Structure of beta-decay strength function Sβ(E) and quenching of axial-vector weak interaction constant in halo nuclei
Joint Institute for Nuclear Research, 141980 Dubna, Russia
* e-mail: email@example.com
Published online: 30 September 2020
Resonance structure of the beta decay strength function Sβ (E) for GT β--decay of halo nuclei 6He and 11Li is analyzed. Compare experimental total strength for β-transitions in gv2/4π units with the Ikeda sum rule (in (gAeff)2/4π units) one can determine the squared ratio of axial-vector and vector weak interaction constants value (g eff/gV)2. We obtained (g eff/gv)1 = 1.272 ± 0.010 for 6He and (gA eff/gv)2 = 1.5±0.2 for 11Li β--decays. Quenching of the weak axial-vector constant gAeff in halo nuclei is discussed. Analysis of the evolution of EGTR - EIAS toward neutron-rich nuclei was done. It is shown that the value Z/N ≈ 0.6 corresponds to the SU(4) Wigner's spin-isospin symmetry region.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.