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假定11Li,14Be和17B是由N=2Z核芯和两个外层中子组成的三体系统,核芯-中子和中子-中子间的作用为弱吸引指数势,不足以形成核芯-中子和中子-中子二体束缚态.本文的计算表明,核芯-中子-中子三体系统可形成束缚态,计算结果基本上解释了11Li,14Be,17B的基态能量和异常大核半径的实验结果. 相似文献
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着重研究受到非弹性碰撞相互作用,即考虑有三体复合耗散和原子填充时三势阱中玻色-爱因斯坦凝聚体的动力学性质.运用三模近似,得到三个耦合的GP方程,用数值的方法得到不同散射长度的数值结果,展示了玻色-爱因斯坦凝聚体在零相位和π相位时,会出现自俘获及量子隧穿现象,且定态解的稳定性与相位有关. 相似文献
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用α-α-Λ三集团模型和谐振子乘积态为基的展开方法,计算了9Be直到15MeV激发能的能谱.通过计算Lπ=0+,2+,1-三个态的形状密度,确定了9Be处于上述三个态时的几何结构.并根据能谱的耦合特征和几何结构对能谱进行了K分类. 相似文献
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在三体模型的基础上,采用汤川作用势,进行变分计算,进一步研究了晕核11Li,14Be和17B的基态性质,给出了晕中子密度分布的一个解析表达式.理论计算结果与最新的实验数据一致. 相似文献
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本文研究了基于一个带有多体相互作用(XZY-YZX型和XZX+YZY型)的三比特XXX海森堡自旋链模型的量子隐形传态. 首先求出该模型的本征值和本征态, 然后再以它在热平衡态下的纠缠为量子信道进行隐形传态并求出保真度的表达式. 分别分析了不带三体相互作用和仅带一种三体相互作用及同时带两种三体相互作用的XXX模型的保真度与外磁场和温度的关系, 得知仅带有XZX+YZY型三体相互作用的铁磁质海森堡XXX模型的隐形传态质量最好, 并且工作时需要的外界磁场最小、 温度相对较高, 在实验上容易实现. 相似文献
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本文研究了基于一个带有多体相互作用(XZY-YZX型和XZX+YZY型)的三比特XXX海森堡自旋链模型的量子隐形传态. 首先求出该模型的本征值和本征态, 然后再以它在热平衡态下的纠缠为量子信道进行隐形传态并求出保真度的表达式. 分别分析了不带三体相互作用和仅带一种三体相互作用及同时带两种三体相互作用的XXX模型的保真度与外磁场和温度的关系, 得知仅带有XZX+YZY型三体相互作用的铁磁质海森堡XXX模型的隐形传态质量最好, 并且工作时需要的外界磁场最小、 温度相对较高, 在实验上容易实现. 相似文献
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在具有非线性自相互作用gΦ4的可重正化标量场论中,本文研究了一类新的非拓扑孤子.耦合常数g有一个临界值gcrit,当g>gcrit时,不存在稳定的非拓扑孤子. 相似文献
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Although it has been verified that the interacting boson model (IBM) can be applied to light nuclei in sd shell successfully, the deficiency shll exists. The level of experimental spectrum of 24Mg is much higher than 3. The similar result can not be obtained by using of conventional IBM, in which only one-body and two-body interactions are concerned. Three-body interactions have been discussed by some authors, but the authers mainly considered the diagonal interactions. Moreover,the defect mentioned above can not be solved with these interactions. Introducing three-body non-diagonal interaction, the energy levels of 24Mg are calculated, the difficulty of low 0 theoretical level is overcome and the coincidence betWeen theory and experiment is improved. This work illustrates that in some cases the three-body non-diagonal boson interaction is important. 相似文献
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We have investigated the low-lying collective states and electromagnetic transitions in 94Mo within the framework of the interacting boson model. The influence of model parameters on the energy levels and electromagnetic properties has been investigated. The analysis of the obtained results and the parameter values predict that the 23+state is the lowest mixed symmetry state with pure F = Fmax - 1 in this nucleus. The calculated results predicate that the 25+ (two-Q-phonon) mixed symmetry state is closed to the J = 2+ at 2.870 MeV in the experimental data, and the 2.965 MeV state is the lowest mixed symmetry with J = 3+. 相似文献
