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  • 25.70-z  (1)
  • 25.70. Jj  (1)
  • 25.70.Mn  (1)
  • 25.70.Pq  (1)
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  • 1
    ISSN: 1434-601X
    Keywords: 25.70.Lm ; 25.70.Mn ; 25.70.Pq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inclusive cross sections of intermediate mass fragments from the reaction84Kr+197Au atE/A=35 MeV were measured over the range 8°≦Θ lab≦70° with a low detection threshold. A moving-source parameterization was used to fit the double-differential cross sections. The integrated cross section for fragment production exceeds the total reaction cross section thus indicating a large probability for multi-fragment processes. The deduced large temperature parameters can be explained by assuming emission from a rotating source. From the comparison to reactions with12C and40Ar projectiles at E/A=30 MeV a systematics of inclusive fragment production as a function of the projectile mass is obtained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 328 (1987), S. 101-113 
    ISSN: 1434-601X
    Keywords: 25.70-z ; 25.70.Np ; 25.70.Gh ; 25.70.Jj ; 05.90.+m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a simple model to describe the evolution of hot and compressed nuclei. It is based on irrotational hydrodynamics and a 3-dimensional site-bond percolation model. Hydrodynamics is used if the evolution of the system is dominated by the mean field. This situation occurs when the fluctuations of the mean field are small. These latter are evaluated using the percolation model. In some cases it turns out that these fluctuations become very large and the system breaks up into several pieces (multifragmentation). The results of this process are described by the percolation model. We have obtained analytical or fitted expressions for all the results which compare well with those obtained in a previous and more involved model based on the same physical ideas. In particular we found that a noncompressed nucleus undergoes multifragmentation if the thermal excitation energy is larger than 70% of its binding energy. If the nucleus is compressed this value is notably decreased.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 322 (1985), S. 419-426 
    ISSN: 1434-601X
    Keywords: 25.70. Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have developed a very schematic static model to calculate the most probable amount of linear momentum transfer, $$\tilde \rho$$ , that a projectile can transmit to a fusing system in heavy ion collisions at bombarding energies between ∼10 and 20 MeV/u. This approach estimates the conditions necessary in phase space for nucleons to be emitted by the mean field of one of the two nuclei. Due to its simplicity this model gives a qualitative description of the data and it is only expected to provide some general numerical trends of $$\tilde \rho$$ as a function of the macroscopic parameters of the reaction. It is found that $$\tilde \rho$$ depends not only on the bombarding energy per nucleon but also on the masses of the projectiles and targets. Finally, the question of the amount of maximum energy that a nucleus can sustain under the condition of global statistical equilibrium is investigated. It is found that the mass asymmetry of the system is an all important parameter in determining the limits of fusion related to this maximum excitation energy content.
    Type of Medium: Electronic Resource
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