Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions

Production of light 𝚵-hypernuclei, 𝚵7H

A light Ξ hypernucleus, Ξ7H, is expected to be bound. Furthermore, it is pointed out that Ξ7H will decay into ΛΛ5H with a large branching ratio. We plan to study the 7Li(K−, K+) reaction to investigate the Ξ7H system and to evaluate the experimental feasibility to perform decay pion spectroscopy of ΛΛ5H in future.

A spectroscopic study of 𝚵10Li hypernucleus via the 10B(K−,K+)X reaction

We are planning a 10ΞLi production experiment using the 10B(K−,K+)X reaction at the J-PARC, K1.8 beamline. We perform spectroscopy of missing masses using the S − 2S spectrometer, which can achieve high resolution. Since the cross section of Ξ-hypernuclei is very small, we would like to use a thick target. To ensure the missing mass resolution, we propose a semiinclusive method using a tracking device to detect the decay particles from Ξ-hypernuclei.

Single- & double-strangeness hypernuclei up to A = 8 within χEFT

We investigate S=−1 and −2 hypernuclei with A = 4 − 8 employing the Jacobi-NCSM approach and in combination with baryon-baryon interactions derived within the frame work of chiral effective field theory. The employed interactions are transformed using the similarity renormalization group (SRG) so that the low- and high-momentum states are decoupled, and, thereby, convergence of the binding energies with respect to model space can be significantly speeded up. Such an evolution is however only approximately unitary when the so-called SRG induced higher-body forces are omitted. We first explore the impact of the SRG evolution on the Λ separation energies BΛ in A = 3 − 5 hypernuclei when only SRG-evolved two-body and when both twoand three-body forces are included. For the latter scenario, we thoroughly study predictions of the two almost phase-equivalent NLO13 and NLO19 YN potentials for A = 4 − 7 hypernuclei. We further explore CSB splittings in the A = 7; 8 multiplets employing the two NLO YN potentials that include also the leading CSB potential in the ΛN channel, whose strength has been fitted to the presently established CSB in A = 4. Finally, we report on our recent study for Ξ hypernuclei based on the ΞN interaction at NLO.