Double-Λhypernuclei observed in a hybrid emulsion experiment

Autor: A. K. Ichikawa, M. Sekimoto, M. Kawasaki, K. Hoshino, Seok Kim, Toshiyuki Takahashi, H. Kanda, Koji Yamamoto, B. Bassalleck, I. G. Park, N. Ushida, K. S. Sim, P. K. Saha, Kenichi Imai, C. S. Yoon, M. S. Chung, H. Okabe, H. N. Kyaw, D. Seki, T. Kouketsu, T. Wint, Hirotaka Takahashi, D.N. Tovee, Y. S. Ra, Junji Tojo, Y. Nagase, Fujio Takeutchi, J. Y. Kim, J. W C McNabb, A. Sawa, S. J. Kim, Saewoong Bahk, H. Shibuya, Tomokazu Fukuda, C. J. Yoon, H. M. Park, H. Akikawa, K. Oyama, Takayoshi Kawai, C. Nagoshi, N. Yasuda, Adam Rusek, Y. Kondo, M. Kaneko, J. K. Ahn, S. Ogawa, Y. Nakanishi, J. S. Song, Masaharu Ieiri, J. T. Yang, K. Miwa, K. Itonaga, D. H. Davis, L. H. Zhu, J. T. Rhee, H. Tanaka, Shigeki Aoki, K. Tanida, T. Tsunemi, Kazuma Nakazawa, K. T. Tint, C. O. Kim, Y. S. Iwata, B. D. Park, K. M. Baik, J. H. Chung, J. Parker, M. Mitsuhara, Tomoko Yoshida, Y. L. Lee, S. Torikai, M. Yosoi, Hiroyuki Noumi, H. Torii, K. Arai, Y. H. Iwata, A. A. Min, M. Ukai
Rok vydání: 2013
Předmět:
Zdroj: Physical Review C. 88
ISSN: 1089-490X
0556-2813
Popis: A hybrid experiment with nuclear emulsion and scintillating-fiber detectors (KEK-E373) has been performed to search for double-strangeness systems. Among about 10${}^{3}$ events of ${\ensuremath{\Xi}}^{\ensuremath{-}}$ hyperons captured at rest by emulsion nuclei, we have observed four events which clearly show the topology of cascade weak decays of double-$\ensuremath{\Lambda}$ hypernuclei including the ``Nagara'' event. Regarding the Nagara event, values of the two-$\ensuremath{\Lambda}$ binding energy (${B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$) and the $\ensuremath{\Lambda}$-$\ensuremath{\Lambda}$ interaction energy ($\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$) of ${}_{\ensuremath{\Lambda}}^{}{}_{\ensuremath{\Lambda}}^{6}\mathrm{He}$ have been revised to 6.91 $\ifmmode\pm\else\textpm\fi{}$ 0.16 and 0.67 $\ifmmode\pm\else\textpm\fi{}$ 0.17 MeV, respectively, due to the recent change of the ${\ensuremath{\Xi}}^{\ensuremath{-}}$ mass value (Particle Data Group). For another three events, we have determined possible species of double-$\ensuremath{\Lambda}$ hypernuclei together with their binding energies.
Databáze: OpenAIRE
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