论文标题
$^{186} $ tl的长寿状态的衰减研究
Decay studies of the long-lived states in $^{186}$Tl
论文作者
论文摘要
$^{186} $ tl中长期寿命状态的衰减光谱已在Cern Isolde的Isolde Decay Station进行。首次观察到$^{186} $ tl的$α$衰减，第一次观察到$^{186} $ tl，半衰期为$ 3.4^{+0.5} _ { - 0.4} $ s。基于$α$ -DECAY ENERGY，固定了长寿状态的相对位置，$（2^ - ）$状态为基础状态，$ 7^{（+）} $状态为77（56）〜KEV，$ 10^{（ - ）} $ State $ State $ State $ State $ state in 451（56）Kev。 $^{186} $ tl（$ 10^{（ - ）$）状态（$ t_ {1/2} = 3.40（9）$ s）的内部衰减的水平方案，仅通过排放374 kev $γ$ ray的过渡而延长了$ bugn-lim $ b $β$ 5，仅通过排放374 kev $γ$ ray thruged of decay $ bugn $ b.--d.--d. $ 9被确定。将$γ$衰减的$γ$衰减的延迟因子与邻近的奇数thallium同位素的可用数据进行了比较，这表明$πd_{3/2} $ shell在同组衰减中的重要性和$^{184} $^{184} $ tl and $ tl and $ tl and $ tl和$ tl and $ tl and} $ tl and $ tl和$ tl和$ tly的显着结构差异。
Decay spectroscopy of the long-lived states in $^{186}$Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The $α$ decay from the low-spin $(2^-)$ state in $^{186}$Tl was observed for the first time and a half-life of $3.4^{+0.5}_{-0.4}$ s was determined. Based on the $α$-decay energy, the relative positions of the long-lived states were fixed, with the $(2^-)$ state as the ground state, the $7^{(+)}$ state at 77(56)~keV and the $10^{(-)}$ state at 451(56) keV. The level scheme of the internal decay of the $^{186}$Tl($10^{(-)}$) state ($T_{1/2} = 3.40(9)$ s), which was known to decay solely through emission of 374 keV $γ$-ray transition, was extended and a lower-limit for the $β$-decay branching $b_β> 5.9(3)\%$ was determined. The extracted retardation factors for the $γ$ decay of the $10^{(-)}$ state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the $πd_{3/2}$ shell in the isomeric decay and significant structure differences between $^{184}$Tl and $^{186}$Tl.
