No abstract

No abstract

Taking into account the effect of electron screening on the electron energy and electron capture threshold energy, by using the method of Shell-Model Monte Carlo and Random Phase Approximation theory, we investigate the strong electron screening capture rates of chromium isotopes according to the linear response theory screening model. The strong screening rates can decrease by about 40.43% (e.g., for60 Cr at T 9 = 3.44, Y e = 0.43).Our conclusions may be helpful to the researches of supernova explosion and numerical simulation.

By introducing the Dirac δ-function and Pauli exclusion principle in the presence of superstrong magnetic fields (SMFs), we investigate the influence of SMFs on beta decay and the change rates of electron fraction (CREF) of nuclides 56Fe, 62Ni, 64Ni and 68Ni in magnetars, which are powered by magnetic field energy. We find that the magnetic fields have a great influence on the beta decay rates, and the beta decay rates can decrease by more than six orders of magnitude in the presence of SMFs. The CREF also decreases by more than seven orders of magnitude in the presence of SMFs.

Energy levels, wavelengths, transition rates and line strengths are reported for the 2s 2 2p 3 2s2p 4 transition array in Kr(XXX), Rb(XXXI) and Sr(XXXII). Wave functions were determined using the multiconguration Dirac Fock method with account for valence and core-valence correlation eects. The present results are presented and compared with experimental data and with values from other calculations. The calculated values including corevalence correlation are in good agreement with other available theoretical and experimental values, and therefore can be used for the further astrophysical investigations.