RIBLL-1 能区放射性束弹性散 射研究 王建松中国科学院近代物理研究所

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 报告提纲 关于 RIBLL-1 的简单介绍 基于 RIBLL-1 的弹性散射研究 – 研究背景 – 实验及数据分析 – 结果讨论 小结

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang Current Main Exp. Setups at HIRFL-CSR CSRm CSRe SFC SSC SFC:  10 AMeV (A/q=2) SSC:  100 AMeV (A/q=2) CSRm:  1.0 AGeV (A/q=2) CSRe:  0.76 AGeV (A/q=2) HIRFL - CSR RIBLL 1ETF SHANS CSRe SHANS Spectrometer of Heavy Atoms & Nuclear Structure RIBLL 1 RIBs produced via PF & transfer with primary beams up to Kr ETF RIB Physics at intermediate energy EOS of asymmetric nuclaer matter High baryon density matter CSRe Mass measurement Decay spectroscopy Atomic physics with cooling storage ring

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang Radioactive Ion Beam Line at Lanzhou RIBLL Particle Identification by dE vs RF-T1 Low mass resolution High RIB intensity Particle Identification by dE vs T1-T2 High mass resolution Normal RIB intensity Also be used as a spectrometer

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 四种运行模式 高流强, 中分辨 –RI 束流在 T1 鉴别, 主要探测器放在 T1 靶室 中流强, 高分辨 –RI 束流在 T2 鉴别, 主要探测器放在 T2 靶室 高流强, 零度磁谱仪 –RI 束流在 T1 鉴别, 探测器分别放置在 T1 和 T2 气体产生靶，低能 RIBs

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 次级束流调试例子 9C9C 8B8B 7 Be 6 Li 11 C 10 C Elastic scattering Energy loss at wires of PPACs Beam Spot of 10 C at Target Position

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 利用 RF 信号鉴别次级束的例子

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang Low Energy RIBs Primary beam: high intensity beam from SFC Reaction mechanism: Transfer, charge exchange Characters of RIB: low energy, high intensity, close to stalbe nuclei. J.J He et al., Nuclear Instruments and Methods in Physics Research A 680 (2012) 43–47

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 基于 RIBLL-1 的弹性散射研究

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 研究背景

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 研究背景（续）

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 研究背景（续）

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 实验探测器设置 50cm 10cm 12cm 26° 13° 25cm PPAC1 PPAC2 Pb Telescope 1 Telescope 2 Primary beam: 600enA, 56MeV/u 12 C Production target: 9 Be Secondary Beams: 6 Li, 7 Be, 8 B Beam Intensity: ~800pps for 8 B and ~3000pps for 7 Be

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 弹散事件的鉴别 The Left Figure shows a typical particle identification spectrum. The secondary beams 8 B and the containments, 9 C, 7 Be and 6 Li are separated clearly in the figure. And also, the 8 B elastic scattering events were identified with the ΔE-E telescopes.

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 实验中 PPAC 的性能

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 数据分析过程 Y.Y.Yang, J.S.Wang et al. NIMA701(2013)1

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 如何得到正确的弹散角分布 Simulated Y(θ) Ruth Y(θ) Exp Because the secondary beams are dispersed widely, we have to simulate the Rutherford scattering events and compare with the experimental data to obtain the normalized differential cross section as the following: σ/σ Ruth (θ) = Y(θ) Exp / Y(θ) Sim Y(θ) Exp, Y(θ) Sim are the counts at a given angle θ from the experiment and the simulation, respectively. Y.Y.Yang, J.S.Wang et al. NIMA701(2013)1

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 系统观学模型势（ OMP ）计算 Y.Y.Yang, J.S.Wang et al., PRC87(2013)044613

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang CDCC 计算 Y.Y.Yang, J.S.Wang et al., PRC87(2013)044613

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 库仑破裂道对于 8 B 的弹散影响出人意料的小 Y.Y.Yang, J.S.Wang et al., PRC87(2013) B → 7 Be + p breakup have a small influence on the elastic scattering at three time of Coulomb barrier.

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 8 B and 11 Be 破裂道效应比较 : CCDC Calculations Calulated by D. Y. Pang

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 8 B 的库仑势和离心势 Calculated by D.Y.Pang

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 10 B, 10,11 C 的实验结果 The optical model calculations with a single-folding model with the Bruyeres Jeukenne-Lejeune-Mahaux (JLMB) model nucleon- nucleus potentials (seeing Y.P. Xu and D.Y. Pang, Phys. Rev. C87, (2013)) can reproduce the experimental angular distribution well. Y.Y.Yang, J. S. Wang et al. prepaired for PRC

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 从反应总截面提取的原子核物质半径

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 原子核半径对弹性散射角分布的敏感度 Could the nuclear radii be extracted from the ES angular distribution more precisely ?

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 弱束缚轻核的 1/4 角研究 Jin Lei, J. S. Wang et al., PRC85,057602

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 低能核反应系统总截面的唯像公式研究 Jin Lei, J. S. Wang et al., PRC86(2012)057603

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang 小结 在 RIBLL-1 上建立了一套测量弹性散射的实验方法 弹性散射虽然是一个基本的、貌似简单的核反应过程， 其物理内涵十分丰富 RIBLL-1 作为国内主要的放射性束流装置之一，在与 国内各兄弟科研单位的共同努力下，不断地改善条件、 挖掘潜力，更好地为大家服务

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang Collaborators Institute of Modern Physics, CAS, China –Yanyun Yang, Lei Jin, Qi Wang, Jianlong Han, Peng Ma, Shilun Jin, Junbing Ma, Zhen Bai, Meirong Huang, Qiang Hu, Jiangbo Chen ， R. Wada The Andrzej Sołtan Institute,Warsaw, Poland –N. Keeley, R. Rusek Beihang University –Danyang Pang M.S. University of Baroda, India – Surjit Mukhejee

Institute of Modern Physics, Chinese Academy of Sciences Elastic Scatering Studies at RIBLL ， J.S.Wang Thanks for your attention !