Interaction cross section study of the two-neutron halo nucleus $^{22}$C
Résumé
The interaction cross sections (σI) of the very neutron-rich carbon isotopes 19C, 20C and 22C have been measured on a carbon target at 307, 280, and 235MeV/nucleon, respectively. A σIof 1.280 ±0.023bwas obtained for 22C, significantly larger than for 19,20C, supporting the halo character of 22C. A 22C root-mean-squared matter radius of 3.44 ±0.08fmwas deduced using a four-body Glauber reaction model. This value is smaller than an earlier estimate (of 5.4 ±0.9fm) derived from a σImeasurement on a hydrogen target at 40MeV/nucleon. These new, higher-precision σIdata provide stronger constraints for assessing the consistency of theories describing weakly bound nuclei.
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