论文标题
$ n = z $ doubly-magic $^{56} $ ni的签名
Signature of a possible $α$-cluster state in $N=Z$ doubly-magic $^{56}$Ni
论文作者
论文摘要
在不稳定的$ n = z $上进行的无弹性$α$ - 散发实验，双重魔术$^{56} $ ni核是在Ganil的50 A.Mev的Inverse Kinematics中进行的。在实验设置的有限相位空间内观察到$α$ - 粒子发射的高多重性。该观察结果无法通过统计 - 末期模型来解释。理想的经典气体模型$ kt $ = 0.4 meV可以很好地重现实验动量分布，并且观察到的$α$颗粒的多重性对应于96 MeV左右的激发能。如果我们假设$^{56} $ ni中的$α$ -GAS状态的分布式$Mα$ -Decay集合的方法与实验结果一致。这些结果表明，可能存在一个异国情调的状态，该状态由许多$α$粒子组成，激发能量为$ 113^{+15} _ { - 17} $ MEV。
An inelastic $α$-scattering experiment on the unstable $N=Z$, doubly-magic $^{56}$Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for $α$-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay model. The ideal classical gas model at $kT$ = 0.4 MeV reproduces fairly well the experimental momentum distribution and the observed multiplicity of $α$ particles corresponds to an excitation energy around 96 MeV. The method of distributed $mα$-decay ensembles is in agreement with the experimental results if we assume that the $α$-gas state in $^{56}$Ni exists at around $113^{+15}_{-17}$ MeV. These results suggest that there may exist an exotic state consisting of many $α$ particles at the excitation energy of $113^{+15}_{-17}$ MeV.
