Nuclear capture at rest of Ξ- hyperons

S. Aoki; S. Y. Bahk; S. H. Chung; H. Funahashi; C. H. Hahn; M. Hanabata; T. Hara; S. Hirata; K. Hoshino; M. Ieiri; T. Iijima; K. Imai; Y. Itow; T. Jin-ya; M. Kazuno; C. O. Kim; J. Y. Kim; S. H. Kim; K. Kodama; T. Kuze; Y. Maeda; A. Masaike; A. Masuoka; Y. Matsuda; A. Matsui; Y. Nagase; C. Nagoshi; M. Nakamura; S. Nakanishi; T. Nakano; K. Nakazawa; K. Niwa; H. Oda; H. Okabe; S. Ono; R. Ozaki; B. D. Park; I. G. Park; K. Sakai; T. Sasaki; Y. Sato; H. Shibuya; H. M. Shimizu; J. S. Song; M. Sugimoto; H. Tajima; H. Takahashi; R. Takashima; F. Takeutchi; K. H. Tanaka; M. Teranaka; I. Tezuka; H. Togawa; T. Tsunemi; M. Ukai; N. Ushida; T. Watanabe; N. Yasuda; J. Yokota; C. S. Yoon

doi:10.1016/j.nuclphysa.2009.07.005

Nuclear capture at rest of Ξ^- hyperons

S. Aoki, S. Y. Bahk, S. H. Chung, H. Funahashi, C. H. Hahn, M. Hanabata, T. Hara, S. Hirata, K. Hoshino, M. Ieiri, T. Iijima, K. Imai, Y. Itow, T. Jin-ya, M. Kazuno, C. O. Kim, J. Y. Kim, S. H. Kim, K. Kodama, T. KuzeY. Maeda, A. Masaike, A. Masuoka, Y. Matsuda, A. Matsui, Y. Nagase, C. Nagoshi, M. Nakamura, S. Nakanishi, T. Nakano, K. Nakazawa, K. Niwa, H. Oda, H. Okabe, S. Ono, R. Ozaki, B. D. Park, I. G. Park, K. Sakai, T. Sasaki, Y. Sato, H. Shibuya, H. M. Shimizu, J. S. Song, M. Sugimoto, H. Tajima, H. Takahashi, R. Takashima, F. Takeutchi, K. H. Tanaka, M. Teranaka, I. Tezuka, H. Togawa, T. Tsunemi, M. Ukai, N. Ushida, T. Watanabe, N. Yasuda, J. Yokota, C. S. Yoon

Research output: Contribution to journal › Article › peer-review

64 Citations (Scopus)

Abstract

An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ^- hyperons produced in the (K^-, K⁺) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ^- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ^--(¹²C, ¹⁴N and ¹⁶O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ^- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ^- capture at rest have been studied.

Original language	English
Pages (from-to)	191-232
Number of pages	42
Journal	Nuclear Physics A
Volume	828
Issue number	3-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2009.07.005
Publication status	Published - 2009 Sep 15
Externally published	Yes

Keywords

C
Hybrid emulsion experiment
N
Nuclear reactions
O(Ξ, X)
binding energies
deduced
double-Λ and twin-Λ hypernuclei production
measured
particle tracks following hypernucleus production
subsequent decay
Ξ capture at rest

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.nuclphysa.2009.07.005

Cite this

Aoki, S., Bahk, S. Y., Chung, S. H., Funahashi, H., Hahn, C. H., Hanabata, M., Hara, T., Hirata, S., Hoshino, K., Ieiri, M., Iijima, T., Imai, K., Itow, Y., Jin-ya, T., Kazuno, M., Kim, C. O., Kim, J. Y., Kim, S. H., Kodama, K., ... Yoon, C. S. (2009). Nuclear capture at rest of Ξ^- hyperons. Nuclear Physics A, 828(3-4), 191-232. https://doi.org/10.1016/j.nuclphysa.2009.07.005

Aoki, S, Bahk, SY, Chung, SH, Funahashi, H, Hahn, CH, Hanabata, M, Hara, T, Hirata, S, Hoshino, K, Ieiri, M, Iijima, T, Imai, K, Itow, Y, Jin-ya, T, Kazuno, M, Kim, CO, Kim, JY, Kim, SH, Kodama, K, Kuze, T, Maeda, Y, Masaike, A, Masuoka, A, Matsuda, Y, Matsui, A, Nagase, Y, Nagoshi, C, Nakamura, M, Nakanishi, S, Nakano, T, Nakazawa, K, Niwa, K, Oda, H, Okabe, H, Ono, S, Ozaki, R, Park, BD, Park, IG, Sakai, K, Sasaki, T, Sato, Y, Shibuya, H, Shimizu, HM, Song, JS, Sugimoto, M, Tajima, H, Takahashi, H, Takashima, R, Takeutchi, F, Tanaka, KH, Teranaka, M, Tezuka, I, Togawa, H, Tsunemi, T, Ukai, M, Ushida, N, Watanabe, T, Yasuda, N, Yokota, J & Yoon, CS 2009, 'Nuclear capture at rest of Ξ^- hyperons', Nuclear Physics A, vol. 828, no. 3-4, pp. 191-232. https://doi.org/10.1016/j.nuclphysa.2009.07.005

