Search for superfragments and measurement of the production of hyperfragments in neutrino–nucleus interactions

G. Önengüt,R. van Dantzig,M. de Jong,R.G.C. Oldeman,M. Güler,U. Köse,P. Tolun,M.G. Catanesi,M.T. Muciaccia,K. Winter,B. Van de Vyver,P. Vilain,G. Wilquet,B. Saitta,E. Di Capua,S. Ogawa,H. Shibuya, I.R. Hristova,A. Kayis-Topaksu,T. Kawamura,D. Kolev,H. Meinhard,J. Panman,A. Rozanov,R. Tsenov,J.W.E. Uiterwijk,P. Zucchelli,J. Goldberg,M. Chikawa,J.S. Song, C.S. Yoon,K. Kodama,N. Ushida,S. Aoki,T. Hara,T. Delbar,D. Favart,G. Grégoire,S. Kalinin,I. Makhlioueva, A. Artamonov,P. Gorbunov,V. Khovansky,V. Shamanov,I. Tsukerman,N. Bruski, D. Frekers,K. Hoshino,J. Kawada,M. Komatsu,M. Miyanishi,M. Nakamura,T. Nakano,K. Narita,K. Niu, K. Niwa,N. Nonaka,O. Sato,T. Toshito, S. Buontempo,A.G. Cocco,N. D'Ambrosio,G. De Lellis,G. De Rosa,F. Di Capua,G. Fiorillo,A. Marotta,M. Messina,P. Migliozzi,L. Scotto Lavina,P. Strolin,V. Tioukov,T. Okusawa,U. Dore,P.F. Loverre,L. Ludovici,G. Rosa,R. Santacesaria,A. Satta,F.R. Spada,E. Barbuto,C. Bozza,G. Grella,G. Romano,C. Sirignano,S. Sorrentino,Y. Sato,I. Tezuka

NUCLEAR PHYSICS B（2005）

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摘要

A systematic search for superfragments (charmed nuclei) has been performed in 22 200 neutrinoemulsion interactions obtained with the CHORUS experiment making use of automatic off-line image analysis. The absence of candidates provides an upper limit for the superfragment production rate of 1.9 x 10(-4) (90% C.L.) relative to neutrino charged-current interactions at an average neutrino energy of 27 GeV. In the same analysis 28 hyperfragment decays were found. For the first time, a production rate of hyperfragments in neutrino-emulsion interactions was obtained. The value of the hyperfragment production rate relative to the neutrino charged-current cross-section was found to be (2.0 +/- 0.4(stat) +/- 0.3 (syst)) x 10(-3). (c) 2005 Elsevier B.V. All rights reserved.

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