Production of twin Λ-hypernuclei from Ξ− hyperon capture at rest

Ichikawa, A. K.; Ahn, J. K.; Akikawa, H.; Aoki, Shigeki; Arai, K.; Bahk, S. Y.; Baik, K. M.; Bassalleck, B.; Chung, M.; Hoshino, K.; Ieiri, M.; Iwata, Yoshiyuki; Kanda, H.; Kaneko, M.; Kawai, Takeshi; Kim, C.O.; Kim, J.Y.; Kim, S.J.; Kim, S.H.; Kondō, Y.; Kouketsu, T.; Lee, Y.L.; McNabb, J. W.; Mitsuhara, Manabu; Nagase, Y.; Nagoshi, C.; Nakazawa, Kimitaka; Noumi, H.; Ogawa, S.; Okabe, H.; Oyama, K.; Park, H.M.; Park, I.G.; Parker, Joseph D.; Ra, Y.; Rhee, J. T.; Rusek, A.; Shibuya, H.; Sim, K. S.; Saha, Pranab; Seki, Daikichi; Sekimoto, M.; Song, J.; Takahashi, Hajime; Takahashi, T.; Takéutchi, F.; Tanaka, Hiroki; Tanida, K.; Tojo, J.; Torii, H.; Torikai, S.; Ushida, N.; Yamamoto, K.; Yasuda, N.; Yang, Jing; Yoon, C. J.; Yosoi, M.; Yoshida, T.; Zhu, Lei

doi:10.1016/s0370-2693(01)00049-1

Cited by 26 publications

(8 citation statements)

References 19 publications

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“…More details of the E373 and the E07 experiments are given in Ref. [20,39] and Ref. [40,41], respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…2, could not be precisely determined in the usual way, from the top view, because the tracks of the two single Λ hypernuclei overlapped with the Ξ − hyperon track in the optical axis direction. Therefore, the method of viewing the event from the side was used, which has also been done in past event analysis [39]. Figure 3 shows a microscope photo when the thinly sliced emulsion sheet was observed from the side.…”

Section: E373-t3 (Kinka) Eventmentioning

confidence: 99%

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First observation of a nuclear $s$-state of $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$

Yoshimoto,

Ahn,

Bassalleck

et al. 2021

Preprint

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In the E07 experiment at J-PARC, we observed an extremely deep Ξ − -14 N bound-system via Ξ − capture at rest followed by a decay into a twin single-Λ hypernucleus in nuclear emulsion detectors. The decay mode of the system was determined as 5 Λ He + 5 Λ He + 4 He + n. Since there are no excited state for daughter particles, the binding energy of Ξ − hyperon, B Ξ − , in 14 N nucleus was uniquely determined to be 6.27 ± 0.27 MeV for the one event. By reanalysis of the past E373 experiment at KEK-PS, we obtained another Ξ − -14 N system having a B Ξ − value, 8.00 ± 0.77 MeV or 4.96 ± 0.77 MeV, via the decay 9 Λ Be + 5 Λ He + n, where the two possible values of B Ξ − correspond to the ground and the excited state of the daughter 9 Λ Be nucleus, respectively. Since the B Ξ − values are larger than those of the previously reported events (KISO and IBUKI) interpreted as the nuclear 1p state of Ξ − -14 N system, these two events give the first indication of the nuclear 1s state of Ξ hypernucleus, 15 Ξ C.

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“…More details of the E373 and the E07 experiments are given in Ref. [20,39] and Ref. [40,41], respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: E373-t3 (Kinka) Eventmentioning

confidence: 99%

First observation of a nuclear $s$-state of $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$

Yoshimoto,

Ahn,

Bassalleck

et al. 2021

Preprint

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“…The set up was almost similar to the one used at KEK-PS E373 experiment and detail of the experimental setup is described elsewhere [34].…”

Section: Methodsmentioning

confidence: 99%

Search for Θ+ via π−p→K−X reaction near production threshold

Miwa¹,

Ahn²,

Aoki³

et al. 2006

Physics Letters B

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We have searched for Θ + via π − p → K − X reaction using 1.87 and 1.92 GeV/c π − beam at the K2 beam line of the KEK 12 GeV Proton Synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c 2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5−2.7σ. Therefore we have derived the upper limit of Θ + production cross section via π − p → K − Θ + reaction which is 3.9µb at 90% confidence level assuming that Θ + is produced isotropically in the center of mass system.

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“…It was about 30 years after the first observation of DLH [5]. In E373, seven DLH events [6][7][8] and several events of TLH were detected [9]. One of these events, "NAGARA", was identified as 6 ΛΛ He and the ΛΛ interaction turned out to be a weak attractive force.…”

Section: Previous Experiments Kek-ps E176 and E373mentioning

confidence: 99%

“…On the other hand, the others around 6 MeV suggests the deeper state, possibly the 1S state. [9] and TLH #002 are candidates of Ξ − hyperatom. KISO [11] and IBUKI [17] are XH candidates that have been reported so far.…”

Section: Double Strangeness Eventsmentioning

confidence: 99%

J-PARC E07: Systematic Study of Double Strangeness System with Hybrid Emulsion Method

Yoshida

Agari

Ahn

et al. 2021

Proceedings of the 3rd J-Parc Symposium (J-Parc2019)

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J-PARC E07 is the most ambitious and complex emulsion experiment to date investigating double hypernuclei with Hybrid emulsion method. The physics run at the K1.8 beam line in the J-PARC hadron experimental facility have been completed in 2017. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics are estimated to be more 3 times than that of previous experiments. Quantitative data on the ΛΛ and ΞN interaction are being accumulated successfully via analysis of double Λ and Ξ hypernuclei. Multiple Ξ hypernucleus candidates suggests several features about Ξ hypernucleus that the identification efficiency of 15 Ξ C is significantly higher than other mode, many daughters of 15 Ξ C are identified as He or Be, and multiple bound states of Ξ − exist in the 14 N nucleus. An analysis of X-ray spectroscopy of Ξ − hyperatoms are onging.

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Production of twin Λ-hypernuclei from Ξ− hyperon capture at rest

Cited by 26 publications

References 19 publications

First observation of a nuclear $s$-state of $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$

First observation of a nuclear $s$-state of $Ξ$ hypernucleus, $^{15}_Ξ{\rm C}$

Search for Θ+ via π−p→K−X reaction near production threshold

J-PARC E07: Systematic Study of Double Strangeness System with Hybrid Emulsion Method

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