Spectroscopic study of $¥Xi$ hypernucleus by using the $^{12}{¥rm C}(K^{-},K^{+})$ reaction at J-PARC
ORAL
Abstract
We have measured an excitation energy spectrum of the $^{12}{¥rm C}(K^{-},K^{+})$ reaction at J-PARC K1.8 beam line.
First the production rates of $¥Xi^{-}$ were measured through the $p(K^{−},K^{+})$ reaction at 1.5--1.9 GeV/$c$, and found to be maximum at 1.8 GeV/$c$.
Then we irradiated $78.6¥times 10^{9}~K^{-}$s at 1.8 GeV/$c$ on the carbon target to search for a $¥Xi^{-}$ bound state.
An energy resolution was 6 MeV (FWHM) which is the best ever achieved in the past experiments using this reaction.
As the results of the experiment, the hypernuclear spectrum shows a significant excess in the bound region.
The spread of the events is much broader than the energy resolution and expected conversion width of Ξ hypernucleus, and at least two $¥Xi^{-}$ bound states are expected to exist around $B_{¥Xi} = 9$ and 2 MeV.
We will report the result of this experiment and discuss the recent baryon-baryon interaction models.
First the production rates of $¥Xi^{-}$ were measured through the $p(K^{−},K^{+})$ reaction at 1.5--1.9 GeV/$c$, and found to be maximum at 1.8 GeV/$c$.
Then we irradiated $78.6¥times 10^{9}~K^{-}$s at 1.8 GeV/$c$ on the carbon target to search for a $¥Xi^{-}$ bound state.
An energy resolution was 6 MeV (FWHM) which is the best ever achieved in the past experiments using this reaction.
As the results of the experiment, the hypernuclear spectrum shows a significant excess in the bound region.
The spread of the events is much broader than the energy resolution and expected conversion width of Ξ hypernucleus, and at least two $¥Xi^{-}$ bound states are expected to exist around $B_{¥Xi} = 9$ and 2 MeV.
We will report the result of this experiment and discuss the recent baryon-baryon interaction models.
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Presenters
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Shunsuke Kanatsuki
Kyoto University
Authors
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Shunsuke Kanatsuki
Kyoto University