Isoscaling in statistical sequential decay model

Isoscaling in statistical sequential decay model
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统计顺序衰减模型中的等尺度

DOI:
10.1088/0256-307x/24/2/023
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发表时间:
2007-02
影响因子:
3.5
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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采用顺序衰变模型来研究等标度,即在广泛的激发能范围内,将不同同位旋和大小的同位素比值分解为质子和中子数的逸度项,R21(N,Z) = Y2(N,Z)/Y1(N,Z) = Ce(αN+βZ)。发现等标度参数α和β与平衡源和激发能的同位旋差有很强的依赖性,源尺寸对α和β没有明显的影响。α和β随激发能的增大而减小,并与源的1/T和Δ(Z/A)2或Δ(N/A)2成线性关系。对称能系数Csym受α与源Δ(Z/A)2、β与源Δ(N/A)2的关系约束。
A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron number, R21(N,Z) = Y2(N,Z)/Y1(N,Z) = Ce(αN+βZ). It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the source size on α and β has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and Δ(Z/A)2 or Δ(N/A)2 of the sources. Symmetry energy coefficient Csym is constrained from the relationship of α and source Δ(Z/A)2, β and source Δ(N/A)2.
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