富中子 $^{144}$Ba 中八极形变的直接证据
核实验
2016-03-23 v1
摘要
富中子核 Ba (=11.5 s) 预计在质量数 小于200的核中展现出最强的八极关联之一。迄今，此类强关联间接证据由诸如增强的 跃迁以及基态带中交错的正负宇称能级等观测推断而来。在本实验中，八极强度通过亚势垒多步库仑激发直接测量：将后加速的650-MeV Ba 束流作用于 1.0-mg/cm Pb 靶。测得的矩阵元值 b 对应于约化 跃迁概率 48() W.u.。该结果代表了八极集体性的明确测定，大于任何可用的理论预测，且与八极形变一致。
引用
@article{arxiv.1602.01485,
title = {Direct Evidence of Octupole Deformation in Neutron-Rich $^{144}$Ba},
author = {B. Bucher and S. Zhu and C. Y. Wu and R. V. F. Janssens and D. Cline and A. B. Hayes and M. Albers and A. D. Ayangeakaa and P. A. Butler and C. M. Campbell and M. P. Carpenter and C. J. Chiara and J. A. Clark and H. L. Crawford and M. Cromaz and H. M. David and C. Dickerson and E. T. Gregor and J. Harker and C. R. Hoffman and B. P. Kay and F. G. Kondev and A. Korichi and T. Lauritsen and A. O. Macchiavelli and R. C. Pardo and A. Richard and M. A. Riley and G. Savard and M. Scheck and D. Seweryniak and M. K. Smith and R. Vondrasek and A. Wiens},
journal= {arXiv preprint arXiv:1602.01485},
year = {2016}
}
备注
5 pages, 2 figures, 1 table, Physical Review Letters 2016