利用不同出射粒子的平衡能量探测对称能密度依赖 - PowerPoint PPT Presentation

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利用不同出射粒子的平衡能量探测对称能密度依赖
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利用不同出射粒子的平衡能量探测对称能密度依赖

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  1. 第十四届全国核结构大会 利用不同出射粒子的平衡能量探测对称能密度依赖 报告人:王永佳 指导老师:李庆峰 湖州师范学院 2012.04 浙江 湖州

  2. 1 2 3 4 5 UrQMD transport model Nuclear symmetry energy Balance energy---depends on particle species Isospin dependence of balance energy Results Summary & Conclusion Outline

  3. Nuclear symmetry energy It is important in both nuclear physics and astrophysics. It is not well constrained right now. Super soft IBUU04: Z. Xiao et al. PRL102.062502 Moderately soft UrQMD: P.Russotto et al. PLB697.471 Super stiff LQMD: Zhao-Qing Feng Gen-Ming Jin PLB683.140

  4. What is balance energy?

  5. Why we study Balance energy? 70-80A MeV 50-60A MeV • Detector acceptance and reaction plane dispersion affect balance energy weakly. [Ref.] Deniel Joseph Magestro Ph.D Thesis (MSU 2000) • Balance energy depends on particle species, or not? • Old Experiment: not highly depends on particle species • Recent Experiment: depends on particle species [Ref.] EPJA 30. 31-46

  6. Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model • Soft-EoS with momentum dependence K=200MeV • Density and momentum dependent NN elastic cross section [Ref.] Qingfeng Li et al. PRC83.044617

  7. Calculations More than 500, 000 events for each case were calculated. [Ref.] Chenchen Guo et al. Sci China- Phys G: Mech Astron 55(2) 252-259

  8. Time evolution of baryon densities

  9. N/Z mass N/Z mass N/Z mass The inital N/Z and particle species dependent balance energy i. Balance energy increases with increasing N/Z. ii. Balance energy decreases with increasing mass.

  10. The influence of symmetry potential on balance energy of free neutrons is strongest of all.

  11. Banlance energy of free neutrons from HIC with isotopes.

  12. Reaction-plane contour plots for isospin asymmetry

  13. Reaction-plane contour plots for isospin asymmetry

  14. Reaction-plane contour plots for isospin asymmetry

  15. Summary & Conculsion • Balance energy of light particles emitted from mass symmetric HICs with isotopes, isobars and isotones has been studied. • The balance energy of free neutrons is sensitive to symmetry energy. • The balance energy of free neutrons from mass symmetric HICs with isotopes can be taken as a sensitive probe to complementary constrain symmetry energy.