Possibility of a new neutral hypernucleus (n,n,Lambda,Lambda)

Abstract

The status of the light hypernuclei is reviewed, and discussed with models based either on the Nijmegen-RIKEN baryon--baryon interaction or on recent studies using chiral effective field theory. The latter suggests a significantly shorter range for the $\Lambda \Lambda$ interaction, and this favours the formation of a Borromean state made of two neutrons and two hyperons. Various corrections are discussed, in particular the coupling of $N\Lambda$ to $N\Sigma$, or of $\Lambda \Lambda$ to $N\Xi$, and the role of tensor forces. The new nucleus $(n,n,\Lambda ,\Lambda )$ could be produced in various reactions, in particular deuteron--deuteron scattering with the simultaneous production of two charged kaons, for which an estimate of the cross section is provided.

5 pages, Talk given by Jean-Marc Richard at SOTANCP3, 3rd International Workshop on State of the Art in Nuclear Cluster Physics, Yokohama, Japan, May 26-30, 2014, to appear in the proceedings, minor corrections and update of references in the revised version

References in corpus (11)

• Hyperon-nucleon interaction at next-to-leading order in chiral effective field theory
• Strangeness S=-2 baryon-baryon interactions using chiral effective field theory
• Solution of few-body problems with the stochastic variational method: I. Central forces
• Three-body structure of the $nn\Lambda$ system with $\Lambda N-\Sigma N$ coupling
• Faddeev-Yakubovsky search for Lambda-Lambda hydrogen-4
• Is there a bound Lambda-n-n ?
• Limits on the Domain of Coupling Constants for Binding N-Body Systems with No Bound Subsystems
• Nonexistence of a $\Lambda nn$ bound state
• Stochastic Variational Search for ${}_{\Lambda \Lambda }^4$H
• Borromean Binding of Three or Four Bosons
• Critically-bound four-body molecules

Cited by in corpus (1)

• Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams