Speaker
Description
The Japan-Italy collaboration in hypernuclear physics has a long history since the 1990s at DAΦNE (FINUDA experiment) and then at J-PARC.
At J-PARC, we have studied spectroscopic studies of Ξ hypernuclei with the (K-,K+) reaction (E05) as well as neutron-rich Λ hypernuclei with the (π-,K+) reaction (E10), employing magnetic spectrometers at the K1.8 beam line. A missing mass spectrum for 12ΞB was obtained, indicating existence of Ξ hypernuclear bound states. Recently, a new experiment (E70) with an updated spectrometer has been also conducted.
In addition, structure of Λ hypernuclei has been also investigated via γ-ray spectroscopy at J-PARC. In particular, a γ-ray transition in 4ΛHe has confirmed a large charge symmetry breaking in Λ hypernuclei. A further experiment to precisely measure the γ-ray transition in the mirror hypernucleus, 4ΛH, is in progress.
Such spectroscopic studies of hypernuclei will provide crucial data to determine the hyperon-nucleon interactions in nuclear matter and to unveil high density matter in neutron stars.