核子诱导的χcJ抑制

本文主要运用夸克交换模型计算所得的核子— χcJ 离解截面研究Pb +Pb和S +Pb中心碰撞过程中强子物质中的 χcJ 抑制 .并定性地研究了核子动量和核子气温度对热平均截面地影响 .Pb +Pb和S +Pb中心碰撞中 χcJ 存活率表明核子与反核子所诱导的 χcJ 抑制是很明显的 .     

Cross sections for inelastic 2-to-2 meson-meson scattering in hadronic matter

With quark-antiquark annihilation and creation in the first Born approximation, we study the reactions:K■→K■~*,K■→K~*■, πK→πK~*, πK→ρK, ππ→ K■~*, ππ→K~*■,ππ→K~*■~*,πρ→K■, πρ→K~*■~*,ρρ→K~*■~*, K■~*→ρρ, and K~*■→pp. Unpolarized cross sections for the reactions are obtained from transition amplitudes that are composed of mesonic quark-antiquark relative-motion wave functions and the transition potential for quark-antiquark annihilation and creation. Using a quark-antiquark potential that is equivalent to the transition potential, we prove that the total spin of the two final mesons may not be equal to the total spin of the two initial mesons. Based on flavor matrix elements, cross sections for some isospin channels of reactions can be obtained from other isospin channels of the reactions. Remarkable temperature dependence of the cross sections was observed.     

Research on the ultrafast fluorescence property of thylakoid membranes of the wild-type and mutant rice

A high yielding rice variety mutant (Oryza sativa L., Zhenhui 249) with low chlorophyll b (Chl b) has been discovered in natural fields. It has a quality character controlled by a pair of recessive genes (nuclear gene). The partial loss of Chl b in content affects the efficiency of light harvest in a light harvest complex (LHC), thus producing the difference of the exciting energy transfer and the efficiency of photochemistry conversion between the mutant and wild-type rice in photosynthetic unit. The efficiency of utilizing light energy is higher in the mutant than that in the wild-type rice relatively. For further discussion of the above-mentioned difference and learning about the mechanism of the increase in the photochemical efficiency of the mutant, the pico-second resolution fluorescence spectrum measurement with delay-frame-scanning single photon counting technique is adopted. Thylakoid membranes of the mutant and the wild-type rice are excited by an Ar^+ laser with a pulse width of 120 ps, repetition rate of 4 MHz and wavelength of 514 nm. Compared with the time and spectrum property of exciting fluorescence, conclusions of those ultrafast dynamic experiments are: 1) The speeds of the exciting energy transferred in photo-system I are faster than that in photo-system II in both samples. 2) The speeds of the exciting energy transfer of mutant sample are faster than those of the wild-type. This might be one of the major reasons why the efficiency of photosynthesis is higher in mutant than that in the wild-type rice.     

Free quarks and antiquarks versus hadronic matter

Meson-meson reactions A(q₁q₁)+B(q₂q₂)→q₁+q₁+q₂+q₂ in high-temperature hadronic matter are found to produce an appreciable amount of quarks and antiquarks freely moving in hadronic matter and to establish a new mechanism for deconfinement of quarks and antiquarks in hadronic matter.     

Cross Sections for ππ←→ρρ and ππ←→ωω Reactions

To study chemical equilibrium of hadronic matter created in relativistic heavy ion collisions, phase shifts for the Ⅰ = 2ππ elastic scattering and cross sections for the Ⅰ= 2 and 0ππ←→ρρand Ⅰ=0ππ←→ωω reactions are calculated with the prior and post forms. While the post prior equivalence holds for the elastic scattering, the post-prior discrepancy of the inelastic scatterings relies on the spin-dependent terms of quark-antiquark potential.     

3到3的部分子弹性散射和早期热平衡化

研究了三胶子弹性散射ggg→ggg和三夸克弹性散射qqq→qqq. 证明了包含3→3弹性散射的输运方程的H定理. 输运方程给出了胶子物质热平衡化时间短和夸克物质热平衡化时间长的结果.     

核子诱导的XcJ抑制

本文主要运用夸克交换模型计算所得的核子—XcJ离解截面研究Pb Pb和S Pb中心碰撞过程中强子物质中的XcJ抑制．并定性地研究了核子动量和核子气温度对热平均截面地影响．Pb Pb和S Pb中心碰撞中XcJ存活率表明核子与反核子所诱导的XcJ抑制是很明显的．     

用手征夸克孤子模型计算氘的性质

两夸克间的单介子交换张量势的作用,使氘的基态混有³D₁态.用手征夸克禁闭孤子模型,计算了氘的³S₁+³D₁基态的性质.     

夸克胶子物质内的qq(q)→qq(q)反应

夸克胶子物质内的从夸克-夸克-反夸克到夸克-夸克-反夸克的散射过程会影响夸克物质和反夸克物质的热平衡化,其散射振幅是研究热平衡化的一个基础.依据微扰QCD理论,编制Fortran程序,推导了α4s阶的各个qq(q)→qq(q)散射费曼图的振幅平方和不同费曼图间的干涉项.     

Temperature-dependent cross sections for πφ and ρφ nonresonant reactions in hadronic matter

With a potential of which the large-distance part reflects lattice gauge results and of which the short-distance part is given by one gluon exchange plus perturbative one- and two-loop corrections, the Schrödinger equation brings about temperature dependence of meson masses and mesonic quark-antiquark relative-motion wave functions. The ground-state meson masses drop with increasing temperature. The transition amplitude calculated from the potential, the meson masses and the wave functions gives temperature-dependent cross sections for the five nonresonant reactions πφ→KK^* (or K^*K), πφ→K^*K^*,ρφ→KK,ρφ→KK^*(orK^*K) and ρφ→K^*K^*. The numerical temperature-dependent cross sections are parametrized. The peak cross section of either πφ→KK^* or πφ→K^*K^* increases from T=0 to T=0.75T_c and decreases with further increasing temperature. The cross section for ρφ→KK,ρφ→KK^* and ρφ→K^*K^* has a decreasing trend while the temperature increases from 0.75T_c.