Nuclear electron capture rate from continuum in an astrophysical plasma environment (like solar core) is calculated using a modified Debye-Hückel screening potential and the related non-Gaussian q-distribution of electron momenta. For q = 1 the well-known Debye-Hückel results are recovered. The value of q can be derived from the fluctuation of number of particles and temperature inside the Debye sphere. For 7Be continuum electron capture in solar core, we find an increase of 7-10% over the rate calculated with standard Debye-Hückel potential. The consequence of these results is a reduction of the same percentage of the SSM 8B solar neutrino flux, leaving the SSM 7Be flux unchanged.
Nuclear electron capture rate in stellar interiors and the case of 7Be
AM Scarfone
2009
Abstract
Nuclear electron capture rate from continuum in an astrophysical plasma environment (like solar core) is calculated using a modified Debye-Hückel screening potential and the related non-Gaussian q-distribution of electron momenta. For q = 1 the well-known Debye-Hückel results are recovered. The value of q can be derived from the fluctuation of number of particles and temperature inside the Debye sphere. For 7Be continuum electron capture in solar core, we find an increase of 7-10% over the rate calculated with standard Debye-Hückel potential. The consequence of these results is a reduction of the same percentage of the SSM 8B solar neutrino flux, leaving the SSM 7Be flux unchanged.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.