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  • Digitale Medien  (3)
  • 25.70.Jj  (2)
  • PACS. 25.75.Dw Particle and resonance production  (1)
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  • Digitale Medien  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Production of charged pions, kaons and antikaons in relativistic C + C and C + Au collisions (2000)
    Springer
    The European physical journal 9 (2000), S. 397-410 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 25.75.Dw Particle and resonance production
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Production cross-sections of charged pions, kaons and antikaons have been measured in C+C and C+Au collisions at beam energies of 1.0 and 1.8 AGeV for different polar emission angles. The kaon and antikaon energy spectra can be described by Boltzmann distributions whereas the pion spectra exhibit an additional enhancement at low energies. The pion multiplicity per participating nucleon M(π+)/〈A part〉 is a factor of about 3 smaller in C+Au than in C+C collisions at 1.0 AGeV whereas it differs only little for the C and the Au target at a beam energy of 1.8 AGeV. The K+ multiplicities per participating nucleon M(K+)/ 〈A part〉 are independent of the target size at 1 AGeV and at 1.8 AGeV. The K- multiplicity per participating nucleon M(K-)/ 〈A part〉 is reduced by a factor of about 2 in C+Au as compared to C+C collisions at 1.8 AGeV. This effect might be caused by the absorption of antikaons in the heavy target nucleus. Transport model calculations underestimate the K-/K+ ratio for C+C collisions at 1.8 AGeV by a factor of about 4 if in-medium modifications of K-mesons are neglected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500070024
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  • 2
    Digitale Medien
    Digitale Medien
    A fast-fission component with small mass drift in the reaction84Kr+27Al atE lab=5.9 MeV/u (1985)
    Springer
    The European physical journal 322 (1985), S. 309-314 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Lm ; 25.70.Jj
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract All reaction products in the range from target- and projectile-like to fission-like fragments were measured for the system84Kr+27Al at 5.9 MeV/u beam energy. They are assigned to the various reaction mechanisms on the basis of experimental signatures (energy dissipation, mass and angular distribution). The sum of the measured partial cross sections, including the evaporation residue yield obtained previously, agrees with the total reaction cross section derived from elastic scattering. A small fast-fission component was found, discernible from deep-inelastic reactions by its 1/sin θ angular distribution, and distinguished from compound-nucleus fission by an incomplete mass asymmetry relaxation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01411896
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  • 3
    Digitale Medien
    Digitale Medien
    Particle emission in central nuclear collisions between48Ti und45Sc at 16 MeV/u (1987)
    Springer
    The European physical journal 327 (1987), S. 101-107 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Jj
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Protons and α-particles were measured in coincidence with fusion residues for the reaction48Ti+45Sc at 16 MeV/u beam energy. Their velocity distributions show a drastic broadening to higher as well as to lower velocities as compared to the calculated equilibrium emission pattern. This is interpreted as a kinematical effect of variations of the initial velocity of the emitting system, which are attributed to the preequilibrium emission of heavier clusters from the projectile or the target nucleus in incomplete fusion processes. The measured widths of the velocity distributions of the fusion residues are consistent with this mechanism. A peak in the product mass spectrum at masses between 6 and 18 is tentatively identified with the postulated cluster emission.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01295255
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