January 1, 1983
Creator: Lin, C. D. & Fritsch, W.
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Partner: UNT Libraries Government Documents Department
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Study of transfer and breakup reactions with the plastic box

Description: The study of transfer reactions with heavy-ion projectiles is complicated by the frequent presence of three or more nuclei in the final state. One prolific source of three-body reactions is the production of a primary ejectile in an excited state above a particle threshold. A subset of transfer reactions, viz., those producing ejectiles in bound states, can be identified experimentally. This has been accomplished with a 4..pi.. detector constructed of one-millimeter-thick scintillator paddles o… more
Date: December 1, 1984
Creator: Stokstad, R.G.; Albiston, C.R.; Bantel, M.; Chan, Y.; Countryman, P.J.; Gazes, S. et al.
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Partner: UNT Libraries Government Documents Department
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Effects of solutes on damage production and recovery in zirconium

Description: Dilute zirconium-based alloys and pure zirconium were irradiated at 10 K with spallation neutrons at IPNS. Four types of alloys - Zr-Ti, Zr-Sn, Zr-Dy and Zr-Au - each with three concentration levels, were used. Low-temperature resistivity damage rates are enhanced by the presence of any of the four solutes. The greatest enhancement was produced by Au while the least by Dy. Within each alloy group, damage production also increased but at a decreasing rate, with increasing concentration. Post-irr… more
Date: April 1, 1986
Creator: Zee, R. H.; Birtcher, R. C.; MacEwen, S. R. & Abromeit, C.
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Partner: UNT Libraries Government Documents Department
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Point defect production and annihilation in neutron-irradiated zirconium

Description: High-purity Zr has been irradiated to a dose of 2.2 x 10/sup 21/ n/m/sup 2/ (E < 0.1 MeV) using the pulsed spallation source at IPNS. Electrical resistivity was monitored continuously during irradiation. The saturation resistivity, found from a linear extrapolation of the damage-rate curve between four and five n..cap omega...m. However, comparison with data from the literature shows that the normalized damage-rate curves from five experiments at different temperatures (less than or equal to 77… more
Date: May 1, 1984
Creator: MacEwen, S. R.; Zee, R. H.; Birtcher, R. C. & Abromeit, C.
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Partner: UNT Libraries Government Documents Department
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Transfer ionization in 0. 5-1. 5 MeV/u O/sup 5 -8 +/ + He collisions

Description: Transfer ionization (TI), in which electron capture is accompanied by loss of the other electron from the target, been measured for 0.5 to 1.5 MeV/u 0/sup q//sup +/ ions (q = 5-8+) colliding with helium. These new measurements, in conjunction with previous measurements at lower energies, are used to formulate a scaling rule to describe the projectile energy and charge state dependences of TI for collisions involving helium targets. 10 refs., 2 figs.
Date: January 1, 1986
Creator: Tanis, J.A.; Clark, M.W.; Price, R.; Ferguson, S.M. & Olson, R.E.
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Partner: UNT Libraries Government Documents Department
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Correlated double electron capture in slow, highly charged ion-atom collisions

Description: Recent measurements of autoionization electrons produced in slow, highly charged ion-atom collisions are reviewed. Mechanisms for double electron capture into equivalent and nonequivalent configurations are analyzed by comparing the probabilities for the creation of L/sub 1/L/sub 23/X Coster Kronig electrons and L-Auger electrons. It is shown that the production of the Coster-Kronig electrons is due to electron correlation effects whose analysis leads beyond the independent-particle model. The … more
Date: January 1, 1986
Creator: Stolterfoht, N.; Havener, C.C.; Phaneuf, R.A.; Swenson, J.K.; Shafroth, S.M. & Meyer, F.W.
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Partner: UNT Libraries Government Documents Department
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An Overview of Low-Energy Ion-Atom Collisions

Description: For collisions between multiply charged ions (MCI) and atoms where the energy of the MCI is in the range of 0.1 to 30 keV/amu, it is adequate to treat the motion of the heavy particles classically. The problem is treated by a close-coupling expansion in terms of atomic or/and molecular orbitals with the role of ionization being neglected. 45 refs., 4 figs. (WRF)
Date: Summer 1986
Creator: Lin, C. D.; Fritsch, W. & Kimura, M.
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Partner: UNT Libraries Government Documents Department
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Depth of origin of sputtered atoms: Experimental and theoretical study of Cu/Ru(0001)

Description: The depth of origin of sputtered atoms is a subject of considerable interest. The surface sensitivity of analytical techniques such as Secondary Ion Mass Spectrometry (SIMS) and Surface Analysis by Resonance Ionization of Sputtered Atoms (SARISA), and the sputtering properties of strongly segregating alloy systems, are critically dependent on the sputtering depth of origin. A significant discrepancy exists between the predictions of the Sigmund theory and computer sputtering models; in general,… more
Date: January 1, 1987
Creator: Burnett, J. W.; Biersack, J. P.; Gruen, D. M.; Joergensen, B.; Krauss, A. R.; Pellin, M. J. et al.
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Partner: UNT Libraries Government Documents Department
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