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arXiv 2211.15134nucl-ex
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慢准fission的新壳层闭核证据

Evidence of a new shell closed nucleus governing slow quasi-fission

A. Pal, S. Santra, A. Kundu, D. Chattopadhyay, P. C. Rout, Ramandeep Gandhi, P. N. Patil, R. Tripathi, B. J. Roy, Y. Sawant, T. N. Nag, Abhijit Baishya, T. Sant… 展开作者

A. Pal, S. Santra, A. Kundu, D. Chattopadhyay, P. C. Rout, Ramandeep Gandhi, P. N. Patil, R. Tripathi, B. J. Roy, Y. Sawant, T. N. Nag, Abhijit Baishya, T. Santhosh, P. K. Rath, N. Deshmukh

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摘要：

通过对几种反应的测量分布与基于复合核裂变模型的理论分布的比较，导出了慢准裂变过程产生的裂变碎片的质量分布。所有系统对应于准裂变事件的质量分布显示出以下共同特征：（2）准裂变事件产额随入射能量的增加而减小;（3）在A $\sim$ 96处均观察到对应于轻碎片的峰值。而较重碎片的峰值随双核系统的质量线性增加。这些观测结果与已知的锕系元素非对称裂变中的观测结果十分相似，从而为慢准裂变中的壳效应提供了明确的证据，其中较轻的碎片可能是围绕$^{96}$ Zr这一新的双幻核的核。这一发现对研究核反应、结构，特别是在超重元素合成中准裂变是同义词有重要意义。

英文摘要：

Mass distributions of fission fragments arising from the slow quasi-fission process have been derived by comparing the measured distributions with the theoretical distributions based on compound nuclear fission model for several reactions. The mass-distributions corresponding to quasi-fission events for all the systems show the following common features: (1) they are double peaked with fixed peak-centroids and nearly same width at different incident energies, (2) the yield of quasi-fission events decreases with the increasing projectile energy, and (3) peak corresponding to lighter fragment is observed at A $\sim$ 96 for all the systems, whereas the peak of heavier fragment increases linearly with the mass of the di-nuclear system. All the above observations are quite similar to the ones observed in well known asymmetric fission of actinides, thus providing clear evidences of shell effect in slow quasi-fission where the lighter fragment is possibly nuclei around $^{96}$Zr, a new doubly magic nucleus. This finding has great implications in the study of nuclear reactions, structure and particularly in super-heavy element synthesis where quasi-fission is synonymous.

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