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  • 11
    Electronic Resource
    Electronic Resource
    Positron lines from subcritical heavy ion-atom collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 129-145 
    Details
    ISSN: 1434-601X
    Keywords: 14.60.Cd ; 25.70.Cd ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positron lines were observed in heavy ion-atom collisions at bombarding energies close to the Coulomb barrier in subcritical systems with the sum of the atomic numbers of the colliding nucleiZ u =Z 1+Z 2 being smaller thanZ u =172. Each collision system, studied,208Pb +208Pb(Zu=164),238U+181Ta(Zu=165), and238Au(Zu=171), exhibits the emission of two positron lines withZ u -independent c.m. energies of ∼ 258 keV and ∼ 340 keV, and with widths of about 30 keV, superimposed on continuous positron spectra from nuclear pair decay and pair emission induced by the time changing Coulomb field of the collision. The production cross section of thee +-lines rises with a high power ofZ u (ocZ u 22), which is comparable to theZ u 20-dependence for the collision induced positrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290655
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  • 12
    Electronic Resource
    Electronic Resource
    On the production mechanism of the narrow positron lines observed in heavy-ion collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 499-500 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following a suggestion of Bang et al. we deduce that the total energy transfer associated with the narrow positron lines observed in heavy-ion collisions is given approximately by the sum of the rest masses of the positron and the accompanied electron plus their kinetic energies. Since the same behaviour has been established previously for the production process of the dynamically induced positrons, our observation represents a strong hint that the origin of the e+ -lines may also be connected with the strong Coulomb field occuring in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289639
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  • 13
    Electronic Resource
    Electronic Resource
    Asymptotic attenuation coefficients in random perturbations of Angular Correlations (1977)
    Springer
    The European physical journal 280 (1977), S. 329-339 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time-differential attenuation coefficients for randomly fluctuating interactions in isotropic systems are shown to be of the simple exponential type (well known from the first order treatment of Abragam and Pound) fort≫Τ c , notwithstanding the strength of 〈Ω2〉1/2Τ c . Explicit expressions for the relaxation constant are given which are strongly dependent on the strength of 〈Ω2〉1/2Τ c and on the type of interaction but prove to be virtually independent of the stochastic model assumptions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435441
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  • 14
    Electronic Resource
    Electronic Resource
    Indonesian mungbean landraces I. Pure-line selection for yield when intercropped with maize (1987)
    Springer
    Euphytica 36 (1987), S. 783-790 
    Details
    ISSN: 1573-5060
    Keywords: Vigna radiata ; mungbean ; Zea mays ; maize ; landrace ; intercropping ; pure-line selection ; yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary When mungbean landraces from East Java were intercropped with maize, genetic variation for grain yield was observed. Three cycles of selection resulted in a yield increase of 24% as compared to the original landraces. The yield of the maize component in the mixture was not affected by the increase of the mungbean yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051861
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  • 15
    Electronic Resource
    Electronic Resource
    Indonesian mungbean landraces II. Comparison of performance, components of variance and selection for grain yield under wide row-spacing in monoculture and when intercropped with maize (1987)
    Springer
    Euphytica 36 (1987), S. 791-801 
    Details
    ISSN: 1573-5060
    Keywords: Vigna radiata ; mungbean ; Zea mays ; maize ; landrace ; intercropping ; monoculture ; genotype x environment interaction ; single-plant selection ; progeny selection ; grain yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The possibility of testing mungbean for grain yield in monoculture in single wide-spaced row plots as an alternative to selection in intercropping with maize was investigated. Results indicated no significant genotype x planting pattern interactions and genetic correlation coefficients between grain yields in the two planting patterns were, in most cases, close to unity. It was concluded that, as far as the mungbean component in the mixture is concerned, yield selection in either of the two planting patterns is justified. Effects of single-plant and progeny selection on mungbean characteristics were also studied empirically. Lines derived from single-plant selection in monocropping or intercropping showed differences in yield, number of pods per plant and seed weight. Except for seed weight, no differential effects of progeny selection in monoculture or intercropping were observed for any characteristic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051862
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  • 16
    Electronic Resource
    Electronic Resource
    K x-ray emission in gas- and solid targets in close heavy ion-atom collisions (1987)
    Springer
    The European physical journal 5 (1987), S. 49-55 
    Details
    ISSN: 1434-6079
    Keywords: 34.50H ; 34.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Impact parameter dependentK x-ray emission from both collision partners in208Pb+26 →120Sn and Xe collisions at 3,6 MeV/N projectile has been investigated. In solid target collisions the Sn-K emission yield shows impact parameter dependent structures. These structures are interpreted in terms of post-collisional capture processes. TheK x-ray emission from the heavier collision partner related to the 1s σ vacancy production, is found to be dependent on the primary projectile outer-shell configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436573
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  • 17
    Electronic Resource
    Electronic Resource
    Influence of electronic deexcitation cascades on gamma-ray angular correlations in highly stripped free ions (1975)
    Springer
    Hyperfine interactions 1 (1975), S. 255-263 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A stochastic model is described which simulates the hyperfine interaction in highly stripped light ions. The coupling of the electrons to the nucleus is of the fluctuating type during the deexcitation process of the electron shell and of the static type for electrons in the ground state. In the limit of very fast deexcitation the time-differential attenuation coefficients of the perturbed angular correlation are essentially those of the static ground-state coupling with a phase shift and a reduction of the amplitude imposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022458
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