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A study of the proton spectra following the capture of in 6Li and 12C with FINUDA

✍ Scribed by M. Agnello; G. Beer; L. Benussi; M. Bertani; H.C. Bhang; S. Bianco; G. Bonomi; E. Botta; M. Bregant; T. Bressani; S. Bufalino; L. Busso; D. Calvo; P. Camerini; P. Cerello; B. Dalena; F. De Mori; G. D'Erasmo; D. Di Santo; D. Elia; F.L. Fabbri; D. Faso; A. Feliciello; A. Filippi; V. Filippini; R.A. Fini; E.M. Fiore; H. Fujioka; P. Gianotti; N. Grion; O. Hartmann; A. Krasnoperov; V. Lenti; V. Lucherini; V. Manzari; S. Marcello; T. Maruta; N. Mirfakhrai; O. Morra; T. Nagae; A. Olin; H. Outa; E. Pace; M. Pallotta; M. Palomba; A. Pantaleo; A. Panzarasa; V. Paticchio; S. Piano; F. Pompili; R. Rui; G. Simonetti; H. So; V. Tereshchenko; S. Tomassini; A. Toyoda; R. Wheadon; A. Zenoni

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
337 KB
Volume
775
Category
Article
ISSN
0375-9474

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✦ Synopsis

Momenta spectra of protons emitted following the capture of K -in 6 Li and 12 C have been measured with 1% resolution. The 12 C spectrum is smooth whereas for 6 Li a well defined peak appears at about 500 MeV/c. The first observation of a structure in this region was identified as a strange tribaryon or, possibly, a K-nuclear state. The peak is correlated with a Ο€ -coming from Ξ£ -decay in flight, selected by setting the Ο€ momentum larger than 275 MeV/c. The Ξ£ -could be produced, together with a 500 MeV/c proton, by the capture of a K -in a deuteron-cluster substructure of the 6 Li nucleus. The capture rate for such a reaction is (1.62 Β± 0.23 stat +0.71 -0.44 (sys))%/K - stop , in agreement with the existing observations on 4 He targets and with the hypothesis that the 6 Li nucleus can be interpreted as a (d + Ξ±) cluster.

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