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Meson Production in Heavy Ion Collisions at RHIC
meson production elliptic flow
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2009/10/29
We present meson production in Cu+Cu and Au+Au collisions measured by the STAR experiment at RHIC.The hadronic decay mode → K+K-is used in the analysis.The yields for meson in Cu+Cu and Au+Au ...
Study of Proton Resonances in 22Mg by Resonant Elastic Scattering of 21Na+p and Its Astrophysical Implication
nuclear astrophysics reaction rate nuclear structure and property
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2009/10/29
Proton resonant states in 22Mg have been investigated by the resonant elastic scattering of 21Na+p. The 21Na beam with a mean energy of 4.00 MeV/u was separated by the CNS radioactive ion beam separat...
Three and Fourbody Structure of Light Hypernuclei
hyperonnucleon interaction manybody structure
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2009/10/29
Hypernuclear physics has become very exciting owing to new epochmaking experimental data. Recent progress in theoretical andexperimental studies of hypernuclei and future developments in this field a...
A≈180质量区偶偶核形状相变研究
E-GOS曲线 晕带 形状相变
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2009/10/28
采用E-GOS方法对质子数在Z=72-78区的偶偶原子核170-184 Hf,170-184W,170-192Os和176-192Pt的集体运动模式和形状相变进行了研究.结果表明,170-184 Hf和170-184 W同位素核的低自旋态趋于SU(3)极限,176-192Pt和170-174Os同位素核是O(6)→U(5)的过渡核,并且基本上都存在角动量驱动的形状相变.
Ar 原子内嵌对C60 富勒烯碰撞的影响
Ar 内嵌富勒烯 碰撞 双富勒烯 分子动力学
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2009/10/28
基于半经验势的分子动力学模型, 研究了相同能量下 C60 +C60 与 Ar@C60 +Ar@C60 的对心碰撞后形成的富勒烯结构的不同。 发现在相同的能量下, Ar@C60 +Ar@C60 形成的碰撞产物的结构相比 C60 +C60 碰撞产物的结构有着明显的不同: 前者形成“花生”状的新富勒烯结构, 后者形成“哑铃”状的双富勒烯结构。
非对易空间中耦合谐振子的能级分裂
能级分裂 耦合谐振子 非对易空间
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2009/10/28
非对易空间效应的出现引起了物理学界的广泛兴趣。 介绍了非对易空间中量子力学的代数关系,在所考虑的空间变量的对易关系中包含了坐标坐标的非对易性, 并且把 Moyal-Weyl 乘法在非对易空间中通过一个Bopp变换转变成普通的乘法。 然后给出了非对易空间中耦合谐振子的能级分裂情况。
高压下钒的结构相变研究
结构 钒 高压
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2009/10/28
运用密度泛函理论研究了钒(Vanadium)在高压下的结构相变。 通过对体心立方(bcc)结构的钒在不同压强下剪切弹性系数C44的计算, 发现当压强约95 GPa时 C44<0, 说明体心立方结构的钒在此条件下是不稳定的。 进一步计算分析得到钒在高压下发生了从体心立方到菱面体 (Rhombohedral)的结构相变, 相变压强约70 GPa, 这一结果与最近的实验结果符合。 还首次发现当压强约38...
指出了研究夸克质量的重要性、 科学意义和夸克质量产生的机制。 用夸克传播子定义了夸克的质量, 进而讨论了夸克的有效质量。 最后指出了存在的问题和研究前景。
对夸克-介子耦合模型的研究进展及现状进行了简述.在此基础上,利用非拓扑孤子袋模型的思想和改进的夸克质量密度相关(IQMDD)模型,考虑夸克之间的排斥作用而加入ω介子,称为IQMDD-Ⅰ模型,得到了基态波函数和介子场满足的方程.利用平均场近似方法,通过得到的基态夸克波函数计算了核子的均方根半径和磁矩等可观测量,其结果与实验值吻合得较好.
星际26Al核合成的研究进展
超新星 WR星 AGB星
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2009/10/28
介绍了星际 26Al衰变所发射1 809 keV γ射线的最新空间探测结果, 综述了目前关于星际 26Al起源的各种天体模型的研究进展。最后, 简要阐述了14N(p,γ)15O反应截面的最新测量结果及其对 26Al起源研究的影响, 探讨了一种星际 26Al合成的可能新途径。
Structural evolution of the intruder band in 118Sn
intruder band quasiparticle alignment structural evolution
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2009/9/17
Excited states of the positive-parity intruder band in 118Sn have been studied via the 116Cd(7Li, 1p4n) reaction at 7Li energy of 48 MeV using techniques of in-beam γ-ray spectroscopy. This intruder b...
Study of various charged ρ-meson masses in asymmetric nuclear matter
asymmetric nuclear matter ρ-meson effective mass Dirac sea
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2009/9/17
We study the effective masses of ρ-mesons for different charged states in asymmetric nuclear matter (ANM) using the Quantum Hadrodynamics II model. The closed form analytical results are presented for...
Excess 3H in the volcanic lakes: evidence for natural nuclear fusion
3H(tritium) 3He natural nuclear fusion volcanic lakes
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2009/8/17
The excess 3H (tritium) have been observed in the volcanic lakes Nemrut (Turkey), Laacher (Germany) and Pavin (France). The 4He and 3He concentrations in Lakes Nemrut, Laacher, and Pavin were determi...
Structure study of light unbound nuclei near drip line
unbound nuclei nuclear structure resonant elastic scattering isobaric analog state
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2009/8/14
Some experimental techniques and theoretical analysis on unbound nuclei structure study are briefly introduced in this article. The unbound nuclei structure investigation can inspect the reliability o...
Structures of N=7 and N=8 isotones with l2 coupling
shell model l2 coupling level inversion
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2009/8/14
The structures of N=7 and N=8 isotones in Be-F mass range are investigated in the framework of the single-particle shell model. Different from the traditional potential terms, the l2 coupling is incl...