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    • Experimental study of the Ca40,48+

    Physical Review C（2022）SCI 2区SCI 1区

    Cited 0|Views19
    Abstract
    In this article we investigate $^{40,48}$Ca+$^{40,48}$Ca peripheral and semi-peripheral reactions at 35 MeV/nucleon. Data were obtained using the unique coupling of the VAMOS high acceptance spectrometer and the INDRA charged particle multidetector.The spectrometer allowed high resolution measurement of charge, mass and velocity of the cold projectile-like fragment (PLF), while the INDRA detector recorded coincident charged particles with nearly $4\pi$ acceptance.The measured isotopic composition of the PLF identified in VAMOS and the average light charged particle (LCP) multiplicities are promising observables to study the isospin diffusion.The detection of the PLF in coincidence with LCP allows the reconstruction of the mass, charge and excitation energy of the associated initial quasi-projectile nuclei (QP), as well as the extraction of apparent temperatures.We investigate the suitability of the isoscaling method with the PLF and the experimental reconstructed QP.The extracted $\alpha$ and $\Delta$ isoscaling parameters present a dependence on the considered system combination that could justify their use as a surrogate for isospin asymmetry in isospin transport studies.The reconstruction of the QP allows to observe an evolution of the $\alpha/\Delta$ with the size of the QP, the latter being consistent with a strong surface contribution to the symmetry energy term in finite nuclei. This leads to the conclusion that the reconstruction of the primary source is mandatory for the study of the symmetry energy term based on the isoscaling method for such reactions.
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    【要点】：本研究通过$^{40,48}$Ca+$^{40,48}$Ca的边缘和准边缘反应，探讨了同位素扩散及对称能项的研究方法，提出利用重建的准弹核来分析$\alpha/\Delta$参数的变化，进而推断对称能表面贡献。
    

    【方法】：使用VAMOS高接受度谱仪和INDRA带电粒子多探测器耦合的独特设置，实现了对冷弹核碎片的高分辨率测量，并结合带电粒子的测量来重建准弹核的质量、电荷和激发能量。
    

    【实验】：通过35 MeV/nucleon的$^{40,48}$Ca+$^{40,48}$Ca反应实验，获取了VAMOS识别的弹核碎片的同位素组成和平均轻带电粒子产额，使用这些数据研究了同位素扩散，并提取了$\alpha$和$\Delta$同位素标度参数。
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