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  • 1
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    The DIRC detector at BaBar (1999)
    Elsevier
    Details
    Publication Date: 1999-08-01
    Print ISSN: 0168-9002
    Electronic ISSN: 1872-9576
    Topics: Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    MeV ion irradiation-induced creation and relaxation of mechanical stress in silica (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4723-4732 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In situ wafer curvature measurements were performed to study mechanical stress in amorphous SiO2 during Xe, Ne, and Er ion irradiation at energies in the 0.27–4.0 MeV range. Three phenomena are observed: network compaction, radiation-induced viscous flow, and a nonsaturating anisotropic deformation phenomenon. The radiation-induced viscosity is shown to be inversely proportional to the energy density deposited into atomic displacements. The relation between radiation-induced flow and diffusion is discussed in the context of the Stokes–Einstein relation. Viscous flow serves to relax stress, yet a continuous nonsaturating anisotropic deformation effect causes the stress in the irradiated layer to saturate at nonzero values: Xe irradiation at an energy below 3.6 MeV results in a tensile saturation stress; for higher energies a compressive stress builds up. These effects are explained in terms of competing bulk and surface deformation processes resulting from local heating of the SiO2 around the ion tracks. The macroscopic effect of deformation phenomena is illustrated by showing the surface morphology after 4.9 MeV Er irradiation of silica through a contact implantation mask. Finally, an in situ stress study of an alkali borosilicate glass is presented. In this case a fourth radiation induced effect is observed, namely, the generation and annihilation of volume occupying point defects. These defects are shown to anneal out at room temperature, following a broad spectrum of activation energies. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359820
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlocal potentials, isolated states, and Levinson's theorem (1999)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 40 (1999), S. 140-149 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A compact expression for the calculation of phase shifts is derived for a potential which is the sum of local and nonlocal parts. Nonlocal potentials can support positive energy bound states, that is, states embedded in the continuous energy spectrum. These states, sometimes referred to as "isolated" states, are not associated with any poles of the S matrix. Some controversy exists in the literature on how such bound states are included in Levinson's theorem; it is found that the phase shift should be taken continuous at the energy of the bound state rather than taken to have a discontinuity of π. For simplicity, the analysis is restricted to the radial s wave Schrödinger equation and separable nonlocal potentials. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.532764
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  • 4
    Electronic Resource
    Electronic Resource
    Low energy ion beam mixing as a tool for multilayer x-ray mirror fabrication (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2948-2950 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present low energy ion beam mixing as a tool for the fabrication of composite layers with smooth interfaces. Using this tool we make a stack of alternating layers of Si and MoxSiy. We measure composition and interfacial roughness (σ) and find x/y≈5/3 and σ≈4 A(ring). The method can be applied to reduce absorption losses in x-ray multilayer mirrors for high-resolution dispersive purposes, and to increase thermal stability of multilayers. The thickness of the mixed layers is found to be equal to the ion range. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116364
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  • 5
    Electronic Resource
    Electronic Resource
    Selective phonotaxis in Tettigonia cantans and T. viridissima in song recognition and discrimination (1998)
    Springer
    Journal of comparative physiology 182 (1998), S. 687-694 
    Details
    ISSN: 1432-1351
    Keywords: Key words Phonotaxis ; Pattern recognition ; Calling song ; Bushcricket Tettigonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The selectivity of female phonotaxis in Tettigonia cantans and T. viridissima was investigated on a Kramer treadmill, with respect to the specific differences in temporal pattern and spectrum of the songs of both species. In choice situations, both species preferred the conspecific song over the heterospecific one. The courses of both species were deflected by about 15–20° from the position of the conspecific song, that of T. viridissima being away from, that of T. cantans in the direction of the heterospecific song. In no-choice situations, song models with the temporal pattern of T. cantans did not attract T. viridissima. Models with the conspecific time pattern but heterospecific spectrum were as attractive as the conspecific model. In contrast, T. cantans was attracted by T. viridissima song presented alone. In choice situations, either spectral or temporal differences were sufficient for discrimination. The preference for the conspecific model gradually disappeared with stepwise reduction of its intensity and was reversed at −12 dB. Acoustic communication alone can serve species isolation in T. viridissima; however, premating isolation in T. cantans must involve other mechanisms. The orientation during the choice situations suggests a serial processing of song recognition and localization for the Tettigonia species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050213
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  • 6
    Electronic Resource
