放射性$^{222} $ ra和$^{228} $ ra beams的库仑激发辐射核中八振形变形的演变

论文标题

放射性$^{222} $ ra和$^{228} $ ra beams的库仑激发辐射核中八振形变形的演变

Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}$Ra and $^{228}$Ra Beams

论文作者

Butler, P. A., Gaffney, L. P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., De Angelis, G., De Witte, H., Garrett, P. E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D. T., Keatings, J. M., Kelly, N. A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Singh, B. S. Nara, O'Donnell, D., Ojala, J., Page, R. D., Pedersen, L. G., Raison, C., Reiter, P., Rodriguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T. M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielińska, M.

论文摘要

有稀疏的直接实验证据表明，原子核可以表现出稳定的八极相关性引起的稳定梨形。为了研究镭同位素中八振长的性质，已经确定了$^{222,228} $ ra nuclei nuclei的电动元素矩阵元素（$ e3 $）矩阵元素，使用了子轰炸，多步coolomb激发。放射性镭的光束由CERN的Hie-Isolde设施提供。通过将$^{222} $ ra描述为具有稳定的Octupole变形的梨形，而$^{228} $ ra的观察到不同核转换的$ 3矩阵元素的观察到的模式可以解释。

There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of $E$3 matrix elements for different nuclear transitions is explained by describing $^{222}$Ra as pear-shaped with stable octupole deformation, while $^{228}$Ra behaves like an octupole vibrator.

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