Gamma-ray spectroscopy of Λ12C via the (π+, K+) reaction

A gamma-ray spectroscopy experiment via the C-12(pi(+), K+) reaction was carried out at KEK-PS in 2005. The K6 beam line and Superconducting Kaon Spectrometer (SKS) were employed to obtain a missing mass spectrum for C-12(Lambda). An upgraded germanium detector array, Hyperba112, was introduced to detect gamma rays emitted from hypernuclei in coincidence with the (pi(+), K+) reaction. As a result of further analysis, a gamma-ray peak at 6048 keV (preliminary) was newly observed and assigned as the M1 transition from the 6-MeV excited state to the ground state. (C) 2013 Elsevier B.V. All rights reserved.