Papers by richard schectman
Modo de acesso: World Wide Web Inclui bibliografia 1. Educação 2. Gestão Escolar 3. Metodologia I... more Modo de acesso: World Wide Web Inclui bibliografia 1. Educação 2. Gestão Escolar 3. Metodologia I. Título CDD-370 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores www.poisson.com.br
Photoproduction of Pairs of Pions from Deuterium
Oscillator strengths for ultraviolet atomic transitions
A pulsed beam time of flight technique for studying ion-atom scattering
Nuclear Instruments and Methods in Physics Research, 1982
Monte Carlo calculation of the distributions of interatomic separation and relative velocity resulting from the dissociation of fast molecular ions by thin foils
Physical Review A, 1981
... cm carbon foils. (a) Single-scattering cross section of Lindhart (Meyer) —full Monte Carlo ca... more ... cm carbon foils. (a) Single-scattering cross section of Lindhart (Meyer) —full Monte Carlo calcu-lation. (b) Exponential screening Born approximation single-scattering cross section —full Monte Carlo cal-culation. (c) Coulomb ...
Nuclear Physics, 1966
The inelastic scattering of 14 MeV neutrons from natural samples of AI, Fe, Ni, Cu, Cd, Sn Pb and... more The inelastic scattering of 14 MeV neutrons from natural samples of AI, Fe, Ni, Cu, Cd, Sn Pb and Bi has been studied using the Livermore Cockcroft-Walton neutron time-offlight facility. For each sample the absolute differential cross sections, t7(0, E), were measured at laboratory angles of 60 °, 90 ° and 120 °. For the low-energy neutron spectra (1 < E n < 5 MeV), many of the features observed were qualitatively in accordance with predictions of the statistical model. Quantitive comparison, however, required extending the statistical model to describe multiple neutron emission and the agreement was not satisfactory, independent of the choice of level density parameters. E I NUCLEAR REACTIONS AI' Fe' Ni' Ca' Cd' Sn' Pb, Bi(n,n'), E=14 MeV; I measured tr(En, , 0), 1 MeV < En" < 5 MeV. Deduced level densities. Natural targets.
Comment on the decay curves of hydrogenlike atoms observed at long times following excitation
Physical Review A, 1975
Explicit calculations demonstrate that cascade repopulation effects are a possible explanation of... more Explicit calculations demonstrate that cascade repopulation effects are a possible explanation of the t -1.5 dependence in the decay of Ly-α radiation at long times after excitation observed recently by Braithwaite, Matthews, and Moore. Good agreement with all available ...
Selected Lifetime and Oscillator Strength Measurements in Si ii
The Astrophysical Journal, 1998
We have remeasured the lifetimes of the 3s24s and 3s25s 2S1/2 levels in Si II using beam foil spe... more We have remeasured the lifetimes of the 3s24s and 3s25s 2S1/2 levels in Si II using beam foil spectroscopic techniques. Measured values for the lifetimes and oscillator strengths derived from them are presented and compared with previous measurements and theoretical calculations. Agreement with recent theoretical calculations is now quite good: for 3s24s it is excellent and for 3s25s it is
Computer Physics Communications, 1984
Nature ofphysical problem Calculation of the distributions of interparticle separation and Catalo... more Nature ofphysical problem Calculation of the distributions of interparticle separation and Catalogue number: AAOZ relative energy for protons which result from the dissociation of fast H~ions traversing thin carbon foils as a function of Program obtainable from: CPC Program Library, Queen's Uni-incident ion energy and target foil thickness. Effects of Coulomb versity of Belfast, N. Ireland (see application form in this issue) explosion in a screened Coulomb field, multiple Coulomb scattering by target atoms and differential energy loss (strag-Computer: IBM 4341 Installation: University of Toledo, Toledo, gling) are included. OH 43606, USA Method of solution Operating system: CP/CMS The problem is solved by application of Monte Carlo techniques in order to account for the simultaneous occurrence of Programming language used: OS/360 Fortran IV H Extended the three processes described above. High speed storage required: 50 Kbytes Restrictions Foils must be sufficiently thin that the total change in the No. of bits in a byte: 8 energies of the incident protons is not a significant fraction of the initial value and that the final interproton separation not be Word length: half word (16 bit); full word (32 bit) so large as to be comparable with the foil thickness. With the DIMENSION statements supplied, a maximum of 500 HP eripherals used: terminal, disk ions can be followed through a foil in one run. No. of cards in combinedprogram and test deck: 907 Typical running time Depends upon the problem being treated. For the example Card punching code: EBCDIC provided, the number of foil slices, NS, is 545 and typical running times per event (one H~molecule followed through
The Use of Computer Generated Data in Experiment Design—A Student Exercise
American Journal of Physics, 1972
Physical Review A
We have measured the linear polarization of the 5016-Å, 2s 1 S-3p 1 P transition of Hei excited b... more We have measured the linear polarization of the 5016-Å, 2s 1 S-3p 1 P transition of Hei excited by a thin carbon foil perpendicular to the incident He + beam at ion energies 50-500 keV. We find that the alignment of the 3p 1 P term depends upon the beam current density within the range (2-150 μA cm-2) measured. Oscillations in the dependence of both M / I (the linear polarization fraction) upon energy and the current density variation of M / I with energy are observed. We discuss possible origins of these variations.
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Papers by richard schectman