A lifetime measurement of excited states in ${}^{144}$Ce using the ${}^{142}$Ce(${}^{18}$O,${}^{16}$O) reaction with a beam energy of 67 MeV and the Recoil Distance Doppler-Shift (RDDS) method has been performed at the Cologne FN Tandem accelerator. Lifetimes of the three lowest yrast states in ${}^{144}$Ce have been measured as well as for the $3_1^{-}$ state and an effective lifetime of the $4_2^{+}$ state. Reduced $E2$ transition strengths determined using these results have been compared to predictions from recent shell-model calculations. From the interband transitions reduced $E1$ strengths could be determined, which are strongly enhanced.

中文翻译：

---

144Ce中激发态的终生测量：八极形变候选物中的增强E1强度

激发态的寿命测量 ${}^{144}$铈使用 ${}^{142}$铈（${}^{\mathrm{18岁}}$哦${}^{16}$O）在科隆FN串联加速器上以67 MeV的束能量进行了反应，并采用了后坐距离多普勒频移（RDDS）方法。美国三个最低拉斯特州的寿命${}^{144}$铈已被测量以及 $3_{\mathrm{1个}}^{-}$ 状态和有效寿命 $4_2^{+}$州。减少了$Ë2$使用这些结果确定的跃迁强度已与最近的壳模型计算得出的预测值进行了比较。从带间过渡减少$Ë\mathrm{1个}$ 可以确定优势，这些优势得到了极大的增强。