Influence of electron density,temperature and decay energy onβ^(-)decay rates in a stellar environment

In this paper,the β^(−)decay rates in the magnetic field of a neutron star are investigated under different conditions of electron density,temperature,and decay energy.By considering the influence of magnetic field on the electron spectrum,we improve the Takahashi-Yokoi model and perform the calculations of β^(−)decay rates for the nickel(Ni)isotopes,which are the typical neutron-rich nuclei participating in the rapid neutron-capture process(r-process).It is found that the β^(−)decay rates are increased significantly in the extremely strong magnetic field(B>10^(15)G).Furthermore,we find oscillation of β^(−)decay rates with the increase of magnetic field strength,implying that the magnitude of β^(−)decay rates is closely related to not only the decay energy but also the environmental electron density.In contrast,the impact of temperature on the β^(−)decay rates is found to be negligible in the range of 10^(7)K<T<10^(10)K.