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  • 1
    Electronic Resource
    Electronic Resource
    Search for delayed α-decay of high spin isomers in heavy-ion induced fusion reactions (1981)
    Springer
    The European physical journal 301 (1981), S. 349-352 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A search forα-decay of high spin isomers in the mass range 140〈A〈200 is reported. Fusion reactions with beams of132Xe and50Ti have been used to provide high velocity recoils with angular momenta beyond 50ℏ. Recoil distance experiments sensitive to half lives longer than 10 ps and shorter than about 1 ns have been performed for 31 different compound nuclei. Within a sensitivity of 1–30μb per event no delayedα-emission has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421700
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  • 2
    Electronic Resource
    Electronic Resource
    The reaction238U +238U at 7.42MeV/u (1979)
    Springer
    The European physical journal 292 (1979), S. 171-189 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract One-particle-inclusive measurements have been performed for the charge, kinetic energy and angular distributions of reaction products from238U +238U at 1 766MeV (7.42MeV/u) incident energy. The deep inelastic products exhibit features similar to those seen in reactions induced by medium heavy nuclei: increasing particle transfer is observed with increasing energy damping, the angular distributions are peaked near the grazing angle, they broaden significantly with increasing energy loss and/or charge transfer. The dominant reaction mechanism, however, is found to be sequential fission of one or both primary reaction products. The reconstructed primaryZ- andQ-value distributions show more particle transfer at a given energy loss than in other systems, i.e. the diffusion process seems to proceed colder in this system. This is confirmed by relatively large cross sections for surviving deep inelastic reaction products belowZ=92. A direct search forα-decay or fission of superheavy nuclei being produced in a deep inelastic reaction and being implanted in a surface barrier detector resulted in an upper cross section limit of 2 ×10−32cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441624
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: PACS. 25.75.Dw Particle and resonance production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070024
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  • 4
    Electronic Resource
    Electronic Resource
    Quasi-elastic neutron transfer and pairing effects in the interaction of heavy nuclei (1987)
    Springer
    The European physical journal 326 (1987), S. 463-481 
    Details
    ISSN: 1434-601X
    Keywords: 25 ; 70cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental results for neutron transfer in the system112Sn+120Sn are presented for three incident energies 4.25, 4.55 and 4.8 MeV/u. Final states are not resolved, however, the data represent transitions between low-lying states. The data are used to extract transfer probabilities and form factors for neutron transfer between low-lying states. A DWBA analysis gives a quantitative description of the observed overall cross section for one-neutron transfer. The enhancement of the two neutron transfer is discussed using semiclassical arguments; in this context additional data for the systems86Kr+208Pb,58Ni+208Pb,136Xe+238U and208Pb+238U are discussed. The general features of quasielastic transfer probabilities defined in a macroscopic way by an energy resolution of ca. 5–10 MeV, which is so far the only experimental possibility, are shown to give meaningful information on single nucleon and pair transfer between heavy nuclei. The latter point is also supported by coupled channel calculations for the transfer flux in these reactions and it is shown that a strong coupling situation is only reached at distances, where very strong absorption due to deeply inelastic reactions has set in.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289551
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  • 5
    Electronic Resource
    Electronic Resource
    Pairing effects in nucleon transfer reactions in the system144Sm+88Sr at 4.7 MeV/u (1990)
    Springer
    The European physical journal 336 (1990), S. 71-89 
    Details
    ISSN: 1434-601X
    Keywords: 24.10-i ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Proton and neutron transfer populating low-lying states have been studied in the system144Sm+88Sr at an energy below the Coulomb barrier. The experimental cross sections for the single proton transfer are well reproduced by DWBA-calculations using spectroscopic information from light ion reactions. The two-proton transfer appears enhanced relative to the uncorrelated sequential transfer of single protons. The same holds for the transfer of proton pairs, the enhancement is kept for the second pair. This is interpreted as a supercurrent between two superfluid nuclear proton-pair wave functions: more mass and charge is transported per time unit in pairs than by single nucleons. Neutron transfer is observed with large cross sections and is found to contribute to the energy loss observed in the transfer reactions. For mixed proton-neutron transfers the sequential nature of the transfer reactions is established in a similar way as for the two-proton and two-neutron transfer; in the latter case no enhancement is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904165
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  • 6
    Electronic Resource
    Electronic Resource
    Single-nucleon transfer reactions induced by16O on14C (1975)
    Springer
    The European physical journal 275 (1975), S. 249-253 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angular distributions of the proton and neutron transfer reactions14C(16O,15N)15N and14C(16O,17O)13C leading to the ground states of the final nuclei were measured atE lab=20, 25 and 30 MeV. A DWBA analysis was performed using the no-recoil approximation of Buttle and Goldfarb. All angular distributions, including the pronounced structures of the proton transfer arising from the fact that the final nuclei are identical, are well reproduced. The spectroscopic factor for the neutron transfer is in agreement with shell model calculations whereas the proton transfer into aj 〈-state yields a value which is too high. Exact finite-range calculations do not show this discrepancy, indicating that recoil effects are important even for light targets and lower energies. Contributions of the nonnormall-transfer, however, are small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409292
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  • 7
    Electronic Resource
    Electronic Resource
    A study of the influence of shell effects in nuclear level densities on the decay of the compound nucleus58Ni (1979)
    Springer
    The European physical journal 290 (1979), S. 167-172 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mass andZ-distributions of fusion products from the reaction 5.8 MeV/u46Ti+12C were measured in the angular range betweenθ lab=1.5° and 8° using a time-of-flightΔE−E telescope. The results are compared with an earlier measurement of the reaction32 S+26Mg, in which the same compound nucleus was produced at higher excitation energy. The residual nuclide distributions are interpreted with the aid of evaporation calculations and the influence of shell effects in the level densities is discussed. The data are consistent with the assumption that the shell effects vanish above 15 to 20 MeV excitation energy, that is, that they are essentially only important for the last evaporation step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408111
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  • 8
    Electronic Resource
    Electronic Resource
    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
    Keywords: 25.70.Lm ; 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411896
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  • 9
    Electronic Resource
    Electronic Resource
    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
    Keywords: 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295255
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  • 10
    Electronic Resource
    Electronic Resource
    Properties of high-energy pions emitted from heavy-ion collisions at 1 GeV/nucleon (1995)
    Springer
    The European physical journal 352 (1995), S. 175-179 
    Details
    ISSN: 1434-601X
    Keywords: 25.75.+r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positively charged pions and protons from collisions of Ne+NaF and Au+Au at 1 GeV/nucleon incident energy were measured near midrapidity. The center-of-mass pion spectra deviate from a Maxwell-Boltzmann distribution. The slope of the high-energy part of the pion spectra varies significantly with the system mass and little with the size of the reaction zone. While the total pion yield rises linearly with the number of participant nucleons, the highenergy component increases more than linearly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01298905
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