Spectroscopic Study of Λ Hypernuclei with Electron Beams at Jefferson Lab

Abstract

The missing mass spectroscopy of Λ hypernuclei with the (e, e ′ K + ) reaction was started from 2000 at Jefferson Lab. In this fifteen years, various hypernuclei (A = 7 -52) including hyperon (Λ, Σ 0 ) productions have been studied with newly developed experimental techniques. The (e, e ′ K + ) reaction spectroscopy of Λ hypernuclei features its capability of absolute missing mass calibration and production of new species of hypernuclei which are the isospin partners of well studied hypernuclei by (K − , π − ) and (π + , K + ) reactions. In this paper, we will review how we established the (e, e ′ K + ) spectroscopic study of hypernuclei.

Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications *

“…Our recalibrated give rise to new constraints for the theoretical studies of the strong force, the structure of B Λ hypernuclei, and neutron star interior. Although this paper provides better estimates by recalibrating the early measurements using modern masses of particles and nuclei, the latter may also suffer from significant systematic uncertainties, such as from the energy-range relation in an emulsion and the emulsion density [28,38,44,56]. To further improve the constraints for theoretical research, more precise measurements of the fundamental properties of hypernuclei, like the mass and binding energy, are highly desirable.…”