Integrability of the Bariev Model with a Hard Core under Open Boundary Conditions

For the Bariev model with single electron hopping,pair popping and hard core potential,we prove the integrability of this model under open boundary conditions and obtained the Bethe ansatz equations by using the reflection equations of the open-boundary XXZ model.     

Calculation of Total Recation Cross Sections Induced by Intermediate Energy α—Particles with the Boltamann—Uehling—Uhlenbeck Model

The Boltzmann-Uehling-Uhlenbeck(BUU)model,which includes the Fermi motion,the mean field,individual nucleon-nucleon(N-N)interactions and the Pauli blocking effect,etc.,is used to cakulate the total reaction cross section σR induced by a-particlea on different targets in the incident energy range from 17.4 to 48.1 MeV/u. The calculation result can well reproduce the experimental data.The nucleus-nucleas interaction radius parameter ro was extracted from experimental σR.It is found ro becomes constant with the increasing mass number of target.     

Calculation of Energy Response of Cylindrical G—M Tubes with EGS4 Monte Carlo Code

The energy responses of Ka of two types of cylindrical G-M counter tubes were calculated using an electron-photon cascade Monte Carlo code,EGS4.One type of the G-M counter tubes was GJ4401 (sensitive length 9cm,diameter 1cm),the other was J5 (sensitive length 2cm,diameter 0.3cm),the restricted sampling technique of source photon was used.Good tendency agreements between the simulations and experiments were achieved for gamma radiation with energies ranging from 40keV to 1.25 MeV.For GJ4401,the difference of response between simulations and experiments at 662 keV was 34% and for J5 the difference was 27%.     

Calculation of Energy Levels of Nucleus ^127I in the Particle-Triaxial-Rotor Model

Theoretical calculations have been performed for nucleus ^127I in the framework of the particle-triaxial-rotor model.The calculated results indicate that both the 5^ /2 and 7^ /2 bands are oblate deformed bands.Their comfigurations are associated with the πd5/2[402]5/2 and πg7/2[404]7/2 orbitals and the strong mixing between them.Meanwhile a possible explanation of the strong mixing is given.     

The Green Function Approach to the Two—Dimensional t—J model

We investigate the two-dimensional t-J model by the Green function approach with the Hubbard operator.The phase diagram,including the Neel temperature and the superconducting transition temperature simultaneously,is derived.The results are consistent with experiments of cuprate compounds.     

Calculation of Cross Section of Radiative Halo—Neutron Capture by ^12C at Stellar Energy with the Asymptotic Normalization Coefficient Method

The cross section of the direct neutron capture reaction 12C(n,γ)^13C(1/2^ ) is calculated with the asymptotic normalization coefficient method.The result is in good agreement with a recent experiment at low energy,An enormous enhancement of cross section is found for this direct neutron capture in which a p-wave neutron is captured into an 2s1/2 orbit with neutron halo.The possible effect of the neutron halo structure presented in this reaction on the s-precess in astrophysics is discussed in general.