Spin-Exchange Collisions in the K–Li System

Optics and Spectroscopy - Spin-exchange cross sections and the magnetic-resonance frequency shift in collision of lithium and potassium atoms in the ground state have been calculated for the first...     

Energy dependence of direct effects in the6Li +6Li → 3α reaction around the Coulomb Barrier

The⁶Li +⁶Li → 3α reaction has been studied from 2.4 to 6.7 MeV incident energy in a kinematically complete experiment. Quasi-free effects with an α-particle spectator in the target, in the projectile and in the CM-system were investigated. Momentum distributions and angular correlations were interpreted by using PWIA and DWBA.     

A potential description of α-particle elastic scattering by the 6Li and 7Li nuclei

The results of analytic and numerical calculations of the real part of the ??⁶Li interaction potential in the cluster folding model are reported. Elastic scattering phases in the ??+^6,7Li systems are calculated and constructed, a classification of multipole transitions for back photodisintegration reactions is given.     

The Ground State Energy of the Hypernucleus Λ6Li

This paper extends the method of the harmonic-oscillator product state as basis function to the hypernucleus A6Li which is of non-zero spin. we have studied the characteristic of the ground state of the hypernucleus A6Li with this method and an α+ p + A three cluster model. The calculated result shows the method can be used to calculate the energy level of the system in which the interaction between the constituent clusters is spin-dependent.     

Microscopic multicluster description of the 7Li7Be, 8Li8B and 9Li9C mirror nuclei

The ⁹Li and ⁹C mirror systems are investigated in a microscopic α+³H+n+n and α+³He+p+p multicluster framework using the stochastic variational method. Possibility of existence of neutron (proton) halo structure is studied. The quadrupole moment of ⁹C is predicted to be −5.04 e fm².     

On the K^＋—^6Li Elastic Scattering

Total and differential cross sections for K^ -^6Li elastic scattering are calculated using the folding optical potential model,in which the influence of three factors is considered including the recoil of target nucleus,the loosely bounded nuclear density and the unusual spin of ^6Li ground state.The theoretical results are found in pretty good accordance with the existing experimental data at PK=715 MeV/c.     

Evidence for phonon mediated pairing interaction in the halo of the nucleus ¹¹Li

With the help of a unified nuclear-structure-direct-reaction theory we analyze the reaction 1H(11Li,?Li)3H. The two halo neutrons are correlated through the bare and the induced (medium polarization) pairing interaction. By considering all dominant reaction channels leading to the population of the 1/2? (2.69 MeV) first excited state of ?Li, namely, multistep transfer (successive, simultaneous, and nonorthogonality), breakup, and inelastic channels, it is possible to show that the experiment provides direct evidence of phonon mediated pairing.     

Measurement of Angular Distribution for the ^8Li（p,d）^7Li Reaction

The ^8Li（p, d）^7 Li reaction plays an important role in the inhomogeneous Big Bang nucleosynthesis and in the seed-nuclide production phase for the r-process. For the first time, its angular distribution at backward angles was measured in inverse kinematics at Ec.m.=4.0 MeV by using an ^8Li secondary beam. The result of measurement includes the contributions of ^8Li（p, d0）^7Li and ^8Li（p, d1）^7Li^＊. The ^8Li（p, d0）^7Li component is estimated to be 40%-58% in the mixture angular distribution by analysing the measured result.     

Investigation of the sequential break-up mode6Li→6Li*(31 +)→α+d of 156 MeV6Li projectiles on208Pb in the very forward angular hemisphere

The sequential break-up of 156 MeV⁶Li projectiles colliding with²⁰⁸Pb has been investigated in the very forward angular hemisphere in order to explore the role of the Coulomb and nuclear interaction in inducing projectile break-up processes. The experiments use the Karlsruhe spectrograph Little John with a newly developed technique to detect efficiently break-up pairs of-particles and deuterons emitted with small relative energies and within a small opening angle. The observed differential cross section for the projectile excitation⁶Li⁶Li^* (I=3_i ⁺) has been analysed (together with forward elastic scattering) by a coupled channel approach, and various sensitivities to the nuclear potential and other ingredients have been studied. We conclude, that in the angular region below half the grazing angle the excitation is completely due to the Coulomb force. This feature is a basis for an application of the disintegration approach for studies of radiative capture cross section of astrophysical interest.On leave from Institute of Atomic Physics Bucharest, Romania     

Electronic Structures of the Filled Tetrahedral Semiconductor Li3AlN2

The first-principles total energy calculations with the local density approximation （LDA） and the plane wave pseudopotential method are employed to investigate the structural properties and electronic structures of Li3AlN2. The calculated lattice constants and internal coordination of atoms agree well with the experimental results. Detailed studies of the electronic structure and the charge-density redistribution reveal the features of the strong ionicity bonding of Al-N and Al-Li, and strong hybridizations between Li and N in Li3AlN2. Our band structure calculation verifies Li3AlN2 is a direct gap semiconductor with the LDA gap value of about 2.97eV and transition at Г.     

Beyond the Monchick–Mason approximation: the mobility of Li+ Ions in H2

The Monchick–Mason approximation for the calculation of the transport coefficients of atomic ions in diatomic gases is extended in a manner that allows comparison of theoretical and experimental mobilities of gaseous ions to serve as quantitative tests of the accuracy of the ab initio, angle- and position-dependent interaction potentials used in the calculations. The feasibility of this procedure is demonstrated with Li⁺ in H₂.     

Noether symmetries and the quantization of a Liénard-type nonlinear oscillator

The classical quantization of a Liénard-type nonlinear oscillator is achieved by a quantization scheme (M. C. Nucci. Theor. Math. Phys., 168:994–1001, 2011) that preserves the Noether point symmetries of the underlying Lagrangian in order to construct the Schrödinger equation. This method straightforwardly yields the Schrödinger equation in the momentum space as given in (V. Chithiika Ruby, M. Senthilvelan, and M. Lakshmanan. J. Phys. A: Math. Gen., 45:382002, 2012), and sheds light on the apparently remarkable connection with the linear harmonic oscillator.     

同位素7Li和6Li的性质殊异

本文研究了同位素7 Li和6 Li在几个方面的性质差异．用相对论量子力学计算指出,6 Li的电子能级比7 Li的能级低,同时,对电偶极E （1）和磁偶极M （1）的能级跃迁波长,6 Li的跃迁波长都要比7 Li的长．由于7 Li和6 Li的核自旋的大小不同,可以看出在磁场2万高斯和温度100－20 K之间,7 Li的磁极化比6 Li的约大13倍．7 Li和6 Li的磁极化这种差异,也是一种可能的同位素7 Li／6 Li的分离方法．