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在手征SU(3)夸克集团模型下, 通过共振群方法(RGM)计算了双Λ超核^6_ΛΛHe,^5_ΛΛHe,^5_ΛΛH,^4_ΛΛHe,和^4_ΛΛH的结合能. 结果表明, 假定双Λ超核具有双Λ集团和壳心核集团构成的两集团结构, 得到的^6_ΛΛHe超核的结合能与实验值基本吻合, 表明手征SU(3)夸克集团模型不仅能较好地描述重子谱、N-N和Y-N相互作用及轻Λ超核的结合能, 也能较好地描述Y-Y相互作用及双Λ超核^6_ΛΛHe,^5_ΛΛHe,^5_ΛΛH,^4_ΛΛHe,和^4_ΛΛH的结合能, 指出了它们存在的可能性. 相似文献
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用少体理论方法对双Λ超核ΛΛ5He(ΛΛ5H)及ΛΛ4He(ΛΛ4H)的结合能进行了计算.结果表明,ΛΛ5He(ΛΛ5H)存在稳定的束缚态. 它们的双Λ结合能分别为对的研究的初步结果表明,它存在束缚态但相对于衰变不稳定.至于,结论是它不存在束缚态. 相似文献
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用少体理论方法对双超核及的结合能进行了计算.结果表明,存在稳定的束缚态.它们的双结合能分别为对的研究的初步结果表明,它存在束缚态但相对于衰变不稳定.至于,结论是它不存在束缚态. 相似文献
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在手征SU(3)夸克集团模型下,通过共振群方法(RGM)计算了双Λ超核~6_(ΛΛ)He, ~5_(ΛΛ)He, ~5_(ΛΛ)H, ~4_(ΛΛ)He和~4_(ΛΛ)H的结合能.结果表明,假定双Λ超核具有双Λ集团和壳心核集团构成的两集团结构,得到的~6_(ΛΛ)He超核的结合能与实验值基本吻合,表明手征SU(3)夸克集团模型不仅能较好地描述重子谱、N-N和Y-N相互作用及轻Λ超核的结合能,也能较好地描述Y-Y相互作用及双Λ超核的结合能.使用相同的模型参数,计算了轻双Λ超核~5_(ΛΛ)He, ~5_(ΛΛ)H, ~4_(ΛΛ)He和~4_(ΛΛ)H的结合能,指出了它们存在的可能性. 相似文献
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在手征SU(3)夸克模型和谐振子基下,Y-N(超子-核子)相互作用采用非定域势,N-N相互作用采用高斯型势,根据少体理论研究并计算了轻超核3 H 4 H 4He,,ΛΛΛ的基态结合能,并同实验值做了比较。 相似文献
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利用手征SU(3)夸克集团模型,通过共振群方法(RGM)得到非定域的YN相互作用势和Λ超子与壳心核的相互作用势,并用其计算了轻Λ超核5ΛHe,4ΛHe和4ΛH的结合能.计算结果表明,手征SU(3)夸克集团模型不仅能较好地描述Λp散射,也能较好地描述轻Λ超核的结合能.由于利用共振群方法(RGM)直接抽取的非定域YN相互作用势更为准确,因此计算得到的轻Λ超核5ΛHe,4ΛHe和4ΛH的结合能更符合实验数据,同时,这也为将来研究超核和多夸克体系确定了一套更为精确的模型参数. 相似文献
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Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the possible existence of a_(ΛΛ)~4n bound state. Our results indicate that the _(ΛΛ)~4n is unbound, being just above threshold.We discuss the role played by the ~1S_0 nn repulsive term of the Yukawa-type Malfliet-Tjon interaction. 相似文献
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We employ a direct capture method to study the influence of D-state in ^4He on S factor for the ^2H(d,γ)^4He reaction, in which the D-state component of the colliding deuterons and D-state component in ^4He ground state are considered. The parameters of Woods-Saxon (WS) potentials are obtained by reproducing the binding energy of d-d (i.e. ^2H-^2H) system, and d-d elastic scattering phase shifts calculated by the resonating group method. The theoretical results are in good agreement with the experimental data at Ec.m〈 3 MeV. The impact of the D state probability in ^4He on the extrapolated value of the astrophysical S factor for ^2H(d, γ)^4He reaction is discussed. 相似文献
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WANG Ji-Min DUAN Jun-Feng YAN Yu-Liang SUN Xiao-Jun ZHANG Jing-Shang 《理论物理通讯》2006,46(3):527-532
