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ID 19322
本文ファイル
著者
KEK-PS E224 Collaboration
Ahn, J.K.
Aoki, S.
Chung, K. S.
Chung, M. S.
En'yo, H.
Fukuda, T.
Funahashi, H.
Goto, Y.
Higashi, A.
Ieiri, M.
Iijima, T.
Imai, K.
Itow, Y.
Lee, J. M.
Makino, S.
Masaike, A.
Matsuda, Y.
Matsuyama, Y.
Mihara, S.
Nagoshi, C.
Nomura, I.
Park, I. S.
Saito, N.
Sekimoto, M.
Shin, Y. M.
Sim, K. S.
Susukita, R.
Takashima, R.
Takeutchi, F.
Tlustý, P.
Weibe, S.
Yokkaichi, S.
Yoshida, K.
Yoshida, M.
Yoshida, T.
Yamashita, S.
抄録(英)
Stopped-Ξ-12C reactions have been investigated with respect to H-dibaryon and hypernucleus formation with a scintillating fiber detector. Out of 5.5×103 tagged Ξ- particles via the (K-,K+) reaction we obtained 72 stopping Ξ- events with 6.7+1.1-1.4 background events after imposing kinematic constraints. Hypernuclear production has been studied by observing free Λ decays in the stopped-Ξ- reactions. From the observed Λ momentum spectrum, we have found the hypernuclear production rates to be 18±13, 65±6, and 17±12 % for double/twin-A hypernucleus, single-Λ hypernucleus, and no hypernucleus cases, respectively. With the same sample, we set upper limits on R (stopped-Ξ-12C→HX /stopped-Ξ-12C→ all) for H decaying into Λn, Σ-p, and Λpπ-, for H masses just below ΛΛ mass threshold and for H lifetime range 10-11≤τH≤10-8 s. The upper limits on R are ∼0.1-0.2, assuming all of the H decay into each decay mode. Our results give a tight constraint on the existence of the bound H, in comparison with the theoretical estimates of Aerts and Dover, albeit with different target nuclei.
掲載誌名
Physical Review C - Nuclear Physics
62巻
5号
開始ページ
055201-1
終了ページ
055201-12
出版年月日
2000-10-02
出版者
American Physical Society
ISSN
0556-2813
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
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権利情報
Copyright (c) 2000 The American Physical Society.
関連情報URL
部局名
先端物質科学研究科