Abstract Following the theory of relativity, in the presence of an ultrastrong magnetic field (UMF) and utilizing a nuclear shell model, we carry out an estimation of the neutrino energy loss (NEL) rates of nuclides 53−60Cr, which occur by electron capture in magnetars. The results show that the NEL rates greatly increase when a UMF is present, and can even exceed nine orders of magnitude at relatively lower density and temperature (e.g. ρ7 = 5.86, Ye = 0.47, T9 = 7.33) in the range from 1013 G to 1018 G. However, the increase in rates was no more than six orders of magnitude at relatively higher density and temperature (e.g. ρ7 = 4.86 × 108, Ye = 0.39, T9 = 14.35).

Keywords physical data and processes: neutrinos, nuclear reactions — stars: super- novae — stars: evolution

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