Fri·Apr 2, 2021Friday·April 2, 2021

1. 01*

   Constraints on ${\Xi }^{-}$ nuclear interactions from capture events in emulsion

   E. Friedman🇮🇱 · A. Gal🇮🇱

   Five ${\Xi }^{-}p\to \Lambda \Lambda$ two-body capture events in ${}^{12}$C and ${}^{14}$N emulsion nuclei, in which a pair of single-$\Lambda$ hypernuclei is formed and identified by their weak decay, have been observed in $(K^{-},K^{+})$ emulsion exposures at KEK and J-PARC. Applying a ${\Xi }^{-}$-nucleus optical potential methodology to study atomic and nuclear transitions, we confirm that these capture events occur from Coulomb assisted $1p_{{\Xi }^{-}}$ nuclear states. Long-range $\Xi N$ shell-model correlations are found essential to achieve consistency between the ${}^{12}$C and ${}^{14}$N events. The resulting $\Xi$-nuclear interaction is strongly attractive, with $\Xi$ potential depth in nuclear matter $V_{\Xi }\gtrsim 20$ MeV. Implications to multi-strangeness features of dense matter are outlined.

   ↳ nucl-thhep-phnucl-exPLB(2021)·49 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.