论文标题
集体2p-2h入侵者在$^{118} $ sn中通过$β$ -decay $^{118} $使用Griffin研究
Collective 2p-2h intruder states in $^{118}$Sn studied via $β$-decay of $^{118}$In using GRIFFIN
论文作者
论文摘要
半魔法$^{118} $ sn的低洼结构已通过$β$ -DECAY（$^{118} $ in（$ t_ {1/2} = 4.45 $ min），通过2p-2H Proton Incorder band的状态降低的状态过渡概率来研究形状共存。这项高统计研究是在Triumf-ISAC的Griffin光谱仪进行的。总共将99个转变放在水平方案中，新观察到43个。已经解决了三个低空的$γ$ - 射线过渡，其能量接近285 kev已得到解决，从中2 $^+_ {\ mathrm {\ mathrm {inter。}} \ rightArrow 0^+_ {\ mathrm {intrm {intrm {intrm {intrm {inter。}} $ 284.52-Kev Triverition确定了以前的分支机构的一半。 $ b（e2; 2^+_ 2 \ rightarrow 0^+_ 2）$ 21（4）W.U.与39（7）W.U.相比从先前的测量。还已经进行了使用$ SD $ IBM-2进行混合的计算，以将实验$ b（E2）$值与理论值进行比较，并与先前使用相同理论模型研究的$^{114,116} $ SN同位素进行比较。
The low-lying structure of semi-magic $^{118}$Sn has been investigated through the $β$-decay of $^{118}$In ($T_{1/2}=4.45$ min) to study shape coexistence via the reduced transition probabilities of states in the 2p-2h proton intruder band. This high-statistics study was carried out at TRIUMF-ISAC with the GRIFFIN spectrometer. In total, 99 transitions have been placed in the level scheme with 43 being newly observed. Three low-lying $γ$-ray transitions with energies near 285 keV have been resolved from which the 2$^+_{\mathrm{intr.}} \rightarrow 0^+_{\mathrm{intr.}}$ 284.52-keV transition was determined to have half of the previous branching fraction leading to a $B(E2;2^+_2\rightarrow 0^+_2)$ of 21(4) W.u. compared to 39(7) W.u. from the previous measurement. Calculations using $sd$ IBM-2 with mixing have also been made to compare the experimental $B(E2)$ values to the theoretical values and to make comparisons to the $^{114,116}$Sn isotopes previously studied using the same theoretical model.