    Electronic Resource
    Filtering of temporal parameters of the calling song by cricket females of two closely related species: a behavioral analysis (1997)
    Springer
    Journal of comparative physiology 180 (1997), S. 621-630 
    Details
    ISSN: 1432-1351
    Keywords: Key words Calling song  ;  Phonotaxis  ;  Pattern recognition  ;  Cricket ; Teleogryllus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The phonotactic response of cricket females was investigated on a locomotion compensator to determine the temporal parameters of the male's calling song which are important for species recognition. Two sympatric species (Teleogryllus commodus, T. oceanicus) that show different syllable periods in the chirp and trill parts of their calling songs were used. By their responses T. commodus females exhibited two temporal filters for syllable periods, which were tuned to the species-specific syllable periods occurring during chirp and trill. For song recognition both filters had to be activated and for both a minimum number of three to five consecutive syllable periods was necessary. In contrast, T. oceanicus females showed only one sharply tuned filter corresponding to the chirp part of the male's calling song. This filter was sufficient for calling song recognition. Syllable periods of the trill part also influenced calling song recognition, but these played only a minor role. Carrier frequency was also important for positive phonotaxis. Calling song recognition by T. commodus females is largely based on central nervous processing, while for T. oceanicus both peripheral frequency filtering and central temporal filtering is important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050078
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the first-excited K π=0+ and 2+ bands in 228Th in the 226Ra(α,2n) reaction (1998)
    Springer
    The European physical journal 1 (1998), S. 39-44 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.10.Re Collective levels and giant resonances – 23.20.Lv Gamma transitions and level energies – 27.90.+b 220 ≤A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Excited bands of 228Th were studied in the 226Ra(α,2n) reaction by gamma-ray and conversion-electron spectroscopy. The first-excited K π=0+ and 2+ bands were identified up to I π= 12+ and 10+, respectively. The spin dependence of the moments of inertia is discussed. The experimental data indicate a structural change of these bands from 228Th to 230Th and 232Th.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050029
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  • 8
    Electronic Resource
    Electronic Resource
    Nuclear levels in 228Th populated in the decay of 228Pa (II) (1998)
    Springer
    The European physical journal 3 (1998), S. 25-48 
    Details
    ISSN: 1434-601X
    Keywords: PACS:23.20.-g Electromagnetic transitions – 21.60.Jz Hartree-Fock and random-physe approximations – 27.90.+b 220 ≤ A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electron-capture decay of 228Pa to levels in 228Th was studied using mass-separated sources and a γ-ray detection system consisting of five Compton-suppressed Ge detectors. A total of 87 levels were observed up to an excitation energy of 2 MeV which are connected by approximately 500 γ-ray transitions. The complete octupole quadruplet, three excited K π=0+ bands and two K π=2+ bands were identified below 1.4 MeV. The observed level structure is compared to calculations within the quasiparticle-phonon nuclear model. The surprisingly good agreement indicates that 228Th has less transitional character than hitherto assumed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050146
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  • 9
    Electronic Resource
    Electronic Resource
    Study of 227Th in the 226Ra(α,3n) reaction (1998)
    Springer
    The European physical journal 3 (1998), S. 263-270 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 23.20.-g Electromagnetic transitions – 23.20.Nx Internal conversion – 25.70.Gh Compound nucleus – 27.90.+b 220 ≤ A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The nuclear structure of 227Th was studied in the 226Ra (α,3n) reaction by gamma-ray and conversion-electron spectroscopy. Six rotational bands were identified with spins upto approximately 39/2. Attempts to connect these bands to the low-lying levels known from radioactive-decay work were not fully successful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050176
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  • 10
    Electronic Resource
    Electronic Resource
    Nuclear levels in228Th populated in the decay of228Pa (1995)
    Springer
    The European physical journal 352 (1995), S. 47-67 
    Details
    ISSN: 1434-601X
    Keywords: 23.20 ; 25.40 ; 27.90.+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electron-capture decay of228Pa to levels in228Th has been studied using mass-separated sources and high-resolutionγ-ray and conversion-electron spectroscopy. A level at 979.5 keV is assigned as 2+ member of a second excited Kπ=0+ band, with the 0+ band head at 938.6 keV. The 2+ and 3+ members of a second excited Kπ=2+ band at 1153.5 and 1200.5 keV, which decay by strongE0 transitions to the 969 keVγ-vibrational band, are confirmed. In addition we tentatively propose a Kπ=1+ band at 944 keV. The Kπ=0−, 1− and 2− members of the octupole quadruplet are confirmed, and theγ decay of these levels is analysed in an approach, in which the mixing of the octupole bands by the Coriolis interaction is taken into account. It is suggested that octupole correlations might be important for theE1 transition moments. A total of 29 levels is observed between ∼1.4 and ∼2.0 MeV, for which the nuclear structure, and the possible assignment to rotational bands, is unclear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292760
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