$\hat{I}ž$-nuclear constraints from $\hat{I}{ž}^{-}$ emulsion capture events

Abstract

All five KEK and J-PARC two-body $\hat{I}{ž}^{-}$+${}^A$Z $\to$ ${}_{\hat{I}}^{A^{\prime }}›$Z'+${}_{\hat{I}}^{A^{\prime \prime }}›$Z'' capture events in light emulsion nuclei, including KISO and IBUKI in ${}^{14}$N, are consistent with Coulomb-assisted $1p_{\hat{I}{ž}^{-}}$ nuclear states. The underlying $\hat{I}ž$-nuclear potential is strongly attractive, with nuclear-matter depth $V_{\hat{I}}ž$ larger than 20 MeV. The recent ${}^{14}$N capture events KINKA and IRRAWADDY assigned by J-PARC E07 to $1s_{\hat{I}{ž}^{-}}$ nuclear states, and implying considerably shallower $V_{\hat{I}}ž$, have also another interpretation as $1p_{\hat{I}{ž}^0}$ nuclear states.

Invited talk at HYP2022, Prague, June-July 2022, reporting on recent Phys. Lett. B published work [15,24]. Published in EPJ Web of Conferences 271, 03002 (2022)