一种新的$α$ -成簇现象：$^{212}$ Po中新的“$α$ + $^{208}$ Pb”态的增强E1衰变
A novel manifestation of $α$-clustering: new '$α$ + $^{208}$Pb' states in $^{212}$Po revealed by their enhanced E1 decays
摘要：
利用$^{208}$ Pb（$^{18}$ O，$^{14}$ C）反应通过$α$转移布居了$^{212}$ Po的激发态，并用Euroball阵列研究了它们的去激发$γ$ -射线.几个级别被发现衰减一个独特的E1跃迁（E $_γ<$ 1兆电子伏）填充的yrast状态具有相同的自旋值。用DSAM方法测量了它们的寿命。在[0.1-1.4] ps范围内发现的值导致非常增强的跃迁，B（E1）= 2 $\times10^{-2}$ - 1 $\times10^{-3}$ W. u.。这些结果进行了讨论的$α$ -集群结构，产生的状态与非自然的奇偶校验值，只要复合系统不能旋转集体，如预期的“$α$ + $^{208}$铅”的情况下。由于$α$ -核心距离的振荡运动的这种状态被首次观察到。
英文摘要：
Excited states in $^{212}$Po were populated by $α$ transfer using the $^{208}$Pb($^{18}$O, $^{14}$C) reaction and their deexcitation $γ$-rays were studied with the Euroball array. Several levels were found to decay by a unique E1 transition (E$_γ<$ 1 MeV) populating the yrast state with the same spin value. Their lifetimes were measured by the DSAM method. The values, found in the range [0.1-1.4] ps, lead to very enhanced transitions, B(E1) = 2$\times10^{-2}$ - 1$\times10^{-3}$ W.u.. These results are discussed in terms of an $α$-cluster structure which gives rise to states with non-natural parity values, provided that the composite system cannot rotate collectively, as expected in the '$α$ + $^{208}$Pb' case. Such states due to the oscillatory motion of the $α$-core distance are observed for the first time.
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