Isospin Symmetry and Core Polarization in Z=8 and N=8 Single Closed Shell Nuclei

该项目涉及厄勒姆学院的本科生在研究质子和中子的行为在异国情调的核差异。质子和中子对激发态的贡献可以通过比较对质子和中子具有不同灵敏度的实验测量来解开。放射性束技术的出现使得通过逆运动学质子散射、电磁寿命测量和库仑激发来研究远离稳定性的原子核成为可能。本项目的重点是N=8和Z=8单闭壳层核的集体激发。计划进行三次测量，一次是在佛罗里达州立大学（FSU）进行的Ne-18第一激发态的伽马射线寿命测量，另一次是在国家超导回旋加速器实验室（NSCL）进行的氖-18和氧-22第一激发态的逆运动学质子散射测量。该项目将持续三年，每年夏天有一到两名学生参加8 -10周的课程。参与者将前往NSCL或FSU进行实验，并将在厄勒姆分析数据。

This project involves Earlham College undergraduates in the study ofdifferences in proton and neutron behavior in exotic nuclei. Protonand neutron contributions to excited states can be disentangled bycomparing experimental measurements that have differentsensitivities to protons and neutrons. The advent of radioactivebeam technology has enabled such investigations of nuclei away fromstability via inverse kinematics proton scattering, electromagneticlifetime measurements, and Coulomb excitation. The focus of thisproject is on collective excitations in N=8 and Z=8 single closedshell nuclei. Three measurements are planned, a gamma-ray lifetimemeasurement of the first excited state of Ne-18 at Florida StateUniversity (FSU) and inverse kinematics proton scatteringmeasurements of the first excited states of Neon-18 and Oxygen-22 atthe National Superconducting Cyclotron Laboratory (NSCL). Theproject will span three years and involve one to two students for8-10 weeks per summer. Participants will to travel to the NSCL orFSU to perform experiments and will analyze the data at Earlham.