$^{89,90}$ Y中的壳体间隙降低水平密度
Shell-gap reduced level densities in $^{89,90}$Y
摘要：
利用来自$^{89}$ Y（$p,p' γ$）$^{89}$ Y和$^{89}$ Y（$d,p γ$）$^{90}$ Y反应的粒子- $γ$符合来获得作为激发能的函数的$γ$ -射线光谱.利用奥斯陆方法从粒子- $γ$符合矩阵中提取能级密度。的$N=50$壳封闭的能级密度的影响进行了讨论的组合准粒子模型的框架内。
英文摘要：
Particle-$γ$ coincidences from the $^{89}$Y($p,p' γ$)$^{89}$Y and $^{89}$Y($d,p γ$)$^{90}$Y reactions were utilized to obtain $γ$-ray spectra as function of excitation energy. The Oslo method was used to extract the level density from the particle-$γ$ coincidence matrices. The impact of the $N=50$ shell closure on the level densities is discussed within the framework of a combinatorial quasi-particle model.
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