Nuclear Structure At High Spin

高自旋的核结构

• 批准号: 9319934
• 负责人: Juerg Saladin
• 金额: $ 59.68万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9319934&HistoricalAwards=false
• 关键词: Nuclear; Structure; Spin

9319934 Saladin Several experimental investigations on the behavior of nuclei at high angular velocity (i.e. high spin) are proposed. The interest in such studies lies in the fact that, as the angular velocity of a nucleus is increased, its internal structure changes due to the influence of the coriolis and centrifugal interaction. The proposed experimental program will be carried out with the Pitt array at Notre Dame, the Pitt-FSU array at FSU and at Gammasphere. In the A=70 to 80 region a search for theoretically predicted superdeformed bands is proposed. It is furthermore proposed to study odd A nuclei in the A=70 to 90 region and in particular the odd-odd nucleus Br- 78. A series of lifetime studies on Ac-219 by means of DSAM and the plunger method are proposed. A series of experiments are proposed. which are based on conversion electron spectroscopy which can provide crucial information on the multipolarity of transitions. Specifically it is proposed to study the origin of "surplus" electrons that were observed by the Pitt group in Ce- 130. Experiments are planned in neighboring nuclei in the A=130 nuclei and for different target and projectile combinations. It is furthermore proposed to confirm the M1-character of the recently found so-called M1-bands in the light Hg and Pb region.

9319934 Saladin提出了几项关于高角速度(即高自旋)下原子核行为的实验研究。这类研究的兴趣在于，当原子核的角速度增加时，由于科里奥利相互作用和离心力的影响，其内部结构会发生变化。拟议的实验方案将在巴黎圣母院的PITT阵列、FSU的PITT-FSU阵列和Gammasphere进行。在A=70-80范围内，提出了寻找理论预测的超形变带的方法。此外，还建议研究A=70-90区的奇A核，特别是奇A核BR-78。利用DSAM和柱塞法对AC-219进行了一系列寿命研究。提出了一系列的实验方案。它们基于转换电子能谱，可以提供有关跃迁多极性的关键信息。具体地说，有人建议研究PITT小组在Ce-130中观察到的“过剩”电子的来源。计划在A=130的邻近原子核中进行实验，并针对不同的目标和射弹组合进行实验。此外，还建议确认最近在轻汞和轻铅区发现的所谓的M1带的M1特征。