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LIFETIMES OF TWO-PHONON 1(-) STATES IN EVEN N=82 NUCLEI

机译:N = 82核中两个声子1(-)态的寿命

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摘要

Photon scattering experiments on the semi magic nuclei Ba-138 and Ce-140 have been performed at the bremsstrahlung facility of the Stuttgart Dynamitron. Two-phonon 1(-) states were excited at 4.026 and 3.643 MeV excitation energy respectively as well as a number of 2(+) states between 2 and 4 MeV. Lifetimes and upper limits for the decay to other low-lying states were extracted from the data and are compared to lifetimes given in the literature. The systematics of B(E1) values and energies of the 1(-) two-phonon states is analysed using additional data from previously published (gamma,gamma') experiments on the neighbouring isotones Nd-142 and Sm-144. [References: 29]
机译:已经在斯图加特动态电子的stra致辐射装置上对半魔核Ba-138和Ce-140进行了光子散射实验。两声子1(-)态分别在4.026和3.643 MeV激发能下激发,以及2和4 MeV之间的2(+)态激发。从数据中提取出衰落到其他低洼状态的寿命和上限,并将其与文献中给出的寿命进行比较。使用先前发表的关于相邻同构物Nd-142和Sm-144的(gamma,gamma')实验的其他数据来分析1(-)两声子态的B(E1)值和能量的系统学。 [参考:29]

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