H-dibaryon and hypernucleus formation in the Ξ-12C reaction at rest
Physical Review C - Nuclear Physics 62 巻 5 号
055201-1-055201-12 頁
2000-10-02 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
H-dibaryon and hypernucleus formation in the Ξ-12C reaction at rest
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| 作成者 |
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.
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| 収録物名 |
Physical Review C - Nuclear Physics
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| 巻 | 62 |
| 号 | 5 |
| 開始ページ | 055201-1 |
| 終了ページ | 055201-12 |
| 抄録 |
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.
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
American Physical Society
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| 発行日 | 2000-10-02 |
| 権利情報 |
Copyright (c) 2000 The American Physical Society.
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 0556-2813
[DOI] 10.1103/PhysRevC.62.055201
[NCID] AA00773613
[DOI] http://dx.doi.org/10.1103/PhysRevC.62.055201
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