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$First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction$

First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction

by Choi, Sung Wook , Tanida, Kiyoshi , Ishikawa, Yuji , Hasegawa, Shoichi , Woo, Seung Jung , Harada, Takeshi , Hayakawa, Shuhei , Saito, Masayoshi , Fujita, Manami , Ahn, Jung Keun , Sakao, Tamao , Imai, Kenichi , Wada, Shunsuke , Yamagata-Sekihara, Junko , Sako, Hiroyuki , Yamamoto, Takeshi O , Tamura, Hirokazu , Sato, Susumu , Morino, Taito , Hirenzaki, Satoru , Yang, Seongbae , Ichikawa, Yudai , Kamada, Kento , Kajikawa, Shunsuke , Lee, Jaeyong , Hwang, Sang Hoon , Ukai, Mifuyu , Lee, Jong Won , Shin Hyung Kim , Oura, Fumiya , Takahashi, Toshiyuki , Miwa, Koji , Kitaoka, Tomomasa , Kang, Byung Min , Hicks, Kenneth

in Cross-sections / Nucleons

2026

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First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction

in Cross-sections / Nucleons

2026

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$First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction$

First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction

in Cross-sections / Nucleons

2026

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$First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction$

Paper

First Measurement of the \$K^-\$ Escape Cross Section in the \$^12 C(K^-,p)\$ Reaction

Choi, Sung Wook,

Tanida, Kiyoshi,

Ishikawa, Yuji,

Hasegawa, Shoichi,

Woo, Seung Jung,

Harada, Takeshi,

Hayakawa, Shuhei,

Saito, Masayoshi,

Fujita, Manami,

Ahn, Jung Keun,

Sakao, Tamao,

Imai, Kenichi,

Wada, Shunsuke,

Yamagata-Sekihara, Junko,

Sako, Hiroyuki,

Yamamoto, Takeshi O,

Tamura, Hirokazu,

Sato, Susumu,

Morino, Taito,

Hirenzaki, Satoru,

Yang, Seongbae,

Ichikawa, Yudai,

Kamada, Kento,

Kajikawa, Shunsuke,

Lee, Jaeyong,

Hwang, Sang Hoon,

Ukai, Mifuyu,

Lee, Jong Won,

Shin Hyung Kim,

Oura, Fumiya,

Takahashi, Toshiyuki,

Miwa, Koji,

Kitaoka, Tomomasa,

Kang, Byung Min,

Hicks, Kenneth

2026

Overview

We investigated the \$K\$-nucleus interaction through the simultaneous measurement of the inclusive \$^12 C(K^-, p)\$ and exclusive \$K^-\$-escape \$^12 C(K^-, p K^-_esc)\$ reactions at \$1.8\$ GeV/\$c\$ at J-PARC. The present measurement explicitly focuses on the \$K^-\$ escape process for the first time, successfully accomplishing a direct experimental determination of the imaginary part of the \$K^-\$ optical potential. The differential cross section for the \$K^-\$-escape reaction was determined to be \$436 6\\:(stat.) 44\\:(syst.)~/sr\$. A simultaneous likelihood fit yielded real and imaginary potential strengths of \$V_0 = -72\\:^+3_-5\\:(stat.)\\:^+0_-8\\:(syst.)~MeV\$ and \$W_0 = -100\\:^+7_-1\\:(stat.)\\:^+0_-16\\:(syst.)~MeV\$ at the nuclear center, respectively. The derived \$W_0\$ is significantly stronger than that predicted by theoretical models based on one-nucleon processes, suggesting possible contribution of multi-nucleon involving processes.

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Publisher

Cornell University Library, arXiv.org

Subject

Cross-sections

/ Nucleons