Now showing items 61-80 of 4524

    • Gamma-gamma directional correlations for transitions in /sup 84/kr 

      Saxena, Rajendra Narain; Jahnel, Lucia C.; Zawislak, Fernando Claudio (1980) [Journal article]
      The directional correlation of coincident 'Y transitions in 84Kr have been measured following the decay of 32 min 84Br using a Ge(Li)-Nai(TI) spectrometer. Measurements have been carried out for ten gamma cascades, resulting ...
    • Saturation of the massive Schwinger model 

      Girotti, Horacio Oscar (1980) [Journal article]
      We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ...
    • Effective polarization in quasi-free scattering 

      Maris, Theodor August Johannes; Teodoro, Maria Ribeiro; Veit, Eliane Angela (1980) [Journal article]
      A simple relation, involving only experimental quantmes, for the effective polarizations m quasi-free (p, 2p) scattering on closed shell nuclei IS tested for recent TRIUMF (p, 2p) experiments with 200 MeV polanzed protons.
    • Accuracy of the maximum entropy method 

      Strauss, Federico Maximo (1980) [Journal article]
      Although the maximum entropy method is capable of giving the period of a pure sine wave with very few data points, it is very sensitive to noise. The half power width of a spectral peak obtained by this method is proportional ...
    • Some matrix elements for morse oscillators 

      Gallas, Jason Alfredo Carlson (1980) [Journal article]
      In this paper general working equations for the Morse (r-r,)' rnatrix elements are given. These equations can be used to calculate the diagonal (m = n ) matrix elements and, for the off-diagonal (m≠n) elements, are simpler ...
    • Electric field gradients and impurity distributions in doped noble metals : a systematic study 

      Baumvol, Israel Jacob Rabin; Behar, Moni; Jornada, Joao Alziro Herz da; Livi, Rogerio Pohlmann; Lodge, Kenneth William; Zawislak, Fernando Claudio; Lopez Garcia, A. (1980) [Journal article]
      The electric field gradients created at 111Cd nuclei by dilute transition-element impurities in noble metais are studied by the technique of time-differential perturbed angular correlation. The present results supplement ...
    • Uniqueness of the functional approach 

      Girotti, Horacio Oscar; Simoes, Tiago Josue Martins (1980) [Journal article]
      It is shown that the phase-space Schwinger equations can only be appropriately formulated in terms of a specific discrete procedure. Nevertheless, the solutions to Schwinger equations turn out to be independent of the ...
    • Investigation of nuclear structure by quasi-free scattering with polarized protons 

      Fernandez, Francisco; Maris, Theodor August Johannes; Schneider, Claudio; Vasconcellos, Cesar Augusto Zen (1981) [Journal article]
      Quasi-free scattering with polarized protons can be a sensitive method to probe certain spin correlations in the nuclear wave function. This is demonstrated by the comparison of the effective polarizations following from ...
    • Study of the nuclei of NGC 3732 and IC 4662 

      Pastoriza, Miriani Griselda; Dottori, Horacio Alberto (1981) [Journal article]
      The nuclei of two galaxies which show intense [O III] emission lines, NGC 3732, an Sa, and IC 4662, an irregular with a very bright nucleus, are analyzed spectroscopically. The physical condition of the emitting gas and ...
    • Coherent and incoherent radiation from free-electron lasers with an axial guide field 

      Freund, Henry P.; Sprangle, P.; Dillenburg, Darcy; Jornada, Eda Homrich da; Liberman, Bernardo; Schneider, Ruth de Souza (1981) [Journal article]
      The spontaneous and induced emission from a free-electron laser is treated for the case in which an axial magnetic field is imposed in addition to the helical, axially periodic wiggler magnetic field. The classes of possible ...
    • Measurements of the equivalent width of the h/sub beta/ emission line and age determination of hii regions of the lmc and smc 

