beat365"萃英"研究生學術沙龍第四期
beat365"萃英"研究生學術沙龍第四期
12月3日下午,“萃英”學術沙龍第四期在物理樓212與大家如期相約。核物理專業00級博士龍文輝同學帶來了題為“密度依賴的相對論Hartree-Fock理論”的精彩報告,并與與會同學分享了科研中酸甜苦辣。盡管天氣很冷,大家依然熱情未減,沙龍氣氛非常熱烈。
龍文輝博士師從孟傑教授,長期從事原子核理論方面的研究。他在報告中深入淺出地介紹了自己在博士期間的主要工作。他們在含密度依賴的介子-核子耦合的有效拉氏量中,通過量子化哈密頓量,建立了密度依賴的相對論Hartree-Fock近似理論(DDRHF)。在完成了相關理論公式的推導之後,建立了DDRHF近似對核物質以及球形原子核的相關計算程序。根據核物質和原子核的性質,調試給出了該理論的三組有效相互作用:PKO1、PKO2和PKO3。再利用這些相互作用系統研究了核物質與球形原子核的性質、有效質量的相關性質以及不同介子對核子-核子間相互作用的貢獻。
龍文輝博士在報告的過程中,也與同學們交流了自己的一些科研心得。從如何産生新的思想、如何有效地編寫和優化計算程序到研究課題的轉換、發表文章的挫折,都進行了廣泛的讨論,并回答了大家提出的問題。
“萃英”沙龍将邀請北大beat365的各個學科的優秀研究生代表與大家深入交流,歡迎同學們繼續關注并積極參與!
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"萃英"研究生學術沙龍第四期資料
主 講 人:龍文輝(理論核物理2000級直博)導 師:孟傑教授, Nguyen Van Giai教授研究方向:相對論Hartree-Fock理論及其應用報告題目:密度依賴的相對論Hartree-Fock理論沙龍時間:12月3日下午4:00沙龍地點:物理大樓中212龍文輝br/>科研簡曆:龍文輝,beat365官方网站理論核物理2000級直博生,已發表論文有:
Long Wenhui, Meng Jie, Nguyen Van Giai and Zhou Shan-Gui,New effective interactions in RMF theory with nonlinear terms and density-dependent meson-nucleon coupling.Physical Review C 69: 034319(2004)
Long Wenhui, Meng Jie, Zhou Shan-Gui,Structure of the new nuclide259Db and its α-decay daughter nuclei.Physical Review C 65: 047306 (2002)
Meng Jie, H. Toki, S. G. Zhou, S. Q. Zhang, Long Wenhui, L. S. Geng,Relativistic Continuum Hartree Bogoliubov theory for Ground State Properties of Exotic Nuclei.Progress in Particle and Nuclear Physics, accepted (2005)
Meng Jie, Ban Shufang, Li Jun, Long Wenhui, Lu Hongfeng, Shen Gang, Zhang Shuangquan, Zhang Shisheng, Zhang Wei, Zhou Shan-Gui,New effective interactions, new symmetry and new states in atomic nuclei.High Energy Physics and Nuclear Physics 28: 1291-1296(2004)
Meng Jie, Ban Shufang, Li Jun, Long Wenhui, Lu Hongfeng, Zhang Shuangquan, Zhang Wei, Zhou Shan-Gui,Relativistic description of exotic nuclei and nuclear matter at extreme conditions.Physics of Atomic Nuclei 67: 1619-1626 (2004)
Long Wenhui,Meng Jie,Zhou Shan-Gui,Study of259Db and its α-decay chain with RMF theory.Hign Energy Physics and Nuclear Physics 26: 823-830(2002)
報告摘要:在含密度依賴的介子-核子耦合的有效拉氏量中,通過量子化哈密頓量,建立了密度依賴的相對論Hartree-Fock近似理論(DDRHF)。Fock項的引入使得平均場不再是局域的,從而大大增加了數值計算的難度。在完成了相關理論公式的推導之後,建立了DDRHF近似對核物質以及球形原子核的相關計算程序。根據核物質和原子核的性質,調試給出了該理論的三組有效相互作用:包含σ-, ω-, ρ-和π-介子的PKO1和PKO3,包含σ-, ω-和ρ-介子的PKO2。利用PKO1、PKO2和PKO3:1)系統研究了核物質與球形原子核的性質,并與相關實驗數據以及RMF理論的計算結果比較,得到了令人滿意的結果;2) 系統研究了有效質量的相關性質,DDRHF近似給出了與實驗和Dirac-Brueckner Hartree-Fock計算結果一緻的有效質量的同位旋相關性;3) 探讨了不同的介子對核子-核子間相互作用的貢獻,在此基礎上給出了單π-介子交換的貢獻。In the effective Lagrangian with density-dependent meson-nucleon couplings, the Hartree-Fock approximation is obtained by quantizing the Hamiltonian, which is the Hartree-Fock extension of RMF theory with density-dependent meson-nucleon couplings. The contributions from pion meson can be studied within this frame. The Fock terms are nonlocal and hence increase the numerical difficulties. In this thesis, all the expressions of DDRHF approach are systematically derived (the details are given in the appendices) and the codes for the calculations of nuclear matter and spherical nuclei are constructed. By fitting the properties of nuclear matter and spherical nuclei, we obtained the effective interactions: PKO1 and PKO3 with σ-, ω-, ρ- and π- mesons, PKO2 σ-, ω- and ρ-mesons. With PKO1, PKO 2 and PKO 3, we studied the properties of nuclear matter and spherical nuclei in comparison with the corresponding experimental data and the results calculated with RMF theory, and obtained satisfactory descriptions of nuclear matter and spherical nuclei. The nucleon effective mass has been studied in detail, and we show that the DDRHF approach improves the description of the effective mass and its isospin dependence. The contributions from π-meson are discussed.