6He beta-decay rate and the suppression of the axial constant in nuclear matter

Understand

We present a microscopic calculation of the 6He beta-decay into the ground state of 6Li.

• To this end, we use chiral perturbation theory at next-to-next-to-next-to-leading order to describe the nuclear weak-currents.
• The nuclear wave functions are derived from the J-matrix inverse scattering nucleon-nucleon potential (JISP), and the Schroedinger equation is solved using the hyperspherical-harmonics expansion.
• Our calculation brings the theoretical decay-rate within 3% of the measured one.