论文标题
$^{33} $ si的结构和z = 14的n = 20间隙的魔力
The Structure of $^{33}$Si and the magicity of the N=20 gap at Z=14
论文作者
论文摘要
$^{33} $ si的结构是通过$^{34} $ si beam在$^{9}上的98.5 meV/u的$^{34} $ si beam进行了研究的。使用Gretina $γ$ -Ray跟踪阵列检测到$^{33} $ SI后$^{33} $ SI后的及时$γ$ - 砂，而在NSCL（NSCL）的S800光谱仪（Nation Superconconting Cyclotancing Cyclotron Cyclotron Laboratory）的S800光谱仪的焦点中，以事件为基础确定了反应残留物。对于3/2 $^+$和1/2 $^+$状态的目前衍生的光谱因子值，$ C^2S $，对应于$ 0D_ {3/2} $中的中子删除，以及$ 1S_ {1/2} $ ORBITALS，shell Model Clucations and shell Model calculations and Shell Model Acculations and Complate and complate and complate and Coss and comm of to shell $ n = 20 $ n = 20 $ n = 20 $ n = 20 $ n = 20 $ n = 20 $ n = 20 $ n = 20。提出了由$ 0d_ {5/2} $轨道产生的三个状态，其中之一是约930 keV未绑定的。该实验的敏感性也证实了9/2 $^ - $和11/2 $ _ {1,2}^ - $最终状态的人口较弱，该状态源自高阶过程。这种机制也可能已经填充了一定程度的3/2 $^ - $和7/2 $^ - $ pary-parity状态，这阻碍了从正常无人列的$ 1P_ {3/2} $和$ 0F_ {7/2} $ ORBITS中淘汰的$ C^2S $值的确定。
The structure of $^{33}$Si was studied by a one-neutron knockout reaction from a $^{34}$Si beam at 98.5 MeV/u incident on a $^{9}$Be target. The prompt $γ$-rays following the de-excitation of $^{33}$Si were detected using the GRETINA $γ$-ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at NSCL (National Superconducting Cyclotron Laboratory). The presently derived spectroscopic factor values, $C^2S$, for the 3/2$^+$ and 1/2$^+$ states, corresponding to a neutron removal from the $0d_{3/2}$ and $1s_{1/2}$ orbitals, agree with shell model calculations and point to a strong $N=20$ shell closure. Three states arising from the more bound $0d_{5/2}$ orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of 9/2$^-$ and 11/2$_{1,2}^-$ final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the 3/2$^-$ and 7/2$^-$ negative-parity states, which hinders a determination of the $C^2S$ values for knockout from the normally unoccupied $1p_{3/2}$ and $0f_{7/2}$ orbits.
