Speaker
Dr
Yudai Ichikawa
(apan Atomic Energy Agency)
Description
We have measured an inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction
at the kaon incident momentum of 1.8 GeV/$c$ at J-PARC K1.8 beam line.
This measurement was carried out as a by-product of a pilot run of the J-PARC E05 experiment, which searched for the $\Xi$-hypernuclei via the $^{12}$C($K^{-}$, $K^+$) reaction.
We have compared the observed missing-mass spectrum with
a DWIA calculation to study the $\bar{K}$-nucleus interaction.
In this comparison, we have changed the depth of both real and imaginary part
of the optical potential between $\bar{K}$ and nucleus.
It is found that the observed spectrum is well reproduced by the
calculation of the potential depth of $V_0 \sim -100$ MeV (real part) and $W_0 \sim -40$ MeV (imaginary part).
On the other hand, we have observed the definitive excess in the deeply bound region $B_{K} > 100 $ MeV, which cannot be explained by the any optical potential.
This excess can be interpreted as a deeply bound $\Lambda(1405)$ nucleus.
In this talk, we will report the detail analysis results of this measurement.
Primary author
Dr
Yudai Ichikawa
(apan Atomic Energy Agency)
