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arXiv 2202.13850nucl-exphysics.atom-ph
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35 MeV/nucleon时$^{40,48}$ Ca+ $^{40,48}$ Ca反应的实验研究

Experimental study of the $^{40,48}$Ca+ $^{40,48}$Ca reactions at 35 MeV/nucleon

Q. Fable, A. Chbihi, M. Boisjoli, J. D. Frankland, A. Le Fèvre, N. Le Neindre, P. Marini, G. Verde, G. Ademard, L. Bardelli, C. Bhattacharya, S. Bhattacharya, E… 展开作者

Q. Fable, A. Chbihi, M. Boisjoli, J. D. Frankland, A. Le Fèvre, N. Le Neindre, P. Marini, G. Verde, G. Ademard, L. Bardelli, C. Bhattacharya, S. Bhattacharya, E. Bonnet, B. Borderie, R. Bougault, G. Casini, M. Commara, R. Dayras, J. E. Ducret, F. Farget, E. Galichet, T. Génard, F. Gramegna, D. Gruyer, M. Henri, S. Kundu, J. Lemarié, Olivier Lopez, J. Łukasik, L. Manduci, J. Moisan, G. Mukherjee, P. Napolitani, A. Olmi, M. Pârlog, S. Piantelli, G. Poggi, A. Rebillard-Soulié, R. Roy, B. Sorgunlu, S. Velardita, E. Vient, M. Vigilante, J. P. Wieleczko

摘要:

在这篇文章中,我们研究了$^{40,48}$ Ca+ $^{40,48}$ Ca在35 MeV/核子的外周和半外周反应。数据是利用VAMOS高接受度光谱仪和INDUSTRIAL带电粒子多探测器的独特耦合获得的,该光谱仪可以高分辨率测量冷射弹状碎片(PLF)的电荷、质量和速度,而INDUSTRY探测器记录到符合的带电粒子,接近$4π$接受度。多重性是研究同位旋扩散的一个很有希望的观测量,PLF与LCP的同时探测可以重建初始准抛射核(QP)的质量、电荷和激发能,我们用PLF和实验重建的QP研究了等标度法的适用性,提取的$α$和$Δ$等标度值与实验数据吻合较好,并与实验数据进行了比较参数提出了一个依赖于所考虑的系统组合,可以证明他们的使用作为一个替代的同位旋不对称性的同位旋输运studies.The重建的QP允许观察到的$α/Δ$与QP的大小的演变,后者是一致的强表面贡献的对称性能量项在有限的核。这导致的结论是,重建的主要来源是强制性的对称性能量项的研究基础上的isoscaling方法为此类反应。

英文摘要:

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 $4π$ 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 $α$ and $Δ$ 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 $α/Δ$ 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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