论文标题
同位素的及时延迟$γ$ -RARE光谱$^{119,121} $
Prompt-delayed $γ$-ray spectroscopy of neutron-rich $^{119,121}$In isotopes
论文作者
论文摘要
融合和转移引起的裂变反应$^{9} $ Be（$^{238} $ U，〜f），使用6.2 MEV/U光束能量，使用由AGATA，VAMOS ++和EXOGAM探测器组成的独特设置，用于在裂变过程中填充并研究中子$^$^{119,121 $ ISOPOP，并研究中子$^的$^$^$^$^{119,121} $ insope。此设置启用了同位素的提示删除的$γ$ -Ray光谱范围$ 100〜 \ rm {ns} -200〜μ \ rm {s} $。在同位素的奇数 - $ a $ a $^{119,121} $中，除了先前已知的$ 25/2^{+} $等异构状态外，还显示出短的半寿命$ 19/2^{ - } $同位素。此外，确定了$^{121} $ in $ 25/2^{+} $ isomer的新提示过渡以及重新评估其半衰期。将实验数据与在限制模型空间中大规模壳模计算的框架中获得的理论结果进行了比较。 $ \langleπg_{9/2}νH_{11/2}; i \ arrowvert \ hat {\ Mathcal {\ Mathcal {h}} \ arrowvertπg_{9/2}νh_{11/2}同位素中的中子富裕中基因中的$ b（e2）$过渡概率。 （i）减少$ e（29/2^{+}） - e（25/2^{+}）$ in odd-in（具有主构型$πg_{9/2}^{ - 1}νH_{ - 1}νh_{11/2}}^{ - 2}^{ - 2} $ and trient of $ 29/2^^} $} $E(27/2^{+}) - E(23/2^{+})$ in odd-Sb (with dominant configuration $πg_{7/2}^{+1}νh_{11/2}^{-2}$ and maximum aligned spin of $27/2^{+}$) with increasing neutron number could be understood as a consequence of hole-hole and particle-hole互动分别。
The fusion and transfer induced fission reaction $^{9}$Be($^{238}$U,~f) with 6.2 MeV/u beam energy, using a unique setup consisting of AGATA, VAMOS++ and EXOGAM detectors, was used to populate through the fission process and study the neutron-rich $^{119,121}$In isotopes. This setup enabled the prompt-delayed $γ$-ray spectroscopy of isotopes in the time range of $100~\rm{ns} - 200~μ\rm{s}$. In the odd-$A$ $^{119,121}$In isotopes, indications of a short half-life $19/2^{-}$ isomeric state, in addition to the previously known $25/2^{+}$ isomeric state, were observed from the present data. Further, new prompt transitions above the $25/2^{+}$ isomer in $^{121}$In were identified along with reevaluation of its half-life. The experimental data were compared with the theoretical results obtained in the framework of large-scale shell-model calculations in a restricted model space. The $\langle πg_{9/2} νh_{11/2};I \arrowvert \hat{\mathcal{H}}\arrowvert πg_{9/2} νh_{11/2};I\rangle$ two-body matrix elements of residual interaction were modified to explain the excitation energies and the $B(E2)$ transition probabilities in the neutron-rich In isotopes. The (i) decreasing trend of $E(29/2^{+}) - E(25/2^{+})$ in odd-In (with dominant configuration $πg_{9/2}^{-1}νh_{11/2}^{-2}$ and maximum aligned spin of $29/2^{+}$) and (ii) increasing trend of $E(27/2^{+}) - E(23/2^{+})$ in odd-Sb (with dominant configuration $πg_{7/2}^{+1}νh_{11/2}^{-2}$ and maximum aligned spin of $27/2^{+}$) with increasing neutron number could be understood as a consequence of hole-hole and particle-hole interactions, respectively.
