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New precise measurement of muonium hyperfine structure interval at J-PARC

Ueno, Yasuhiro*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Keiichi*; Ito, Takashi; Iwasaki, Masahiko*; Kadono, Ryosuke*; Kamigaito, Osamu*; Kanda, Sotaro*; Kawall, D.*; Kawamura, Naritoshi*; Koda, Akihiro*; Kojima, Kenji*; Kubo, Kenya*; Matsuda, Yasuyuki*; Mibe, Tsutomu*; Miyake, Yasuhiro*; Mizutani, Takehiro*; Nagamine, Kanetada*; Nishiyama, Kusuo*; Ogitsu, Toru*; Okubo, Ryuji*; Saito, Naoto*; Sasaki, Kenichi*; Shimomura, Koichiro*; Strasser, P.*; Sugano, Michinaka*; Tajima, Minori*; Tanaka, Kazuo*; Tomono, Dai*; Torii, Hiroyuki*; Torikai, Eiko*; Toyoda, Akihisa*; Ueno, Akira*; Yamamoto, Akira*; Yoshida, Mitsuhiro*

MuSEUM is an international collaboration aiming at a new precise measurement of the muonium hyperfine structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty.

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