Gaussian modification of neutrino energy loss on strongly screening nuclides⁵⁵Co and⁵⁶Ni by electron capture in stellar interior

Abstract：

Gaussian modifications of the neutrino energy loss (NEL) by electron capture on the strongly screening nuclides ⁵⁵Co and ⁵⁶Ni are investigated. The results show that in strong electron screening (SES), the NEL rates decrease without modifying the Gamow-Teller (G-T) resonance transition. For instance, the NEL rates of ⁵⁵Co and ⁵⁶Ni decrease more than two and three orders of magnitude for ρ ₇=5.86, T ₉≤5, Y _e=0.47, Δ=6.3, respectively. In contrast, due to Gaussian modification, the NEL rates increase about two orders of magnitude in SES. Due to SES, the maximum values of the C-factor (in %) on NEL of ⁵⁵Co, ⁵⁶Ni are of the order of 99.80%, 99.56% at ρ ₇=5.86 Y _e=0.47 and 99.60%, 99.65% at ρ ₇=106 Y _e=0.43, respectively.