26 research outputs found
Observation of Spin-Dependent Charge Symmetry Breaking in Interaction: Gamma-Ray Spectroscopy of He
The energy spacing between the ground-state spin doublet of He(1,0) was determined to be keV, by measuring
rays for the transition with a high efficiency germanium
detector array in coincidence with the He He
reaction at J-PARC. In comparison to the corresponding energy spacing in the
mirror hypernucleus H, the present result clearly indicates the
existence of charge symmetry breaking (CSB) in interaction. It is
also found that the CSB effect is large in the ground state but is by one
order of magnitude smaller in the excited state, demonstrating that the
CSB interaction has spin dependence
Search For A Ξ Bound State In The 12C(K-,K+)X Reaction At 1.8 Gev/c
The 26th International Nuclear Physics Conference, 11-16 September, 2016, Adelaide, Australia
High-resolution search for the pentaquark via a pion-induced reaction at J-PARC
The pentaquark has been searched for via the
reaction with beam momenta of 1.92 and 2.01 GeV/ at J-PARC. A missing mass
resolution of 2 MeV (FWHM) was achieved but no sharp peak structure was
observed. The upper limits on the production cross section averaged over the
scattering angle from 2 to 15 in the laboratory frame were
found to be less than 0.28 b/sr at the 90\% confidence level for both the
1.92- and 2.01-GeV/ data. The systematic uncertainty of the upper limits was
controlled within 10\%. Constraints on the decay width were also
evaluated with a theoretical calculation using effective Lagrangian. The
present result implies that the width should be less than 0.36 and 1.9 MeV for
the spin-parity of and , respectively.Comment: 12 pages, 9 figures; published versio
Search for the pentaquark at J-PARC
We have been searching for the Θ^+ pentaquark via the π^−p→K^−X reaction at the J-PARC hadron facility. No peak structure was observed in the missing mass spectrum obtained at 1.92 GeV/c beam momentum. The upper limit for the production cross section averaged over the scattering angle from 2° to 15° in the laboratory frame was derived to be 0.26 μb/sr. In order to make a more stringent constraint we have also performed a measurement at 2.0 GeV/c. Present analysis status of this new data is reported