Measurement of differential cross sections for
elastic scattering in the momentum range 0.44-0.80 GeV/c
Nanamura, Takuya; Fujita, Manami; Hasegawa, Shoichi
; Ichikawa, Masaya; Ichikawa, Yudai
; Imai, Kenichi*; Naruki, Megumi; Sato, Susumu
; Sako, Hiroyuki
; Tamura, Hirokazu; Tanida, Kiyoshi
; Yamamoto, Takeshi
; 59 of others*
We performed a novel
scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400
elastic scattering events were identified from
tagged
particles in the
momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the
elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the
and
channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be
. If the sign of
is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.