Neutron-rich hypernuclei: H6Λ and beyond
Abstract
Recent experimental evidence presented by the FINUDA Collaboration for a particle-stable H6Λ has stirred renewed interest in charting domains of particle-stable neutron-rich Λ hypernuclei, particularly for unbound nuclear cores. We have studied within a shell-model approach several neutron-rich Λ hypernuclei in the nuclear p shell that could be formed in (π-, K+) or in (K-, π+) reactions on stable nuclear targets. Hypernuclear shell-model input is taken from a theoretically inspired successful fit of γ-ray transitions in p-shell Λ hypernuclei which includes also ΛN ↔ ΣN coupling (ΛΣ coupling). The particle stability of H6Λ is discussed and predictions are made for binding energies of He9Λ, Li10Λ, Be12Λ, B14Λ. None of the large effects conjectured by some authors to arise from ΛΣ coupling is borne out, neither by these realistic p-shell calculations, nor by quantitative estimates outlined for heavier hypernuclei with substantial neutron excess.
- Publication:
-
Physics Letters B
- Pub Date:
- October 2013
- DOI:
- 10.1016/j.physletb.2013.07.027
- arXiv:
- arXiv:1305.6716
- Bibcode:
- 2013PhLB..725..445G
- Keywords:
-
- Hypernuclei;
- Effective interactions in hadronic systems;
- Shell model;
- Nuclear Theory;
- Nuclear Experiment
- E-Print:
- 15 pages, including 1 figure and 6 tables, presented at INPC2013