Cluster transfer in the reaction 16 O + 208 Pb at energies well below the fusion barrier: A possible doorway to energy dissipation
Cluster transfer in the reaction 16 O + 208 Pb at energies well below the fusion barrier: A possible doorway to energy dissipation
复制标题
16 O 208 Pb 反应中能量远低于聚变势垒的团簇转移：能量耗散的可能途径
DOI：
10.1103/physrevc.84.054614
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发表时间：
2011
影响因子：
3.1
通讯作者：
C. Simenel
中科院分区：
文献类型：
--
作者：
M. Evers;M. Dasgupta;D. Hinde;D. H. Luong;R. Rafiei;R. Rietz;C. Simenel
双幻核O+Pb的碰撞是核反应研究中的一个基准。我们在亚势垒能下对后向散射弹状碎片的最新测量表明，2质子($2p$)的转移比α粒子转移的可能性要大得多。与两个不相关质子的顺序转移的预期相比，$2p$转移几率大大提高；在聚变势垒附近的能量下，两个质子转移的绝对概率与一个质子转移的绝对概率相似。这种强烈的增强表明在{16}$O中有很强的$2p$配对关联，并表明在这个反应中出现了两质子库珀对的核超流，该超流的能量已经远低于聚变势垒。
The collision of the doubly-magic nuclei $^{16}$O+$^{208}$Pb is a benchmark in nuclear reaction studies. Our new measurements of back-scattered projectile-like fragments at sub-barrier energies show show that transfer of 2 protons ($2p$) is much more probable than $\alpha$-particle transfer. $2p$ transfer probabilities are strongly enhanced compared to expectations for the sequential transfer of two uncorrelated protons; at energies around the fusion barrier absolute probabilities for two proton transfer are similar to those for one proton transfer. This strong enhancement indicates strong $2p$ pairing correlations in $^{16}$O, and suggests evidence for the occurrence of a nuclear supercurrent of two-proton Cooper pairs in this reaction, already at energies well below the fusion barrier.