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6 results on '"N Ushida"'

1. Nuclear capture at rest of Ξ− hyperons

Author

C.H. Hahn, A. Masuoka, Kenichi Imai, Y. Nagase, N. Yasuda, M. Ukai, Kimio Niwa, J. S. Song, C. S. Yoon, Yoshihiro Sato, H. Okabe, Saewoong Bahk, Yoshitaka Itow, I. G. Park, Takashi Z. Nakano, Kazuhiro Tanaka, T. Kuze, Ryuichi Takashima, Seok Kim, H. Funahashi, Yasuyuki Matsuda, A. Matsui, N. Ushida, S. H. Chung, C. O. Kim, Kazuma Nakazawa, J. Y. Kim, H. Tajima, K. Kodama, H. Togawa, C. Nagoshi, Y. Maeda, R. Ozaki, T. Tsunemi, K. Sakai, Hirotaka Takahashi, M. Nakamura, Akira Masaike, B. D. Park, K. Hoshino, H. Oda, T. Jin-ya, M. Hanabata, I. Tezuka, Fujio Takeutchi, T. Iijima, M. Sugimoto, S. Hirata, T. Sasaki, H. Shibuya, T. Hara, J. Yokota, Hajime Shimizu, Masaharu Ieiri, Shigeki Aoki, Takashi Watanabe, S. Ono, S. Nakanishi, M. Kazuno, and M. Teranaka

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle decay, Meson, Branching fraction, Nuclear emulsion, Strangeness, Atomic physics, Sigma baryon, Xi baryon
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 − -( 12 C, 14 N and 16 O) 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.

Published
2009

2. Observation of double-hypernuclei and Λ-Λ interaction

Author

H. Takahashi, J.K. Ahn, H. Akikawa, S. Aoki, K. Arai, S.Y. Bahk, K.M. Baik, B. Bassalleck, J.H. Chung, M.S. Chung, D.H. Davis, T. Fukuda, K. Hoshino, A. Ichikawa, M. Ieiri, K. Imai, Y.H. Iwata, Y.S. Iwata, H. Kanda, M. Kaneko, T. Kawai, M. Kawasaki, C.O. Kim, J.Y. Kim, S.H. Kim, Y. Kondo, T. Kouketsu, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, M. Okuda, K. Oyama, B.D. Park, H.M. Park, I.G. Park, J. Parker, Y.S. Ra, J.T. Rhee, A. Rusek, H. Shibuya, K.S. Sim, P.K. Saha, D. Seki, M. Sekimoto, J.S. Song, T. Takahashi, F. Takeutchi, H. Tanaka, K. Tanida, J. Tojo, H. Torii, S. Torikai, D.N. Tovee, N. Ushida, T. Wint, K. Yamamoto, N. Yasuda, J.T. Yang, C.J. Yoon, C.S. Yoon, M. Yosoi, T. Yoshida, and L. Zhu

Subjects
Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Branching fraction, Hadron, Hyperon, Elementary particle, Fermion, Lambda baryon
Abstract

A hybrid-emulsion experiment has been carried out at KEK-PS to study S = −2 nuclei. With the analysis of about 35% of total emulsion, we have successfully found three events of sequential weak decay of a double-hypernucleus. The results of these E373 events are summarized together with those of past experiments. The first experimental study of the branching ratios of weak decay modes of double-hypernuclei has been performed.

Published
2003

3. Study of double-strangeness nuclei with hybrid-emulsion method (KEK-PS E373)

Author

K. Oyama, T. Kouketsu, B. Bassalleck, J. Parker, I. G. Park, C. O. Kim, H. Takahashi, Tomoko Yoshida, J. S. Song, N. Ushida, S. Ogawa, K. Hoshino, H. Akikawa, Toshiyuki Takahashi, K. Arai, H. Kanda, J.T. Yang, L. H. Zhu, J. K. Ahn, Michiko Sekimoto, Shigeki Aoki, Y. S. Iwata, Junji Tojo, Y. Nagase, S. J. Kim, Y. H. Iwata, J. Y. Kim, J. H. Chung, H. M. Park, H. Torii, Y. L. Lee, H. Okabe, J. W C McNabb, Atsushi Ichikawa, N. Yasuda, M. Mitsuhara, A. Rusek, Kwang Souk Sim, Y. S. Ra, T. Kawai, K. Imai, H. Tanaka, Saewoong Bahk, K. M. Baik, Fujio Takeutchi, M. Kaneko, Kazuhiro Yamamoto, Seok Kim, P. K. Saha, C.J. Yoon, D. Seki, C. S. Yoon, H. Shibuya, Y. Kondo, K. Tanida, J. T. Rhee, Masaharu Ieiri, M. S. Chung, S. Torikai, M. Yosoi, Hiroyuki Noumi, Kazuma Nakazawa, and C. Nagoshi

