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合作单位 北大、华师、近物所 科大、上海 所、兰大、山大

第十四届全国核结构大会 2012.4.12-16 ，湖州， 浙江. HIRFL-CSR 上低温高密核物质性质 研究计划 肖志刚 1 For CEE pre-Collaboration 1 清华大学物理系. 合作单位 北大、华师、近物所 科大、上海 所、兰大、山大. 内容  物理背景  CEE 的概念性设计  现状与计划  小结. 早期宇宙. T(MeV). LHC. Q G P. RHIC. SPS. 100. AGS. 强子气体. SIS. CSR. 10. 气态. 液态. 中子星.  B GeV. 0.2.

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合作单位 北大、华师、近物所 科大、上海 所、兰大、山大

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  1. 第十四届全国核结构大会 2012.4.12-16，湖州， 浙江 HIRFL-CSR上低温高密核物质性质研究计划肖志刚1For CEE pre-Collaboration1 清华大学物理系 合作单位北大、华师、近物所科大、上海所、兰大、山大

  2. 内容 •  物理背景 •  CEE的概念性设计 •  现状与计划 •  小结

  3. 早期宇宙 T(MeV) LHC Q G P RHIC SPS 100 AGS 强子气体 SIS CSR 10 气态 液态 中子星 B GeV 0.2 0.4 0.6 0.8 1.0 1.2 1.4 核物质相图 • 核物质性质研究的关键性问题: • 寻找具有参加子自由度的物质形态 • 理解夸克物质、强子物质与核物质的不同性质 • 理解上述三种物质状态之间的相变过程

  4. :Compressibility Esym Symmetry Energy: Energy cost to convert protons to neutrons in nuclear medium E  (N-Z)

  5. A rather soft nuclear symmetry energy is more favored by FOPI data!!! Z.G. Xiao, B.A. Li et al., Phys. Rev. Lett. 102 (2009) 062502 Revisit FOPI -/+ data with IBUU04 IBUU04: Measurement at sub GeV/u energy range helps to resolve the Esym()!

  6. What will be new ? I Well studied： Mass resolved phase space well covered at midrapidity with FOPI, yielding lots of physical outputs What is missing is the forward region, particularly for the isospin sector in EOS study. This is what CEE will focus on! 1 Esym via -/+, and 3He/t

  7. What will be new ? I • Advantages of pion observables at HIRFL-CSR: • Density as high as 2~30 , varying rapidly with beam energy; • Maximum stopping, maximum sensitivity on the EOS • NOT influenced by the problem of clustering in transport • Most copious produced, copious information of isospin effect; • …… F. Fu, XZG et al., PLB666(2008)359

  8. What will be new ? I Sensitivity：S= (-/+ )x=1 /(-/+ )x=0 Degree of IF： (-/+ )tran－ (-/+ )isob Nuclear Stopping Power is maximized at HIRFL-CSR region, resulting in best sensitivity of the physical observable on the EOS of cold dense nuclear matter.

  9. What will be new ? II Well studied： Mass resolved phase space well covered at midrapidity with FOPI, yielding lots of physical outputs What is missing is the forward region, particularly for the isospin sector in EOS study. This is what CEE will focus on! 1 Esym via -/+, and 3He/t

  10. What will be new ? II Well studied： Mass resolved phase space well covered at midrapidity, yielding lots of physical outputs What is missing is the forward region, particularly for the isospin sector in EOS study. This is what CEE will focus on! 1 Esym via -/+, and 3He/t

  11. (a) (b) Vb T P N/Z N/Z y y What will be new ? II 2 Isospin Tracing Ru+Ru (more proton) Zr+Ru Ru+Zr Zr+Zr (less proton) Y(0)=Y/Ycm-1

  12. 内容 •  物理背景 •  CEE的概念性设计 •  现状与计划 •  小结

  13. N SFC:  10 AMeV (H.I.),17~35 MeV (p) SSC: 100 AMeV (H.I.), 110 MeV (p) CSRm: 1000 AMeV (H.I.), 2.8 GeV (p) SSC SFC CSRe RIBLL2 RIBLL1 CSRm RIBLL1: RIBs at tensof AMeV RIBLL2: RIBs at hundreds of A MeV CSRe: storage ring with deceleration To Make use of HIRFL-CSR heavy ion beams

  14. Dipole MWDC MRPC ZDC T0 Target STA CEE 概念性设计

  15. Dipole MWDC MRPC ZDC T0 Target STA • CEE •  磁铁 •  MWDC •  硅像素和硅微条探测器 •  ZDC •  TOF （T0，iTOF和MRPC） •  FEE/DAQ 合作单位北大、华师、近物所科大、上海所、兰大、山大 • 2011年7月25日，第一次 Pre-CEE meeting • 2012年2月7日， 第二次 Pre-CEE meeting

  16. 内容 •  物理背景 •  CEE的概念性设计 •  现状与计划 •  小结

  17. (Test Beam) • C+C @ 200,600 MeV/u • Three MWPC tracking • 12 TOF Strips + Start • 1 Neutron Wall • Inclusive • B~0.4T，reversible Target

  18. Outcome of the test beam run 12C+12C 600AMeV + P - 1) Tracks reconstructed well 2) Pion ratio ~ 1 in C+C 3) Limited electronics, detector resolution and Heavy background … 4) Systematic error not controlled Full simulation and preparation for further experiment ongoing.

  19. Phase I TOF Wall Neutron Wall MWDC Target START Dipole

  20. MWDC R&D Position Resolution: ＝200 ~ 260m MIPEfficiency 95% ~ 97%， Max. Rate : 104 HZ/wire

  21. 径迹探测器读出测试（I） PreAMP FLADC Sense Wire X丝 延迟 300ns U丝 延迟 600ns V丝

  22. 谢 谢

  23. 小结 • 1GeV/u 以下的重离子碰撞，是研究核物质状态方程的理想手段。冷致密核物质，可以在这一能区形成。 • 提出了CEE的概念性设计，各个工作小组正在致力于完善各个子系统的设计和方案。 期待大家的关注和支持！ Thank you !

  24. FEE 和 DAQ 构架

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