First-forbidden β decay: Meson-exchange enhancement of the axial charge at A∼16

E. K. Warburton, I. S. Towner, and B. A. Brown
Phys. Rev. C 49, 824 – Published 1 February 1994
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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 O16 is considered on the same footing. The wave functions utilized include up to 4ħω 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 O16, which is in excellent agreement with meson-exchange calculations in the soft-pion approximation.

  • Received 30 August 1993

DOI:https://doi.org/10.1103/PhysRevC.49.824

©1994 American Physical Society

Authors & Affiliations

E. K. Warburton

  • Brookhaven National Laboratory, Upton, New York 11973

I. S. Towner

  • AECL Research, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0

B. A. Brown

  • National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824

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Vol. 49, Iss. 2 — February 1994

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