Evidence for a neutron skin in N
O.V. Bochkarev1 - L.V. Chulkov1 - P. Egelhof2 - H. Geissel2 - M.S. Golovkov1 - H. Irnich2 - Z. Janas2 - H. Keller2 - T. Kobayashi3 - G. Kraus2 - G. Münzenberg2 - F. Nickel2 - A.A. Ogloblin1 - A. Ozawa3 - A. Piechaczek2 - E. Roeckl2 - W. Schwab2 - K. Sümmerer2 - T. Suzuki3 - I. Tanihata3 - K. Yoshida3
1 Kurchatov Institute, RU-123182 Moscow, Russia
2 Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
3 RIKEN, 2-1 Hirosawa, Wako, Saitama 351-01, Japan
Received: 1 October 1997
Nuclear interaction and charge-changing cross sections were measured for 950 MeV 20N, 20O, 20F, 20Ne, 20Na and 20Mg beams incident on a carbon target. The experimental results are compared to other data, in particular to those obtained for stable nuclei. Root mean square nuclear matter radii and upper limits of root mean square proton radii are derived from the experimental data. Evidence is presented for the existence of a neutron skin in 20N.
21.10.Ft Charge distribution - 27.30.+t