Inverse kinematics Coulomb excitation of isovector quadrupole excitations of heavy nuclei for the investigation of the proton-neutron interaction in the valence space

重核等矢量四极激发的逆运动学库仑激发，用于研究价空间中的质子-中子相互作用

• 批准号: 33135603
• 负责人: Professor Dr. Norbert Andreas Pietralla
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/33135603?language=en
• 关键词: Inverse; kinematics; Coulomb; excitation; isovector

The proton-neutron degree of freedom and its role in the formation of collective quantum phenomena is one of the main interests of nuclear structure physics. Strong magnetic dipole (M1) transitions between nuclear excited states are a signature of their structural differences in terms of pn-symmetry. This project is dedicated to the identification of pn-non-symmetric quadrupole-collective states with quantum numbers Jpi = 2+. Their properties are sensitive to the pn-interaciton in the valence space. The levels of interest are populated by means of projectile-Coulomb excitation of heavy-ion beams delivered by the ATLAS accelerator at the Argnonne National Laboratory (ANL) on light-ion targets; their gamma decays are detected with the 4pi-gamma-spectrometer Gammasphere. Our approach to pn-non-symmetric 2+ states has proven very effective since it has been applied for the first time in an experiment in 2005. 14 subsequent experiments have been performed. Another seven experiments are planned to be performed within this project. We apply for funding for their execution and the data analysis. The results will contribute to an improved understanding of the deformation-dependence of vibrational excitations in heavy nuclei.

质子-中子自由度及其在集体量子现象形成中的作用是核结构物理的主要兴趣之一。核激发态之间的强磁偶极（M1）跃迁是它们在pn对称性方面结构差异的标志。本项目致力于识别量子数为Jpi = 2+的pn非对称四极集体态。它们的性质对价空间中的pn相互作用敏感。感兴趣的水平填充通过发射库仑激发的重离子束提供的ATLAS加速器在Argnonne国家实验室（ANL）的轻离子目标;他们的伽马衰变检测与4 π-γ-光谱仪γ射线。自从2005年首次在实验中应用以来，我们对pn非对称2+态的研究已经证明是非常有效的。进行了14次后续实验。计划在该项目内进行另外七项实验。我们为他们的执行和数据分析申请资金。这些结果将有助于更好地理解重核振动激发的形变依赖性。

项目成果

New Information on the Occurrence of the O(6) Symmetry in Nuclei

关于原子核中 O(6) 对称性出现的新信息

• DOI: 10.1051/epjconf/20159301002
• 发表时间: 2014
• 作者: N. Pietralla;T. Möller;C. J. Lister;E. A. McCutchan;G. Rainovski;C. Bauer;M.P. Carpenter;R. V. F. Janssens;D. Seweryniak;S. Zhu
• 通讯作者: S. Zhu