The Study of Nuclear Physics with Intermediate Energy Probes

中能探针核物理研究

• 批准号: 0072361
• 负责人: David Tedeschi
• 金额: $ 125万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0072361&HistoricalAwards=false
• 关键词: Study; Nuclear; Physics; Intermediate; Energy

0072361Whisnant The focus of the South Carolina Intermediate Energy Group is the study of nucleon and meson interactions using unpolarized and polarized photon beams. Our experimental photonuclear physics program is conducted at the Laser Electron Gamma Source (LEGS) located at Brookhaven National Laboratory and with the Large Acceptance Spectrometer (CLAS) at the Continuous Electron Beam Accelerator Facility (CEBAF) located at the Thomas Jefferson National Accelerator Facility (JLab). The proposed activities significantly impact three overlapping areas: the spin structure of the nucleon, the study of the nucleon-nucleon interaction, and meson production. Central to these investigations is the StronglyPolarized Hydrogen deuteride ICE (SPHICE) target. This novel polarized HD target permits measurement of asymmetries and, for the first time, absolute cross sections on the polarized proton, neutron, and deuteron. With SPHICE at LEGS, and at JLab (E94-117), a direct determination of the forward spin-polarizability and the Gerasimov-Drell-Hearn sum rule integrals for both the proton and neutron will be made. The photodisintegration of vector and tensor polarized deuterium at LEGS with linearly and circularly polarized photons will examine the nucleon-nucleon interaction in the region of the delta resonance in unprecedented detail. Our meson production program investigates the photon-nucleon and meson-nucleon interactions. From LEGS data we will be able to make the first model-independent determination of the pionphotoproduction multipoles. At JLab, phi meson production in the threshold region will be performed with unpolarized and linearly polarized (E98-109) photons. The photoproduction of vector mesons will be used to measure the mass of vector mesons embedded in nuclear matter by observing their dilepton decay (E94-002).

0072361 Whisnant南卡罗来纳州中能组的重点是使用非偏振和偏振光子束研究核子和介子的相互作用。我们的实验光核物理计划是在位于布鲁克海文国家实验室的激光电子伽马源（LEGS）和位于托马斯杰斐逊国家加速器设施（JLab）的连续电子束加速器设施（CEBAF）的大型接受光谱仪（CLAS）进行的。拟议的活动显着影响三个重叠的领域：核子的自旋结构，核子-核子相互作用的研究，介子的生产。这些研究的核心是强极化氘化氢ICE（SPHICE）目标。这种新型的极化HD目标允许测量的不对称性，并首次，绝对横截面上的极化质子，中子和氘核。利用LEGS和JLab（E94-117）的SPHICE，将直接确定质子和中子的前向自旋极化率和Gerasimov-Drell-Hearn求和规则积分。矢量和张量极化氘在LEGS与线性和圆偏振光子的光致衰变将检查在该地区的δ共振的核子核子相互作用在前所未有的细节。我们的介子产生计划研究了光子与核子和介子与核子的相互作用。从LEGS的数据，我们将能够作出第一个模型独立的测定pionphotoproduction多极。在JLab，将使用非偏振和线偏振（E98-109）光子在阈值区产生phi介子。矢量介子的光生将被用来通过观察它们的双轻子衰变来测量嵌入核物质中的矢量介子的质量（E94-002）。