Abstract
We have carried out an experiment to search for a neutron-rich hypernucleus, HΛ6, by the Li6(π−,K+) reaction at pπ−=1.2 GeV/c. The obtained missing-mass spectrum with an estimated energy resolution of 3.2 MeV (FWHM) showed no peak structure corresponding to the HΛ6 hypernucleus neither below nor above the HΛ4+2n particle decay threshold. An upper limit of the production cross section for the bound HΛ6 hypernucleus was estimated to be 1.2 nb/sr at 90% confidence level.
Highlights
Since the first discovery of a cosmic-ray induced hyperfragment formation event in emulsion [1], various Λ-hypernuclei have been observed
When we embed a Λ hyperon in a nucleus, there are several interesting features theoretically expected for some specific hypernuclei
Before the measurement of the double charge-exchange (DCX) reaction on the 6Li target, we measured the 12C(π+, K+)1Λ2 C reaction at the beam momentum of 1.2 GeV/c to evaluate the missingmass resolution in a kinematical condition close to that of the 6Li(π−, K+)6ΛH reaction
Summary
Since the first discovery of a cosmic-ray induced hyperfragment formation event in emulsion [1], various Λ-hypernuclei have been observed. Extensive studies have been made by missing-mass spectroscopy with magnetic spectrometers by using the (K−, π−) and (π+, K+) reactions [2, 3, 4, 5], and the properties of the ΛN interaction have been extracted from the level structures of the Λ-hypernuclei. Details of the spin-dependent interactions have been studied by γ-ray spectroscopy with germanium and NaI detectors [6, 7, 8]. One example is the glue-like role of a Λ hyperon in the hypernuclei. Unstable nuclei such as 8Be become stable against the particle decays by adding a Λ hyperon.
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