Wednesday, April 24, 2013

1304.6220 (B. M. Abramov et al.)

Quark cluster contribution to cumulative proton emission in
fragmentation of carbon ions

B. M. Abramov, P. N. Alekseev, Yu. A. Borodin, S. A. Bulychjov, I. A. Dukhovskoy, A. I. Khanov, A. P. Krutenkova, V. V. Kulikov, M. A. Martemyanov, M. A. Matsyuk, E. N. Turdakina
In the FRAGM experiment at heavy ion accelerator complex TWAC-ITEP, the proton yields at an angle 3.5$^\circ$ have been measured at fragmentation of carbon ions at $T_0 = $ 0.6, 0.95 and 2.0 GeV/nucleon on beryllium target. The data are presented as invariant proton yields on cumulative variable $x$ in the range 0.9 < $x$ < 2.4. Proton spectra cover six orders of invariant cross section magnitude. They have been analyzed in the framework of quark cluster fragmentation model. Fragmentation functions of quark-gluon string model are used. The probabilities of the existence of multi-quark clusters in carbon nuclei are estimated to be 8--12% for six-quark clusters and 0.2--0.6% for nine-quark clusters.
View original:

No comments:

Post a Comment