      Dottori, Horacio Alberto; Bica, Eduardo Luiz Damiani (1981) [Journal article]
      The equivalent width of the emission line Hβ was measured photoelectrically in 29 H II regions of the LMC and 2 of the SMC respectively. The age of these regions was obtained through a calibration of Wʜβ. A relation was ...
    • Threshold shifting of nmos transitions by arsenic ion implantation prior to gate oxidation 

      Souza, Joel Pereira de; Charry, E. (1981) [Journal article]
      This paper reports on the threshold adjustment of NMOS transistors by arsenic ion implantation in the channel region directly into bare silicon just before the gate oxidation. Experimental results showed very good uniformity ...
    • The influence of tin implantation on the oxidation of iron 

      Baumvol, Israel Jacob Rabin (1981) [Journal article]
      The high-temperature oxidation of metallic iron implanted with Sn ions at doses between 5 X 10 15 and 5 X 10 16 Sn ions cm-² is studied in the temperature range from 300 to 500 °c. Ion implantation of Sn reduces the oxidation ...
    • Detrapping of vacancies at in/sup 111/ in quenched silver 

      Arias, C. Alonso; Behar, Moni; Filevich, A.; García Bermúdez, Gerardo Jose; Savino, E.J.; Livi, Rogerio Pohlmann; Zawislak, Fernando Claudio (1981) [Journal article]
      The isothermal recovery of a quenched Ag foil doped with 111 ln has been studied through the time-differential perturbed-angular-correlation technique. A nearest-neighbor-vacancy configuration has produced a quadrupole ...
    • Quantization of gauge-invariant theories through the dirac-bracket formalism 

      Costa, Mario Eduardo Vieira da; Girotti, Horacio Oscar (1981) [Journal article]
      A physical system possessing first-class constraints is quantized by using the Dirac-bracket formalism. The main features of this quantization procedure are analyzed. The model enables us to present a situation where ...
    • Electrical Resistance and Crystallization Characteristics of Fe/Sub 80/B/Sub 20/a 

      Baibich, Mario Norberto; Muir, W.B.; Van Wyck, D.R. (1981) [Journal article]
      The electrical resistance of amorphous Fe80B20 has been measured as a function of time at various temperatures during an isothermal crystallization process. The results fit a universal curve when ∆R/∆R1 is plotted against ...
    • Anisotropic rare-earth spin-glasses 

      Fert, Albert R.; Pureur Neto, Paulo; Hippert, F.; Baberschke, Klaus; Bruss, F. (1982) [Journal article]
      We present magnetic measurements (ac and de susceptibilities and magnetization) on YEr and YGd single crystals. The longitudinal (i.e., along the c axis) susceptibility of YEr shows a typical spin-glass-like cusp, whereas ...
    • Iron nitride and carbonitride phases in a nitrogen implanted carbon steel 

      Santos, Carlos Alberto dos; Barros Junior, Bernardo A.S. de; Souza, Joel Pereira de; Baumvol, Israel Jacob Rabin (1982) [Journal article]
      Iron nitride and carbonitride phases formed during nitrogen implantation and subsequent thermal annealing of a medium-carbon steel are investigated by means of conversion electron Mossbauer scattering. The results are ...
    • Hamiltonian formulation of QED in the superaxial gauge 

      Girotti, Horacio Oscar; Rothe, Heinz J. (1982) [Journal article]
      We present a hamlltonian formulation of QED in a fully fixed axial gauge. The equal-time commutators for all field variables are computed and are shown to lead to the correct equations of motion. The constraints and gauge ...
    • Thermopower and resistivity in amorphous Mg/sub 1-x/Zn/sub x/ alloys 

      Baibich, Mario Norberto; Muir, W.B.; Altounian, Z.; Guo-Hua, Tu (1982) [Journal article]
      Thermopower and resistivity have been measured on a series of Mg1-xZnx amorphous alloys (0.2<X<0.35) over the temperature range 4-300 K. The thermopower data cannot be explained on the basis of the simple Ziman model. Using ...