In n +^10B reactions, ^5He cluster emission has been discussed with the updated level scheme and the new optical model parameters. In this paper the reaction channels related to ^5He emission are listed in detail. By using the new reaction model for light nuclei, the double-differential cross sections of total outgoing neutrons for n + ^10 B reactions at En= 14.2 MeV have been calculated, and the results agree fairly well with the measurements. Particularly, in the energy-angular spectra the contribution from the 5He-emission to the total outgoing neutron double-differential cross sections has also been analyzed, and the partial energy-angular spectra of 60° at En= 14.2 MeV have been given. The calculated results indicate that once the 5He emission is taken into account, the fitting with the double-differential measurements of total outgoing neutrons at the low energy region could be improved. Therefore, to consider the ^5He emission properly in the reaction processes of light nuclei is necessary. 相似文献
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In this paper, double Λ binding energies BΛΛ s of ΛΛ5He(ΛΛ5H), AA4He and ΛΛ4H are calculated with the help of few-body models. The results show that stable binding state for ΛΛ5H or ΛΛ5He exists definitely with BΛΛ(ΛΛ5H)=6.75MeV and BΛΛ(ΛΛ5He)=7.67MeV,respectively. As to ΛΛ4He and ΛΛ4H, preliminary results indicate that ΛΛ4H is unstable against decaying into Λ+Λ3H, and ΛΛ4He has no binding state. 相似文献
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The γ-rays and protons from an Ed = 20 keV deuteron beam incident on a D-Ti target were measured. A branching ratio of the 2H(d,γ)^4He reaction versus the ^2H(d,p)^3H reaction of Гγ/Гp = (1.061 0.34) x 10.7 has been obtained, and the astrophysical S factor of the ^2H(d,γ)He reaction at the center of mass energy Ecm ≈ 7 keV of (6.0±2.4) ×10^6 keV.b was deduced. 相似文献
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固体^3He在1mK附近发生核磁有序,本文介绍了它的磁相图,物理性质和理论模型。固体^4He中有可能存在像液体^4He和液体^3He中出现的超流动态,对理论预言和实验上的探索进行了评述。 相似文献
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The angular distributions of the charge exchange reaction ^1H(^6He,^6Li)n were measured in reverse kinematics with a secondary ^6He beam at the energy of 4.17 A MeV.The data were analysed in the context of a microscopic calculation.It is shown that both the ground state of ^6He and the second excited state of ^6Li(3.563MeV,0^ ) have a halo structure. 相似文献
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2004年,E.Kim等在一个固态氦的扭摆实验中发现,当温度降到约100mK以下时,扭摆的震荡周期突然减小.这意味着部分固态氦与大块晶格的运动退耦合,导致了转动惯量的突降.目前,学术界对上述现象的共识是,发生了超固体(supersolid)相变.3年以来,尽管在理论和实验两方面均有明显进展,但有关相变存在的热力学证据一直缺乏.最近,来自美国宾夕法尼亚州立大学的X.Lin等,在对固态氦的比热测量中,观察到一个与相变温度相应的比热峰,从而证实这是一个从正常固体相到超固体相的二级相变. 相似文献
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N2H4和He(2^3S),Ne(^3P0,2)的解离激发反应 总被引:1,自引:0,他引:1
本文利用分子束和化学发光技术,在单次碰撞条件下,首次研究了N2H4与亚稳态原子He(2^3S),Ne(^3P0,2)的解离激发反应,探测到反应的激发态产物NH(A^3Π)的化学发光。N2H4与He(2^3S)的解离激发反应还探测到NH(c^1Π)的化学发光。同样条件下,N2H4与Ar(^3P0,2)作用没有观察到NH(A,c)的发光光谱。利用计算机模拟化学发光光谱,求得激发态产物NH(A^3Π)和 相似文献
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本文从ΛΛα三体模型出发,在简谐振子形式下完成了对超核_(ΛΛ)~6He的变分计算。利用形状密度对在各类高斯型相互作用下的_(ΛΛ)~6He的结构和粒子关联进行了详细的研究,得到了内部运动模式。 相似文献