AUTHOR=Ejiri Hiroyasu 

TITLE=Nuclear Matrix Elements for β and ββ Decays and Quenching of the Weak Coupling gA in QRPA

JOURNAL=Frontiers in Physics

VOLUME=Volume 7 - 2019

YEAR=2019

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00030

DOI=10.3389/fphy.2019.00030

ISSN=2296-424X

ABSTRACT=Recent experimental studies at RCNP on single and double beta NMEs relevant to DBDs are briefly reviewed. The axial-vector single beta NMEs are shown to be uniformly reduced by the renormalization  (quenching) factor 0.5-0.6 with respect to the QRPA model NMEs due to non-nucleonic and nuclear medium effects, which are not explicitly included in the model. Impact of the reduction of the axial-vector NMEs on the DBD NMEs and DBD experiments is discussed.