RUI : Shell Structure and Isospin Symmetry in Exotic Nuclei

这是一项招收乌尔西纳学院本科生进行实验核结构研究的项目。该项目是美国国家超导回旋加速器实验室（NSCL）和佛罗里达州立大学（FSU）正在进行的一项合作的一部分，涉及国家超导回旋加速器实验室的实验工作。所提出的工作将有助于理解质子和中子在稳定谷外的外来核中对下面集体态的贡献。质子和中子对核激发的贡献可以通过比较使用成对互补实验探针测量的跃迁强度来解开。放射性束技术的出现使得这种研究远离了通过逆运动学质子散射和库仑激发测量的稳定性。我们计划通过逆运动学质子散射来研究富中子外来核壳结构远离稳定性的持久性，并通过库仑激发测试质量A=50附近T=1同位旋多态的同位旋对称性。该项目的一个中心目标是保持一个活跃的研究项目在乌尔西纳斯学院校园的核结构。乌尔斯努斯学院是一所拥有1475名学生的国立文理学院，在科学方面有着悠久的历史。该项目将为学生提供在课外应用物理知识的机会，获得数据采集和分析的实用技能，观察和参与核加速器设施的运行，并向同事展示他们的工作成果。参与者将前往国家科学实验室进行实验和分析数据。他们将在乌尔西纳斯学院暑期研究员项目的一部分向乌尔西纳斯社区和美国物理学会/核物理学部会议上向核物理界展示他们的研究结果。

This is a project engaging Ursinus College undergraduates inexperimental nuclear structure research. The project is part of anongoing collaboration with colleagues at the National SuperconductingCyclotron Laboratory (NSCL) and Florida State University (FSU)involving experimental work at the NSCL. The proposed work willcontribute to the understanding of proton and neutron contributions tolow-lying collective states in exotic nuclei outside the valley ofstability. Proton and neutron contributions to nuclear excitations canbe disentangled by comparing transition strengths measured using pairsof complementary experimental probes. The advent of radioactive beamtechnology has enabled such investigations away from stability throughinverse-kinematics proton scattering and Coulomb excitationmeasurements. We plan to investigate the persistence of shellstructure away from stability in neutron-rich exotic nuclei viainverse-kinematics proton scattering and test isospin symmetry in T=1isospin multiplets near mass A=50 via Coulomb excitation.A central goal of the project is to maintain an active researchprogram in nuclear structure on the Ursinus College campus. UrsinusCollege is a national liberal arts college of about 1475 students witha long history of strength in the sciences. This project will providestudents opportunities to apply their knowledge of physics outside theclassroom, gain practical skills in data acquisition and analysis,observe and participate in the operation of a nuclear acceleratorfacility, and present their work to colleagues. Participants willtravel to the NSCL to perform experiments and analyze the data atUrsinus. They will present their results to the Ursinus community aspart of the Ursinus College Summer Fellows Program and to the nuclearphysics community at American Physical Society/Division of NuclearPhysics meetings.