Statistical double Λ hypernuclear formation from Ξ− absorption at rest in light nuclei. (18th June 2020)

• Record Type: Journal Article
• Authors: Ohnishi, Akira; Ishizuka, Chikako; Tsubakihara, Kohsuke; Hirata, Yuichi
• Is Part Of: Progress of theoretical and experimental physics. Volume 2020:Number 6(2020)
• Publication Date: 2020-06-18
• Subjects: D00 -- D25 -- D29 -- D33; Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/ptaa047
• Languages: English
• ISSNs: 2050-3911

Abstract

Abstract: We investigate double $\Lambda$ hyperfragment formation from the statistical decay of double $\Lambda$ compound nuclei produced in the $\Xi^-$ absorption at rest in the light nuclei $^{12}\mathrm{C}$, $^{14}\mathrm{N}$, and $^{16}\mathrm{O}$ . We examine the target and the $\Lambda\Lambda$ bond energy dependence of the double $\Lambda$ hyperfragment formation probabilities, especially of those double hypernuclei observed in experiments. For the $^{12}\mathrm{C}$ ($^{14}\mathrm{N}$ ) target, the formation probabilities of $^{\, \;\;6}_{\Lambda\Lambda}\mathrm{He}$ and $^{\;10}_{\Lambda\Lambda}\mathrm{Be}$ ($^{\;13}_{\Lambda\Lambda}\mathrm{B}$ ) are found to be reasonably large as they are observed in the KEK-E373 (KEK-E176) experiment. By comparison, for the $^{16}\mathrm{O}$ target, the formation probability of $^{\;11}_{\Lambda\Lambda}\mathrm{Be}$ is calculated to be small with $\Delta B_{\Lambda\Lambda}$ consistent with the Nagara event. We also evaluate the formation probability of ${}^{\, \;\;5}_{\Lambda\Lambda}\mathrm{H}$ from a $\Xi^-$ –${}^{6}\mathrm{He}$ bound state, ${}^{7}_{\Xi}\mathrm{H}$ .