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An effective action for Bose-Hubbard model with two-and three-body on-site interaction in a square optical lattice is derived in the frame of a strong-coupling approach developed by Sengupta and Dupuis.From this effective action,superfluid-Mott insulator(MI) phase transition,excitation spectrum and momentum distribution for two phases are calculated by taking into account Gaussian fluctuation about the saddle-point approximation.In addition the effects of three-body interaction are also discussed. 相似文献
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三体势对含f玻色子的IBM1的O(6)极限能谱修正 总被引:1,自引:0,他引:1
在s–dIBM1的O(6)极限下,引入d玻色子之间相互作用的等效三体势,考虑f玻色子产生的八极态,导出了正负宇称态能谱解析表达式,并对过渡区偶偶核118Xe、120Xe进行了能谱计算,得到了与实验能谱符合更好的结果,然后用Staggering指数定量分析了正负宇称态能谱中的Staggering现象. 相似文献
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LIOTTA R J 《中国科学:物理学 力学 天文学(英文版)》2011,(Z1)
Using a cluster model based on the Woods-Saxon potential, alpha-particle decays from excited states in 24Mg have been system atically investigated. Calculations can in general reproduce experimental data, noticing the fact that the preformation factor P of alpha particle in alpha-decaying nuclei is of order from 100 to 10?2. This can be the evidence for the α+20Ne structure in 24Mg. Meanwhile, the results also show the existence of other configurations, such as 16O+2α. Since the calculated decay widths are ... 相似文献
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在p+58Ni反应的理论计算中考虑了集体态和转移反应机制,利用大型程序MEND计算了Ein≤200MeV能区6种轻粒子(n,p,α,d,t及3He)出射的能谱和双微分截面。计算结果与实验数据基本一致;与以前的工作相比,解释了能谱和双微分截面中出现的尖峰,并减小了单粒子态密度修正因子ccg1(v)。 相似文献
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The extended interacting boson model with s-, p-, d-, f- and g-bosons included (spdfg IBM)is investigated. The algebraic structure including the generators, the Casimir operators of the groups at the SU(5) dynamical symmetry and the branching rules of the irreducible representation reductions along the group chain are obtained. The typical energy spectrum of the symmetry is given. 相似文献
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We propose a scheme for generation of SU(2) coherent states for an atomic ensemble and a cavity mode. In the scheme a collection of two-level atoms resonantly interact with a single-mode quantized field. Under certain conditions, the system can evolve from a Fock state to a highly entangled SU(2) coherent state. The operation speed increases as the number of atoms increases, which is important in view of deeoherence. 相似文献
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TOGANO Y AOI N BABA H HONDA T OKADA K HARA Y IEKI K ISHIBASHI Y ITOU Y IWASA N KANNO S KAWABATA T KIMURA H KONDO Y KURITA K KUROKAWA M MORIGUCHI T MURAKAMI H OISHI H OTA S OZAWA A SAKURAI H SHIMOURA S SHIODA R TAKESHITA E TAKEUCHI S YAMADA K YAMADA Y YASUDA Y YONEDA K MOTOBAYASHI T 《中国科学:物理学 力学 天文学(英文版)》2011,(Z1)
Two-proton relative momentum distributions from the break-up channels 23Al→p+p+21Na and 22Mg→p+p+20Ne at an energy of 60-70 A MeV have been measured together with two-proton opening angles at the projectile fragment separator beamline (RIPS) in the RIKEN Ring Cyclotron Facility. The results demonstrate the existence of diproton emission component from single-step 2He for highly excited 23Al and 22Mg. 相似文献