Nuclear radii of 17,19B and 14Be Original Research Article

The interaction cross sections (σI) of light radioactive nuclei close to the neutron drip line (17,19B, 14Be) have been measured at around 800A MeV. The effective root-mean-square (r.m.s.) matter radii of these nuclei have been deduced from σI by two different methods, a Glauber-type calculation based on the optical limit approximation and a few-body reaction model. The deduced radii from both approaches agree with each other within experimental uncertainty. The r.m.s. radii of 17B (2.99±0.09 fm) and of 14Be (3.10±0.15 fm) in this work are consistent with the previously determined values, and have a higher accuracy. The r.m.s. radius of 19B (3.11±0.13 fm) was newly determined. Assuming a “core plus 2n” structure in 17B and 14Be, the mixing of ν(2s1/2) and ν(1d5/2) was studied and the s-wave spectroscopic factor is found to be 36±19% and 47±25%, respectively. A valence radius analysis suggests a “core plus 4n” structure in 19B.