AUTHOR=Suhonen Jouni , Kostensalo Joel 

TITLE=Double β Decay and the Axial Strength

JOURNAL=Frontiers in Physics

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00029

DOI=10.3389/fphy.2019.00029

ISSN=2296-424X

ABSTRACT=<p>Quenching of the weak axial strength <italic>g</italic><sub>A</sub> is discussed and relations of this quenching to the nuclear matrix elements of double beta decays are highlighted. An analysis of Gamow-Teller transitions in the mass range <italic>A</italic> = 62 − 142 is presented and its results are compared with those of many previous works. The enhancement of the axial charge is discussed for first-forbidden pseudoscalar β transitions. Higher-forbidden β transitions are introduced and their role in determining the effective value of <italic>g</italic><sub>A</sub> is examined, in particular from the point of view of the β-decay half-lives and the shapes of electron spectra of forbidden non-unique β transitions.</p>