H-dibaryon and hypernucleus formation in the Ξ-12C reaction at rest
Physical Review C - Nuclear Physics Volume 62 Issue 5
Page 055201-1-055201-12
published_at 2000-10-02
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| File | |
| Title ( eng ) |
H-dibaryon and hypernucleus formation in the Ξ-12C reaction at rest
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| Creator |
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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| Source Title |
Physical Review C - Nuclear Physics
|
| Volume | 62 |
| Issue | 5 |
| Start Page | 055201-1 |
| End Page | 055201-12 |
| Abstract |
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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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 2000-10-02 |
| Rights |
Copyright (c) 2000 The American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[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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