中高能(p,d)反应理论研究

The tensor forces play an important role in atomic nuclei and the investigation of their effects in nuclear structures is one of the hotest topics in recent nuclear physics studies. The theoretical studies in nuclear structure show that tensor forces can enhance the high-momentum components of nuclear wave functions around 2 fm^-1 and beyond, which could be probed by (p,d) reactions with high-momentum transfer. Recently, experimentalists have proposed to measure the high-momentum components of neutron wave functions in atomic nuclei by conducting (p,d) reactions using the CSRm and RIBLL2 facilities at IMP, Lanzhou, with proton beam energies ranging from 400 to 1600 MeV, in hope of obtaining direct evidences of tensor force effects. We propose to make theoretical studies for these intermediate- to high-energy (p,d) reactions, which will include studies on 1) the (p,d) reaction mechanisms at intermediate- and high-energies, 2) formalism with relativistic kinematics and dynamics for (p,d) reactions, 3) microscopic nucleon-nucleus optical model potentials for energies ranging from several hundred MeV to GeV, and 4) momentum distributions of nucleon wave functions in nuclei and their high-momentum components. We will explore relevant theoretical models and make the corresponding numerical codes for the proposed studies. This work is indispensable for experimental studies of tensor force effects with the (p,d) reaction method. Direct measurement and theoretical analysis of the tensor force effects will help us to understand this important part of nucleon-nucleon interactions and will be important to help to establish new nuclear structure theories that include tensor forces explicitly.

张量力在原子核中的效应是当前核物理研究的热点之一。核结构模型计算表明张量力将造成原子核中核子波函数在2 fm^-1附近的高动量成分显著增强。近年来实验核物理学家提出利用中高能(p,d)反应来研究原子核中核子波函数的高动量成分，进而检验张量力效应。本项目拟开展中高能(p,d)反应理论研究，为上述实验工作提供可靠的理论支持。理论上要解决的问题包括：研究中高能条件下(p,d)反应机制、相对论运动学和动力学的处理以及几百 MeV 到 1 GeV 能区的核子-核和氘核的微观光学势，核内核子波函数的动量分布和高动量成分。本项目将开展相关理论模型的建立及数值程序的编写与检验。对于张量力效应的直接测量和理论分析将促进核物理对张量力性质的深入了解，对于建立新的包含张量力的核结构理论研究具有重要的科学意义。

在本项目的资助下，围绕中高能(p,d)反应理论，我们主要开展了如下工作1）(d,p)和(p,d)反应的新理论和方法研究，包括超出绝热近似的(d,p)/(p,d)反应理论（Weinberg State expansion 方法和CDCC方法）以及面积分方法等；2）耦合道模型理论，包括破裂反应道引起的氘核、6Li、8Be等核的破裂反应道引起的动力学极化势的系统学行为、系统研究了破裂反应道对放射性核如8B、10B、11Be、9-11C等弹性散射截面的耦合效应；3）研究直接核反应理论计算所需要的3He和氘核在1p-壳核上的系统学光学势以及核-核系统学光学势。我们在这些方向上取得了一系列有意义的成果，并为后续理论的发展打下了很好的基础。项目执行顺利、取得了丰富的研究成果，发表22篇SCI论文，其中包括PRC 15篇，CPL、CPC等 7篇；3次国际会议报告。

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