Abstract
The charge-changing cross sections of 7,9-12,14Be have been measured at 900AMeV 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}{\rm Be} is determined for the first time to be 2.41 \pm 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.
Highlights
The nucleon distribution radii of unstable nuclei can be determined by several methods such as interaction cross sections [1,2] or reaction cross sections with light targets [2,3,4], and proton elastic scattering [5,6]
The proton radii of neutron-rich nuclei have previously been determined from the rms charge radii of the nuclei
The isotope shifts are dominated by the mass shifts, which are not related to the radii
Summary
The nucleon distribution radii of unstable nuclei can be determined by several methods such as interaction cross sections [1,2] (σI) or reaction cross sections (σR) with light targets [2,3,4], and proton elastic scattering [5,6]. The charge-changing cross sections σcc, when they are dominated by geometrical conditions similar to σI, carry information about the proton distribution and proton radii [20]. The proton radii of 9−10Be, 14−16C, and 16−18O isotopes have been determined by Yamaguchi et al from σcc using an empirical scaling law [21].
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