1304.6220 (B. M. Abramov et al.)

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

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: http://arxiv.org/abs/1304.6220