Proton radius of 14Be from measurement of charge-changing cross sections

Abstract

The charge-changing cross sections of 7,9-12,14 Be have been measured at 900A MeV on a carbon target. These cross sections are discussed both in terms of a geometrical and a Glauber model. From several different analyses of the cross sections, the proton distribution radius (proton radius) of 14 Be is determined for the first time to be 2.41 0.04 fm. A large difference in the proton and neutron radii is found. The proton radii are compared to the results of fermionic molecular dynamics (FMD) and antisymmetrized molecular dynamics (AMD) calculations.