Level structure in Fr-209
文献类型：期刊论文
| 作者 | Lei, XG ; Zhu, SF; Liu, ML; Zhou, XH; Guo, YX; Liu, Z; Zhang, YH; He, JJ; Zheng, Y; Luo, YX
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| 刊名 | HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
 |
| 出版日期 | 2001-08-01 |
| 卷号 | 25期号:8页码:725-730 |
| 关键词 | gamma-gamma-t coincidence isomer weak coupling |
| ISSN号 | 0254-3052 |
| 英文摘要 | The high-spin states of Fr-209 have been studied in the Au-197(O-16,4n)Fr-209 reaction at O-16 energies from 90 to 105 MeV using techniques of in-beam gamma -ray spectroscopy. Measurements of gamma -ray excitation functions, gamma-gamma -t coincidences and gamma -ray angular distributions were performed with 4 BGO(AC)HPGe detecters. A level scheme for Fr-209 with 21 gamma rays was established for the first time, including a high-spin isomer with a measured half-life of (52 +/- 20)ns. Comparing with the low-lying level structure in Rn-208, it may conclude that the low-lying levels in Fr-209 are formed by coupling the h(9/2) proton to the neutron hole excitations in Rn-208. Thus, negative parities could be assigned tentatively to the low-lying states. The nucleus Fr-209, with four valence neutron holes and five valence protons outside the closed-shell nucleus Pb-208, also presents a competition between neutron-hole excitations and proton excitations in its low-lying level spectrum. Additionally, it should be pointed out that the higher-lying level structure in Fr-209 does not follow the excitation pattern of Rn-208. We will pursue shell model calculations to interpret the level structure in Fr-209. |
| WOS关键词 | HIGH-SPIN STATES |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000170578100004 |
| 出版者 | SCIENCE PRESS |
| 公开日期 | 2010-10-29 |
| 源URL | [http://ir.imp.cas.cn/handle/113462/1457]  |
| 专题 | 近代物理研究所_近代物理研究所知识存储（2010之前） 近代物理研究所_实验物理中心 |
| 通讯作者 | Zhou, XH |
| 作者单位 | Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lei, XG,Zhu, SF,Liu, ML,et al. Level structure in Fr-209[J]. HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,2001,25(8):725-730. |
| APA | Lei, XG.,Zhu, SF.,Liu, ML.,Zhou, XH.,Guo, YX.,...&Luo, YX.(2001).Level structure in Fr-209.HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,25(8),725-730. |
| MLA | Lei, XG,et al."Level structure in Fr-209".HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION 25.8(2001):725-730. |
入库方式： OAI收割
来源：近代物理研究所
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