Speaker
Description
A question of high interest is how to relate double charge exchange (DCE) reactions and double beta decay [1-3]. DCE reaction theory predicts two interfering reaction mechanisms, namely second order Double Single Charge Exchange (DSCE) and first order Meson-Nucleon Majorana DCE (MDCE).
The DSCE mechanism is a distorted wave (DW) two-step reaction wher a reaction amplitude is related to the nuclear matrix elements (NME) of $2\nu 2\beta$ decay, albeit defined by meson exchange.
The MDCE mode is given by a combination of off-shell ($\pi^\pm,\pi^\mp$) reactions in the interacting ions by the isovector pion-nucleon T-matrix [3], described by box diagrams and inducing ($p^2n^{-2}$) and ($n^2p^{-2}$) DCE transitions.
The DCE formalism will be introduced with main focus on the MDCE theory. In closure approximation a striking similarity to the NMEs of $0\nu 2\beta$ DBD is found. Physics aspects of DSCE and MDCE processes will be illustrated and compared to data [3-5].
- H. Lenske et al., Prog. Part. Nucl. Phys., 109:103716, 2019.
- H. Lenske et al., Phys. Rev., C98:044620, 2018.
- F. Cappuzzello et al., Prog. Part. Nucl. Phys. 128 (2023) 103999.
- H. Lenske et al., Universe, 7(4):98, 2021.
- J. Bellone et al., Phys. Lett. B, 807:135528, 2020.
