Recent progress on hypernuclei

Some of last year's progress made in hypernuclear physics is reviewed as follows: (i) resolving the $_Λ^5$He overbinding problem in single-$Λ$ hypernuclei [1]; (ii) arguing that the onset of binding double-$Λ$ hypernuclei is most likely at $A$=5, with the neutral systems $_{ΛΛ}^{\,\,3}$n and $_{ΛΛ}^{\,\,4}$n unbound by a large margin [2]; and (iii) revising the calculated value of the loosely bound $_Λ^3$H lifetime to a level of $\sim$20% shorter than the free $Λ$ lifetime [3], given recent claims from relativistic heavy ion experiments that $τ(_Λ^3$H) is shorter than $τ_Λ$ by as much as $\approx$(30$\pm$8)%. Also discussed briefly in this context is the lifetime expected for the questionable $_Λ^3$n hypernucleus.

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