@article{f028faf6e08849e1b07ea47bbcbd91b1,

title = "Nuclear capture at rest of Ξ- hyperons",

abstract = "An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ- hyperons produced in the (K-, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ--(12C, 14N and 16O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ- capture at rest have been studied.",

keywords = "C, Hybrid emulsion experiment, N, Nuclear reactions, O(Ξ, X), binding energies, deduced, double-Λ and twin-Λ hypernuclei production, measured, particle tracks following hypernucleus production, subsequent decay, Ξ capture at rest",

author = "S. Aoki and Bahk, {S. Y.} and Chung, {S. H.} and H. Funahashi and Hahn, {C. H.} and M. Hanabata and T. Hara and S. Hirata and K. Hoshino and M. Ieiri and T. Iijima and K. Imai and Y. Itow and T. Jin-ya and M. Kazuno and Kim, {C. O.} and Kim, {J. Y.} and Kim, {S. H.} and K. Kodama and T. Kuze and Y. Maeda and A. Masaike and A. Masuoka and Y. Matsuda and A. Matsui and Y. Nagase and C. Nagoshi and M. Nakamura and S. Nakanishi and T. Nakano and K. Nakazawa and K. Niwa and H. Oda and H. Okabe and S. Ono and R. Ozaki and Park, {B. D.} and Park, {I. G.} and K. Sakai and T. Sasaki and Y. Sato and H. Shibuya and Shimizu, {H. M.} and Song, {J. S.} and M. Sugimoto and H. Tajima and H. Takahashi and R. Takashima and F. Takeutchi and Tanaka, {K. H.} and M. Teranaka and I. Tezuka and H. Togawa and T. Tsunemi and M. Ukai and N. Ushida and T. Watanabe and N. Yasuda and J. Yokota and Yoon, {C. S.}",

note = "Funding Information: We would like to express our thanks to the staff of KEK for their support during the experiment. We also appreciate the support and encouragement provided by professors H. Sugawara, K. Nakai, K. Takamatsu and K. Niu. We are grateful to Professors Y. Akaishi, Y. Yamamoto and T. Yamada for valuable comments. The support for taking pictures using LSM given by Mr. F. Ishidate and his colleagues (Carl Zeiss Co., Ltd.) is greatly acknowledged. The experiment was supported in part by the Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture in Japan; the Korea Research Foundation Grant (KRF-2007-313-C00161), Republic of Korea.",

year = "2009",

month = sep,

day = "15",

doi = "10.1016/j.nuclphysa.2009.07.005",

language = "English",

volume = "828",

pages = "191--232",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

number = "3-4",

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T1 - Nuclear capture at rest of Ξ- hyperons

AU - Aoki, S.

AU - Bahk, S. Y.

AU - Chung, S. H.

AU - Funahashi, H.

AU - Hahn, C. H.

AU - Hanabata, M.

AU - Hara, T.

AU - Hirata, S.

AU - Hoshino, K.

AU - Ieiri, M.

AU - Iijima, T.

AU - Imai, K.

AU - Itow, Y.

AU - Jin-ya, T.

AU - Kazuno, M.

AU - Kim, C. O.

AU - Kim, J. Y.

AU - Kim, S. H.

AU - Kodama, K.

AU - Kuze, T.

AU - Maeda, Y.

AU - Masaike, A.

AU - Masuoka, A.

AU - Matsuda, Y.

AU - Matsui, A.

AU - Nagase, Y.

AU - Nagoshi, C.

AU - Nakamura, M.

AU - Nakanishi, S.

AU - Nakano, T.

AU - Nakazawa, K.

AU - Niwa, K.

AU - Oda, H.

AU - Okabe, H.

AU - Ono, S.

AU - Ozaki, R.

AU - Park, B. D.

AU - Park, I. G.

AU - Sakai, K.

AU - Sasaki, T.

AU - Sato, Y.

AU - Shibuya, H.

AU - Shimizu, H. M.

AU - Song, J. S.

AU - Sugimoto, M.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takashima, R.

AU - Takeutchi, F.

AU - Tanaka, K. H.

AU - Teranaka, M.

AU - Tezuka, I.

AU - Togawa, H.

AU - Tsunemi, T.

AU - Ukai, M.

AU - Ushida, N.

AU - Watanabe, T.

AU - Yasuda, N.

AU - Yokota, J.

AU - Yoon, C. S.

N1 - Funding Information: We would like to express our thanks to the staff of KEK for their support during the experiment. We also appreciate the support and encouragement provided by professors H. Sugawara, K. Nakai, K. Takamatsu and K. Niu. We are grateful to Professors Y. Akaishi, Y. Yamamoto and T. Yamada for valuable comments. The support for taking pictures using LSM given by Mr. F. Ishidate and his colleagues (Carl Zeiss Co., Ltd.) is greatly acknowledged. The experiment was supported in part by the Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture in Japan; the Korea Research Foundation Grant (KRF-2007-313-C00161), Republic of Korea.

PY - 2009/9/15

Y1 - 2009/9/15

N2 - An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ- hyperons produced in the (K-, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ--(12C, 14N and 16O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ- capture at rest have been studied.

AB - An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-Λ hypernuclei and H-dibaryons. More than 10% of Ξ- hyperons produced in the (K-, K+) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of Ξ- hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-Λ hypernuclei. The binding energies of Ξ--(12C, 14N and 16O) states have been estimated for two events which emit twin single-Λ hypernuclei back to back from the capture point. The Σ- p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following Ξ- capture at rest have been studied.

KW - C

KW - Hybrid emulsion experiment

KW - N

KW - Nuclear reactions

KW - O(Ξ, X)

KW - binding energies

KW - deduced

KW - double-Λ and twin-Λ hypernuclei production

KW - measured

KW - particle tracks following hypernucleus production

KW - subsequent decay

KW - Ξ capture at rest

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U2 - 10.1016/j.nuclphysa.2009.07.005

DO - 10.1016/j.nuclphysa.2009.07.005

M3 - Article

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VL - 828

SP - 191

EP - 232

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

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