High-resolution spectroscopy for new determination of Lambda binding energies in light hypernuclei at JLab
Conference
Nagao, S, Camsonne, A, Garibaldi, F et al. (2026). High-resolution spectroscopy for new determination of Lambda binding energies in light hypernuclei at JLab
. 500 10.22323/1.500.0170
Nagao, S, Camsonne, A, Garibaldi, F et al. (2026). High-resolution spectroscopy for new determination of Lambda binding energies in light hypernuclei at JLab
. 500 10.22323/1.500.0170
Hypernuclei are few-body nuclear systems containing hyperons, and their binding energies provide essential information on baryon–baryon interactions. Decay Pion Spectroscopy (DPS) is a high-precision method to determine Λ binding energies by measuring monochromatic decay pions, and was first demonstrated with the MAMI-C electron accelerator. A new DPS program is planned at Jefferson Lab (JLab) in the United States, aiming for much higher statistics, improved signal-to-noise ratio, and accuracy on the order of 10 keV. The experiment will exploit the high-energy, high-intensity CEBAF beam, together with the HKS and Enge spectrometers, to achieve efficient K+ tagging and precise π− detection at backward angles. Simulations predict a momentum resolution of about 260 keV/c and yields larger by more than an order of magnitude compared with previous experiments. These improvements will enable systematic measurements of s- and p-shell hypernuclei and may extend the reach to sd-shell hypernuclei. The results are expected to provide important input for understanding the origin of charge symmetry breaking effect and the ΛN interaction in the nuclear medium.
