Bucher B, Zhu S, Wu C Y, Janssens R V F, Bernard R N, Robledo L M, Rodríguez T R, Cline D, Hayes A B, Ayangeakaa A D, Buckner M Q, Campbell C M, Carpenter M P, Clark J A, Crawford H L, David H M, Dickerson C, Harker J, Hoffman C R, Kay B P, Kondev F G, Lauritsen T, Macchiavelli A O, Pardo R C, Savard G, Seweryniak D, Vondrasek R
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Idaho National Laboratory, Idaho Falls, Idaho 83415, USA.
Phys Rev Lett. 2017 Apr 14;118(15):152504. doi: 10.1103/PhysRevLett.118.152504. Epub 2017 Apr 12.
Despite the more than 1 order of magnitude difference between the measured dipole moments in ^{144}Ba and ^{146}Ba, the octupole correlations in ^{146}Ba are found to be as strong as those in ^{144}Ba with a similarly large value of B(E3;3^{-}→0^{+}) determined as 48(+21-29) W.u. The new results not only establish unambiguously the presence of a region of octupole deformation centered on these neutron-rich Ba isotopes, but also manifest the dependence of the electric dipole moments on the occupancy of different neutron orbitals in nuclei with enhanced octupole strength, as revealed by fully microscopic calculations.
尽管在(^{144}Ba)和(^{146}Ba)中测量的偶极矩之间存在超过1个数量级的差异，但发现(^{146}Ba)中的八极关联与(^{144}Ba)中的一样强，其(B(E3;3^{-}→0^{+}))的类似大值确定为(48(+21 - 29))W.u.。新结果不仅明确地确定了以这些富中子钡同位素为中心的八极形变区域的存在，而且还表明了电偶极矩对具有增强八极强度的原子核中不同中子轨道占据情况的依赖性，这是通过完全微观计算揭示的。
