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  • 1990-1994  (1)
  • 1975-1979  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    Mechanism of formation and decay of the compound nuclei150Gd produced by two entrance channels (16O+134Ba) and (40Ar+110Pd) (1977)
    Springer
    The European physical journal 282 (1977), S. 65-73 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Excitation functions have been drawn for evaporation residues issued from150Gd, a compound nucleus produced either by16O ions on134Ba, or by40Ar on110Pd. Absolute cross sections were measured for145–147Gd,145–147Eu,141m Sm,143m Sm,140m Pm and139m Nd. Complete fusion cross sections have been obtained and compared to calculated estimations based, at low energies, on the simple expressionσ CF=πR Fuss 2 (1−V Fus/E) whereR Fus andV Fus are respectively the distance and the potential for fusion atdV/dr=0. For high energies σCF=πR cr 2 (1−Vcr/E) with the model of critical distanceR cr and critical potentialV cr. Thresholds energies have been determined with a particular care. The analysis of the shape and the width of excitation functions, particularly for the emission of 4 and 5 neutrons, has been carried out and compared to calculated values. The difference between argon and oxygen induced reactions has been attributed to the difference inl population in the entrance channel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01881007
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  • 2
    Digitale Medien
    Digitale Medien
    Dynamics and thermalization in violent collisions between40Ar and Ag at 27 MeV/nucleon (1991)
    Springer
    The European physical journal 340 (1991), S. 63-77 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Gh ; 25.70.Jj ; 25.70.Lm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract For the violent collisions of 27 MeV/nucleon40Ar with Ag, coincidence measurements have been made between heavy residues and intermediate mass fragments (3≦Z≦14) or light charged particles. From the analysis of the correlation between heavy residues (mass and velocity) and intermediate mass fragments, the main characteristics of the dominant mechanisms, fusion and partially damped collisions preceded or accompanied by a preequilibrium emission, are presented. Balances concerning mean values of parallel linear momentum, mass and atomic number, are established and confirm that a complete description of violent collisions was obtained. Then thermalization is discussed, first in terms of excitation energies derived from kinematics between heavy residues and intermediate mass fragments, and secondly in terms of initial temperature estimates derived from light charged particle spectra. Very hot nuclei (T⋍5.7–6.6 MeV) are produced over a large impact parameter range from very central collisions to medium peripheral ones. Various experimental results are compared to predictions obtained with semi-classical calculations (Landau-Vlasov equation). From their good agreement one may conclude that, depending on the impact parameter, thermal equilibrium is achieved within 4–10×10−22 s.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01284482
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  • 3
    Digitale Medien
    Digitale Medien
    Copper ion induced reactions on110-108-106Cd,109-107Ag and110Pd. new rhenium, osmium and iridium isotopes (1978)
    Springer
    The European physical journal 287 (1978), S. 71-83 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract By63Cu induced reactions on110Cd,108Cd,106Cd,109Ag,107Ag and110Pd targets, new isotopes were searched in the Ir, Os, Re region. Cross bombardments and excitation function measurements were used to identify newα emitting isotopes:170Ir (E α = 6.01 ±0.01 MeV−T 1/2=1.1±0.2s),169Ir (E α =6.11±0.01 MeV−T 1/2=0.4±0.1 s),168Ir (E α =6.22±0.02 MeV,168Os (E α =5.66±0.01 MeV−T 1/2=1.9±0.1 s),167Os (E α =5.84 ±0.01MeV −T 1/2=0.65±0.15s),166Os (E α =6.00±0.02 MeV−T 1/2=0.3 ±0.1 s),165Os (E α =6.20±0.02 MeV),169Re (E α =5.05±0.01 MeV),168Re (5.26±0.01 MeV−T 1/2=5.5 ±0.5 s). Theα-decay measurements are compared to theQ α values obtained from different mass predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408363
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  • 4
    Digitale Medien
    Digitale Medien
    Comparison between experimental decay of the compound nuclei150Gd and evaporation calculations (1977)
    Springer
    The European physical journal 282 (1977), S. 75-82 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The deexcitation of the compound nucleus150Gd formed by156O+134Ba and40Ar+110Pd have been studied. Excitation functions were determined for various exit channels: (HI, × n) withx=3, 4, 5 (HI, pxn) withx=2, 3, 4 (HI, axn) withx=3 and 5. A systematic comparison has been made between these experimental data and the results of evaporation calculation using the ALI CE code. The very good agreement obtained for the total residue cross section disappears completely when a more detailed analysis of the different contributions is performed. Absolute and relative cross sections are not reproduced; excitation functions of each individual channel (HI, 3n), (HI, 4n) etc. ... are not found at the right place in energy. A very preliminary explanation for such a shift towards higher energies is suggested.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01881008
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  • 5
    Digitale Medien
    Digitale Medien
    Evaporation residue cross sections in complete fusion reactions between52Cr-56Fe,63Cu-Ni and63Cu-Ag (1976)
    Springer
    The European physical journal 278 (1976), S. 265-267 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Evaporation residue cross sections have been measured by the technique of the telescopeΔE ·E counter at very small angles. The angular distribution has been followed down to 2°15′, and rather precise values were obtained for that fraction of the compound nucleus decay after complete fusion for the systems63Cu+Ni,63Cu+Ag and52Cr+56Fe at two bombarding energies. A comparison has been done with evaporation calculations using the code ALICE, and the rotating liquid drop concept. It is shown that a large discrepancy occurs at low energy for these heavy projectiles. The origin of this difference is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01409177
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  • 6
    Digitale Medien
    Digitale Medien
    New osmium and iridium isotopes produced through63Cu induced reactions (1977)
    Springer
    The European physical journal 283 (1977), S. 221-222 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01418716
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