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We present a microscopic calculation of the 6He beta-decay into the groundstate of 6Li. To this end we use the impulse approximation to describe thenuclear weak current. The ground state wave functions are obtained from thesolution of the nuclear 6-body problem. The nucleonnucleon interaction isdescribed via the J-matrix inverse scattering potential (JISP), and the nuclearproblem is solved using the hyperspherical-harmonics approach. This approachresults in numerical accuracy of about 2 per mil in the transition matrixelement. Bearing in mind that the contribution of meson-exchange currents tothe transition matrix element is about 5%, these results pave the way foraccurate estimation of their effect.

Weak reactions with light nuclei - 6He beta-decay as a test case for the nuclear weak current