Constraints on Ξ− nuclear interactions from capture events in emulsion

E. Friedman; A. Gal

doi:10.1016/j.physletb.2021.136555

Constraints on Ξ⁻ nuclear interactions from capture events in emulsion

E. Friedman
, A. Gal^*

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

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

Original language	English
Article number	136555
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	820
DOIs	https://doi.org/10.1016/j.physletb.2021.136555
State	Published - 10 Sep 2021

Bibliographical note

Publisher Copyright:
© 2021 The Author(s)

Keywords

Hyperon strong interactions
Ξ atoms and hypernuclei

Access to Document

10.1016/j.physletb.2021.136555

Cite this

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title = "Constraints on Ξ− nuclear interactions from capture events in emulsion",

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

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AU - Gal, A.

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

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KW - Ξ atoms and hypernuclei

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