Isotopic Scaling in Nuclear Reactions

National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
Physical Review Letters (Impact Factor: 7.51). 05/2001; 86(22):5023-6. DOI: 10.1103/PhysRevLett.86.5023
Source: PubMed


A three parameter scaling relationship between isotopic distributions for elements with Z< or =8 has been observed. This allows a simple description of the dependence of such distributions on the overall isospin of the system. This scaling law (termed isoscaling) applies for a variety of reaction mechanisms that are dominated by phase space, including evaporation, multifragmentation, and deeply inelastic scattering. The origins of this scaling behavior for the various reaction mechanisms are explained. For multifragmentation processes, the systematics is influenced by the density dependence of the asymmetry term of the equation of state.

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    • "We will focus our study on the thermodynamical properties of infinite symmetric matter. Note, however, that error propagation in hot isospin asymmetric nuclear matter can provide an additional handle on the symmetry energy [23] [24]. "
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    ABSTRACT: We study symmetric nuclear matter at finite temperature, with particular emphasis on the liquid-gas phase transition. We use a standard covariance analysis to propagate statistical uncertainties from the density functional to the thermodynamic properties. We use four functionals with known covariance matrices to obtain as wide a set of results as possible. Our findings suggest that thermodynamical properties are very well constrained by fitting data at zero temperature. The propagated statistical errors in the liquid-gas phase transition parameters are relatively small.
    Journal of Physics G Nuclear and Particle Physics 07/2014; 42(3). DOI:10.1088/0954-3899/42/3/034005 · 2.78 Impact Factor
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    • "On the other hand, much smaller values of the fitting parameter B in the mass region 7 ≤ A ≤ 30 may point to a possible multifragmentation mechanism in the formation of these light fragments [17] [10]. A different situation may be seen in the mass region 40 ≤ A ≤ 60, both for proton-and deuteron-induced reactions. "
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    ABSTRACT: We measure cross sections for residual nuclide formation in the mass range 6 < A < 97 caused by bombardment with protons and deuterons of 3.65 GeV/nucleon energy of enriched tin isotopes (112-Sn, 118-Sn, 120-Sn, 124-Sn). The experimental data are compared with calculations by the codes FLUKA, LAHET, CEM03, and LAQGSM03. Scaling behavior is observed for the whole mass region of residual nuclei, showing a possible multifragmentation mechanism for the formation of light products (6 < A < 31). Our analysis of the isoscaling dependence also shows a possible contribution of multifragmentation to the production of heavier nuclides, in the mass region 39 < A < 81. Comment: 16 pages, LaTeX, 6 figures, 6 tables, submitted to Yadernaya Fizika (Physics of Atimoc Nuclei)
    Physics of Atomic Nuclei 06/2005; DOI:10.1134/S1063778806090079 · 0.51 Impact Factor
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    ABSTRACT: Multifragmentation is observed in many reaction types: light-ion-induced reactions at large incident energies (in the GeV region), central heavy-ion collisions from 30 to 100MeV/u, and peripheral heavy-ion collisions between 30 and 1000MeV/u or above. When nucleus-nucleus collisions are considered, another entrance channel parameter is the corresponding mass asymmetry. The first question which is addressed in this contribution is: do we observe similar reactions in each case? Multifragmentation may be related to a phase transition of nuclear matter. Some others features indicate that dynamical features are dominant. It is a priori possible that the underlying mechanisms are different in proton- and nucleus-induced reactions, in central and in peripheral collisions, at limited and at large bombarding energies. In order to see to what extent they can reflect similar behaviour, it is useful to compare the results of various reactions. The observables can be the fragment multiplicity, the mass distributions or the kinematical properties. In this contribution, we are looking for such general features. We will limit the discussion to the observations themselves, rather than the interpretation, which is the subject of numerous entries in this volume. The experimental results indicate that multifragmentation exhibits at the same time universal and entrance-channel-dependent properties.
    European Physical Journal A 10/2006; DOI:10.1140/epja/i2006-10108-7 · 2.74 Impact Factor
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