First-Forbidden beta decay: Medium enhancement of the axial charge at A=16
E. K. Warburton, I. S. Towner, B. A. Brown
Abstract
Calculations are presented for four relatively strong first-forbidden β decays in the region A=11-16 in order to study the very large mesonic-exchange-current enhancement of the rank-zero components. The μ- capture on 16O is considered on the same footing. The wave functions utilized include up to 4ω excitations. Two-body exchange-current matrix elements are calculated as well as one-body impulse approximation matrix elements. The resultant enhancement factor that multiplies the impulse-approximation axial-charge matrix element is thereby determined by comparison to experiment to be εexp = 1.61 0.03 from three β- decays and μ- capture on 16O, which is in excellent agreement with meson-exchange calculations in the soft-pion approximation.
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