Speaker
Prof.
Hiro Ejiri
(RCNP Osaka University)
Description
We report experimental studies of nuclear matrix elements (NME) for astro-neutrinos and double beta decays(DBDs) by nuclear and muon charge exchange reactions. The axial-vector NMEs for various multipolarities for both $\tau ^+$ and $\tau ^-$ sides in wide energy and momentum regions, which are relevant to sypernova and DBDs, are reduced with respect to pnQRPA MNEs. They are discussed in terms of the effective axial-vector coupling $g_A^{eff}$.
[1] H. Ejiri 2000 Phys. Report 338 265.
[2] H. Ejiri , J. Suhonen and K. Zuber 2019 Physics Report 797 1.
