Physical Review C
A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and a tritium target was performed in Hall A at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to a possible Λnn resonance and a pair of ΣNN states, were observed with an energy resolution of about 1.21 MeV (σ), although greater statistics are needed to make definitive identifications. An experimentally measured Λnn state may provide a unique constraint in determining the Λn interaction, for which no scattering data exist. In addition, although bound A = 3 and 4 Σ hypernuclei have been predicted, only an A=4 Σ hypernucleus (4ΣHe) was found, utilizing the (K−,π−) reaction on a 4He target. The possible bound ΣNN state is likely a Σ⁰nn state, although this has to be confirmed by future experiments.
Original Publication Citation
Pandey, B., Tang, L., Gogami, T. ... Ye, Z., Zhang, J., Zheng, X. (2022) Spectroscopic study of a possible Λ𝑛𝑛 resonance and a pair of (e, e'K⁺) reaction with a tritium target. Physical Review C, 105(5) 1-6, Article L051001. https://doi.org/10.1103/PhysRevC.105.L051001
Hall A Collaboration; Pandey, B.; Tang, L.; Gogami, T.; Hauenstein, Florian; Hyde, Charles; Ye, Z.; Zhang, J.; Zheng, X.; and Et al., "Spectroscopic Study of a Possible Λ𝑛𝑛 Resonance and a Pair of (e, e'K⁺) Reaction With a Tritium Target" (2022). Physics Faculty Publications. 589.