Is there a bound Lambda-n-n ?

Abstract

The HypHI Collaboration at GSI argued recently for a (Lambda-n-n) bound state from the observation of its two-body (t + pi-) weak-decay mode. We derive constraints from several hypernuclear systems, in particular from the A=4 hypernuclei with full consideration of (Lambda N <--> Sigma N) coupling, to rule out a bound (Lambda-n-n).

12 pages, 4 tables; v2--extended (i) discussion of Table 4 with a new Eq.(7), (ii) discussion of CSB effects; v3 matches published version

References in corpus (8)

• Hyperon-nucleon interaction at next-to-leading order in chiral effective field theory
• Three-body structure of the $nn\Lambda$ system with $\Lambda N-\Sigma N$ coupling
• Shell-model calculations for p-shell hypernuclei
• $\Lambda NN$ and $\Sigma NN$ systems at threshold
• Nonexistence of a $\Lambda nn$ bound state
• Neutron-rich hypernuclei: Lambda-6H and beyond
• $\Lambda NN$ and $\Sigma NN$ systems at threshold: II. The effect of D waves
• The lightest neutral hypernuclei with strangeness -1 and -2

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