Conveners
4; Thu-IIIa
- Patrick Achenbach
The $K^+ \; \Sigma^-$ photoproduction off the neutron is investigated with an Isobar model. Measurements of differential cross sections and photon beam asymmetries from the LEPS and CLAS collaborations were used to fit the parameters of the model, which are mainly the coupling constants of numerous resonances. However, fitting a model with a large number of free parameters can be problematic...
We have been performed a high resolution hypernuclear mass spectroscopy measurement by the $(e,e’K^{+})$ reaction at the Thomas Jefferson National Accelerator Facility (JLab). The differential cross section for the $\Lambda/\Sigma^0$ electroproduction is fundamental information to estimate yields of hypernuclei in experiments. Although $\Lambda/\Sigma^0$ photoproduction has been studied well...
In the nucleon-nucleon ($NN$) interaction, realistic nuclear force models have been established with $NN$ scattering data. On the other hand, there are relatively large uncertainties due to limited $\Lambda N$ scattering data in case of the $\Lambda N$ interaction. The spectroscopic studies of $\Lambda$ hypernuclei have played an important role in knowledge of the effective $\Lambda n$...
A large-acceptance superconducting spectrometer for a series of hadron experiments, Hyperon Spectrometer, has been developed at J-PARC. The first experiment, E42, was performed using the Hyperon Spectrometer in 2021 to search for an exotic 6-quark state, the H-dibaryon. The E42 detector is sensitive to search for the H-dibaryon over a broad mass range, measuring ${\Lambda}p\pi^−,...
We performed the J-PARC E40 experiment to measure the $\Sigma p$ scattering from 2018 to 2020. Together with the $\pi^{-}p\to K^{+}\Sigma^{-}$ data, the $\pi^-p\to K^0\Lambda$ events were accumulated as by-product data. The analysis confirmed that $\Lambda$ could be identified with reasonable accuracy of S/N ratio $\sim2.67$. Plus, we found the polarization of $\Lambda$ ($P_{\Lambda}$) was...
Recently, a few $\Xi$-hypernuclear events have been reported from emulsion experiments. The $\Xi$-nucleus interaction was found to be attractive. However, the binding energies and their widths of $\Xi$ hypernuclei are still uncertain based on the emulsion events, so energy spectra measured with higher statistics by spectroscopic experiments are needed.
We are going to perform a...
The ΛΛ pairing effects in spherical and deformed multi-L hyperisotopes are investigated in the framework of the Skyrme-Hartree-Fock approach employing a d pairing force with the pairing strength of L hyperons being 4/9 of that for nucleons. For spherical hyperisotopes, the occurrences of magic numbers -S = 2, 8, 18, 20, 34, 58, 68, and 70, which are attributed to a Woods-Saxon-like Λ hyperon...
