Recent progress on hypernuclei

Abstract

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

8 pages, invited talk at the 27th INPC, Glasgow UK, July 2019, prepared for Journal of Physics Conference Series