Subjects
Physics, Nuclear and High Energy Physics, Optics, Scintillating fiber, Spectrometer, business.industry, Track (disk drive), Detector, Emulsion, Nuclear emulsion, Strangeness, business
Abstract

An experiment to search for double-strangeness nuclei in nuclear emulsion is now being carried on as KEK-PS E373. Preliminary results of the data analysis for the K + spectrometer and the scintillating fiber detectors are presented. Status of the automatic track finding method for the emulsion is reported.

Published
2001

4. Study of double-strangeness nuclei with hybrid-emulsion method (KEK-PS E373)

Author

A. Ichikawa, J.K. Ahn, Y. Akaishi, H. Akikawa, S. Aoki, S.Y. Bahk, K.M. Baik, M.S. Chung, T. Fukuda, K. Hoshino, M. Ieiri, K. Imai, Y. Iwata, H. Kanda, M. Kaneko, T. Kawai, C.O. Kim, J.Y. Kim, S.J. Kim, Y. Kondo, T. Motoba, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, H.M. Park, I.G. Park, Y.S. Ra, J.T. Rhee, M. Sekimoto, H. Shibuya, K.S. Sim, J.S. Song, H. Takahashi, T. Takahashi, F. Takeutchi, H. Tanaka, J. Tojo, H. Torii, S. Torikai, N. Ushida, K. Yamamoto, Y. Yamamoto, J.T. Yang, N. Yasuda, C.J. Yoon, T. Yoshida, and Y. Yosoi

Subjects
Nuclear and High Energy Physics
Published
2000

5. Quasifree p(K, K)Ξ reaction in nuclear emulsion

Author

T. Hara, I. Tezuka, M. Nakamura, I. G. Park, Saewoong Bahk, R. Ozaki, Y. Maeda, S. Nakanishi, T. Kuze, R. Tanaka, C. O. Kim, T. Iijima, Fujio Takeutchi, Yoshihiro Sato, Ryuichi Takashima, M. S. Park, A. Matsui, N. Ushida, H. Okabe, Y.B. Sim, S. Asai, K. Imai, H. Funahashi, J. Yokota, H. Togawa, K. Murakami, K. Hoshino, J. Y. Kim, Masaharu Ieiri, K. Sakai, C.H. Hahn, T. Jin-ya, Koichi Kodama, S. H. Chung, M. Iida, S. Ono, H. Shibuya, M. Hanabata, Hajime Shimizu, Yasuyuki Matsuda, T. Sasaki, N. Yasuda, C. Nagoshi, C. S. Yoon, Shigeki Aoki, Kimio Niwa, D. C. Kim, J. S. Song, Yoshitaka Itow, Takashi Z. Nakano, M. Kazuno, Kazuma Nakazawa, S. Ogawa, H. Tajima, Akira Masaike, M. Sugimoto, M. Teranaka, C.J. Yoon, and Kazuhiro Tanaka

Subjects
Physics, Nuclear reaction, Nuclear physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Mean free path, medicine, Analytical chemistry, Nuclear emulsion, Nuclear matter, Nucleus, Vertex (geometry)
Abstract

A study of 1.66 GeV c K − beam induced ( K − ,K + ) reactions in the nuclear emulsion target is presented and 796 ( K − , K + ) reaction vertices ( p K + ⩾ 1 GeV /c ) containing 18 single hyperfragments are identified. There is no clear(spatially separated) double hyperfragment nor twin single hyperfragment in the identified 796 ( K − ,K + ) reactions. These events are classified and their characteristics are described in detail. In the region p K + ⩾ 1 GeV /c where the quasifree K − (p) → K + Ξ − is the dominant process, the probability of Ξ − emission from the reaction vertex is determined to be 73.9 −4.6 +4.5 %. From this value, the mean free path of Ξ − in a nucleus is estimated to be 4.7 −1.0 +1.5 fm for 〈p Ξ − 〉 ∼ 0.6 GeV /c by assuming a simple model of uniform nuclear matter.

Published
1998

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