New alpha-Emitting Isotope U-214 and Abnormal Enhancement of alpha-Particle Clustering in Lightest Uranium Isotopes
New alpha-Emitting Isotope U-214 and Abnormal Enhancement of alpha-Particle Clustering in Lightest Uranium Isotopes
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新的α发射同位素U-214和最轻铀同位素中α粒子簇的异常增强
DOI：
10.1103/physrevlett.126.152502
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发表时间：
2021
影响因子：
8.6
通讯作者：
Huang W. X.
中科院分区：
文献类型：
--
作者：
Zhang Z. Y.;Yang H. B.;Huang M. H.;Gan Z. G.;Yuan C. X.;Qi C.;Andreyev A. N.;Liu M. L.;Ma L.;Zhang M. M.;Tian Y. L.;Wang Y. S.;Wang J. G.;Yang C. L.;Li G. S.;Qiang Y. H.;Yang W. Q.;Chen R. F.;Zhang H. B.;Lu Z. W.;Xu X. X.;Duan L. M.;Yang H. R.;Huang W. X.
利用充满气体的反冲分离器SHANS和反冲相关技术，确定了一种由聚变-蒸发反应产生的新发射同位素。更精确的甚至偶核的衰变特性也在靶束的反应中得到了测量。结合实验数据，推导出了在幻中子数附近偶偶Po-Pu核的改进衰变缩减宽度。为了研究质子-中子相互作用对这一区域核衰变的影响，我们根据这一方案讨论了它们的系统趋势。令人惊讶的是，与双偶核相比，其减小宽度显著提高了两倍。这种异常增强可以用占据自旋轨道伙伴轨道的价质子和中子之间的强单极相互作用来解释，这得到了大尺度壳层模型计算的支持。
A new-emitting isotope, produced by the fusion-evaporation reaction, was identified by employing the gas-filled recoil separator SHANS and the recoil-correlation technique. More precise-decay properties of even-even nucleiwere also measured in the reactions of,beams withtargets. By combining the experimental data, improved-decay reduced widthsfor the even-even Po-Pu nuclei in the vicinity of the magic neutron numberare deduced. Their systematic trends are discussed in terms of thescheme in order to study the influence of proton-neutron interaction ondecay in this region of nuclei. It is strikingly found that the reduced widths ofare significantly enhanced by a factor of two as compared with thesystematics for theandeven-even nuclei. The abnormal enhancement is interpreted by the strong monopole interaction between the valence protons and neutrons occupying theandspin-orbit partner orbits, which is supported by the large-scale shell model calculation.