Search

The dibaryonic kaonic nuclear bound state, K-pp is searched by studying an exclusive p+p→p+Λ+K+ process at several beam energies. A signature of the K-pp is explored in a p+p→X(≡K-pp)+K+ reaction that follows a decay of the X into p+Λ. We found in a missing-mass ΔM(K+) spectrum and a Λp invariant-mass M(Λp) spectrum of DISTO data at 2.85 GeV a resonance with M = 2267 MeV/c2 and Γ = 118 MeV. Those events are found to be associated with a mono energetic kaon. We investigate this resonance as a candidate of the K-pp further also with a different beam energies. [ABSTRACT FROM AUTHOR]

We have succeeded in observing the is and 2p bound pionic states in [sup 205]Pb nucleus as well separated peaks in the excitation spectrum of the [sup 206]Pb(d, [sup 3]He) reaction. The observed spectrum agreed quite well with the theoretical prediction where the formation cross section was calculated for the deeply bound pionic states. These states are accommodated in proximity to the nuclear surface as halo states in a potential provided by the attractive Coulomb and the repulsive core. The binding energies and the widths were precisely determined, and the values were used to deduce the unknown s-wave part of the π-nucleus interaction and to translate it to the effective pion mass in nuclear matter. [ABSTRACT FROM AUTHOR]

Recently we have succeeded in observing the 1s and 2p bound pionic states in [sup 205]Pb nucleus as well separated peaks in the excitation spectrum of the [sup 206]Pb(d,[sup 3]He) reaction. The observed spectrum agreed quite well with the theoretical prediction where the formation cross section was calculated for the deeply bound pionic states [1]. These states are accommodated in proximity to the nuclear surface as halo states in a potential provided by the attractive Coulomb and the repulsive core. The binding energies and the widths were precisely determined, and the values were used to deduce the unknown s-wave part of the π-nucleus interaction and to translate it to the effective pion mass in nuclear matter. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]