Multifragmentation of reconstructed quasi-projectiles in the mass region A ∼ 30
Multifragmentation of reconstructed quasi-projectiles in the mass region A ∼ 30
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重建准射弹在质量区域 A 〜 30 中的多碎裂
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Yennello
中科院分区：
文献类型：
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作者：
S. Soisson;A. Botvina;G. Souliotis;B. Stein;L. Heilborn;A. Keksis;Z. Kohley;L. May;D. Shetty;S. Wuenschel;S. Yennello
研究了 32S（45 MeV/核子）与 112Sn 相互作用中获得的各种重构准射弹碎片的产生。通过基于深度非弹性传递和 SMM（统计多碎裂模型）的模型框架，获得了对这些轻型准射弹多碎裂实验数据的良好描述。观察到的碎片的电荷和质量分布表明，给定准射弹源的分解与其同位旋组成高度相关。详细研究了热初级碎片对对称能的敏感性。研究发现，对于现有的光系统（A~30），通过涉及标准（Csym = 25 MeV）以及对称能约化值（Csym = 8 MeV）的SMM计算，可以很好地描述碎片的电荷分布、<N/Z>分布和同位素分布的实验数据。然而，在大多数情况下，对称能的减小值似乎可以更好地描述同位素分布。这与许多较重系统的多碎裂研究表明的初级碎片对称能的整体降低是一致的。
The production of fragments from a broad range of reconstructed quasi-projectiles obtained in the interaction of 32S (45 MeV/nucleon) with 112Sn was studied. A good description of the experimental data on the multifragmentation of these light quasi-projectiles with a model framework based on deep inelastic transfer followed by SMM (statistical multifragmentation model) was obtained. The charge and mass distributions of the observed fragments show that the break-up of a given quasi-projectile source is highly correlated to its isospin composition. The sensitivity of the hot primary fragments to the symmetry energy was investigated in detail. It was found that for the present light systems (A~30), a good description of the experimental data on the charge distributions, the 〈N/Z〉 distributions and the isotopic distributions of the fragments is obtained by the SMM calculations involving the standard (Csym = 25 MeV), as well as, a reduced value of the symmetry energy (Csym = 8 MeV). However, the reduced value of the symmetry energy appears to provide a better description of the isotopic distributions in most of the cases. This is in agreement with an overall reduction of the symmetry energy of primary fragments indicated by a number of multifragmentation studies of heavier systems.