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Neutron radii of the calcium isotopes

1992; American Institute of Physics; Volume: 46; Issue: 5 Linguagem: Inglês

10.1103/physrevc.46.1825

1538-4497

W. R. Gibbs, J.-P. Dedonder,

Quantum Chromodynamics and Particle Interactions

We have analyzed pion scattering data to determine the proton and neutron radii of the calcium isotopes $^{40,42,44,48}\mathrm{Ca}$ using model densities in which the neutron matter distributions are considered to have components corresponding to core and valence neutrons. The proton radii determined agree with those obtained by electromagnetic means. The radii of the valence distributions show a monotonic decrease throughout the shell from \ensuremath{\sim}4.9 fm in $^{42}\mathrm{Ca}$ to \ensuremath{\sim}4.4 fm in $^{44}\mathrm{Ca}$ and \ensuremath{\sim}4.2 fm in $^{48}\mathrm{Ca}$, although this last case is only indicative. The large valence neutron radius of $^{42}\mathrm{Ca}$ suggests that the ground state of this nucleus may have some characteristics of a bound dineutron orbiting a closed core.