| Since the first lambda hypernuclei was found in 1953, Brookhaven,CERN and KEK laboratories have carried the research of lambda hypernuclei and collected lots of experimental data. As hyperon has the strange quantum number, it can go deep into the interior of nuclei, thus it is the right probe to study the nuclear structure. Since hypernuclei and isospin nuclei both lie in deep nonperturb energy momentum area, they can be described with meson and baryon freedom, so this research has broken the concept of that atomic nucleus is composed of protons and neutrons, it shows that one or even more hyperons can exist in nucleus beside protons and neutrons.We have studied the properties of singleΛ,doubleΛhypernuclei in the frame work of relativistic mean field theory which has been successfully used for the description of stable and unstable nuclei, and have got some new results.(1) We have put forward the effective Lagrangian density, after considering the mean filed approximation, we deduced the Dirac movement functions of nucleon and hyperon, also the Klein-Gordon functions of mesons and photon; We have written the new computer codes to carry the numerical calculation.(2) We have calculated the total binding energy of different singleΛ,doubleΛhypernuclei, the single particle energy distribution of nucleon and hyperon,and the charge density distribution of hypernuclei; We have discussed the influence of hyperons on the nuclear core, computed the rearrange energy.(3) We have calculated the spin-orbit energy splits and the spin-orbit potentials ofΛhyperon in different hypernuclei, explained the weak spin-orbit coupling ofΛhyperon.(4) We have presented the scalar potentials,vector potentials of baryon and tensor potentials of hyperon in different hypernuclei, we found that the binding well depth of hyperon is approximately half of the value of nucleon in hypernuclei.
|
PDF Full Text Request